-
Frank Stefani (Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, D-01328 Dresden, Germany)09/06/2026, 12:00Poster
We present a solar dynamo model that appears capable of explaining various periodicities across a wide range of timescales in a self-consistent manner [1]. Starting with Rieger-type periodicities, we demonstrate that the two-planet spring tides of Venus, Earth, and Jupiter can excite magneto-Rossby waves in the solar tachocline. These waves have typical periods ranging from 100 to 300 days,...
Go to contribution page -
Laurie Lamy-Proulx (Universitรฉ de Montrรฉal, Montrรฉal, Canada)09/06/2026, 12:01Poster
The magnetohydrodynamic dynamo effect, which governs the interactions between internal solar fluid flows and magnetic fields, drives the Sunโs 11-year activity cycle. The meridional circulation, a key aspect of this process, plays a crucial role in regulating the solar cycle and its large-scale magnetic field, particularly within the framework of flux transport dynamo models. However, the deep...
Go to contribution page -
Zebin Zhang (Institute of Frontier and Interdisciplinary Science and Institute of Space Sciences, Shandong University, People's Republic of China)09/06/2026, 12:02Poster
As the solar magnetic cycle evolves, subsurface toroidal magnetic flux is systematically generated and lost, and this work aims to identify the dominant process behind the flux loss. By employing a data-driven dynamo model and holding surface magnetic flux transport identical across the cycles 12-21, we conducted numerical experiments to isolate and assess the loss of subsurface toroidal flux,...
Go to contribution page -
Emilia Rintamรคki (Department of Physics, University of Helsinki)09/06/2026, 12:03Poster
Stellar magnetic activity causes different observable phenomena on a stellar surface from dark spots to bright and explosive events, such as flares and coronal mass ejections. Both flares and starspots induce variations in stellar brightness, which can be seen in light curves. Starspots and stellar rotation together produce periodic dimmings of a star, whereas flares cause sudden and irregular...
Go to contribution page -
Serena Criscuoli (NSO, US)09/06/2026, 12:04Poster
Circumfacular regions are dark structures surrounding active regions that appear in chromospheric observations, yet their physical properties and role in solar variability remain poorly constrained. Using ChroTel synoptic observations in Hฮฑ and Ca II K spanning the maximum of solar cycle 24 to the onset of cycle 25, we derive the photometric and geometric properties of circumfacular regions...
Go to contribution page -
Jin Qi (National Satellite Meteorological Center, China)09/06/2026, 12:05Poster
Solar irradiance observation is one of main objectives of Fengyun-3 (FY-3) series since the launch of first satellite FY-3A in 2008. For total solar irradiance (TSI), there are six satellites with the payload named Solar Irradiance Monitor (SIM) to perform operational observation. The performance of the instrument is gradually improving at the step of SIM-I, SIM-II and SIM-III. The SIM-III is...
Go to contribution page -
Theodosios Chatzistergos (Max Planck Institute for Solar System Research, DE)09/06/2026, 12:06Poster
Solar irradiance is one of the key external forcing agents of Earthโs climate. Quantifying the effect of its variability requires knowledge of past irradiance changes over as long timescales as possible. Since direct space-based measurements are available for less than half a century, this necessitates irradiance reconstructions using models. On climate-relevant timescales, irradiance...
Go to contribution page -
Kalugodu Chandrashekhar (Royal Observatory of Belgium, Solar Influences Data analysis Center (SIDC), Brussels, Belgium)09/06/2026, 12:07Poster
The International Sunspot Number (SN V2.0) is one of the longest and most detailed available series in astrophysics and its accuracy and stability is important for a large variety of scientific domains, not the least of which is the evolution of the Earth Climate.
Go to contribution page
Since its recalibration and release in 2015, SN V2.0 has been the subject of sustained scrutiny within the scientific community... -
Bradley E. Schaefer (Louisiana State University)09/06/2026, 12:08Poster
For consistent measures of solar activity over many cycles, the only possibility is the long historical record of sunspot counts made by human eyes looking through a telescope. For this we have records going back four centuries, but there are substantial problems with consistent calibration across many cycles. An independent data source is the large number of sunspot counts collected by the...
Go to contribution page -
Sabrina Bechet (ROB)09/06/2026, 12:09Poster
Sunspot drawings are a unique source of information to study the long-term manifestation of the magnetic activity on the solar surface. The Royal Observatory of Belgium (ROB) started such drawings around 1940 and continues today on a daily basis, making the whole collection spanning over more than 80 years.
Go to contribution page
In this presentation, we discuss two important limitations to the full scientific... -
Florian Mekhaldi (Stockholm U., SE)09/06/2026, 12:10Poster
Constraining the magnitude and occurrence of extreme solar energetic particle (SEP) events beyond the instrumental era remains central to space climate research and risk assessment. Cosmogenic radionuclides archived in polar ice cores, particularly beryllium-$^{10}$ ($^{10}$Be) and chlorine-$^{36}$ ($^{36}$Cl), provide one of the few direct observational windows into past solar activity. Here...
Go to contribution page -
Prof. Ala Aldahan (Department of Geosciences, United Arab Emirates University, Al Ain, United Arab Emirates)09/06/2026, 12:11Poster
Cosmogenic 10Be records from ice cores are important proxies for reconstructing past solar activity. However, the incorporation of the isotope signal in ice is influenced by atmospheric transport and position processes, which can complicate the interpretation of the signal. Combining data from multiple sites may help reduce such noise and enhance the robustness of 10Be-based solar activity...
Go to contribution page -
Michael W. Dee (Centre for Isotope Research, ESRIG, University of Groningen, Groningen 9747 AG, the Netherlands)09/06/2026, 12:12Poster
Several globally synchronous spikes in radiocarbon production have now been detected in known-age tree-ring archives. Such occurrences, commonly known a Miyake events, must have been prompted by enormous bursts of cosmic radiation. Extreme storms on the Sun are widely believed to be the ultimate source of this radiation. Indeed, the phenomena are expected to be akin to scaled-up versions of...
Go to contribution page -
Dr Shipra Sinha (Oulu U., FI)09/06/2026, 12:13Poster
Understanding how Earthโs magnetosphere responds to large-scale variations in the geomagnetic field is essential for constraining long-term space climate and radiation exposure. While the present-day magnetosphere is well characterized under a dipole-dominated field, its configuration during geomagnetic excursions and reversals (GER) remains poorly understood. We investigate solar...
Go to contribution page -
Giorgio Bergamin (Turin U., IT)09/06/2026, 12:14Poster
In the context of the study of the conditions of the Earth's magnetosphere and space weather, we present the magnetometer installed at the INAF-Turin Astrophysical Observatory (Italy), included in the SWELTO (Space Weather Laboratory of Turin) project. A fluxgate magnetometer, after testing and calibration, has been positioned in the Turin Observatory (45ยฐ02'27"N, 7ยฐ45'48"E), and in November...
Go to contribution page -
David Pelosi (Dipartimento di Fisica e Geologia, Universitร degli Studi di Perugia, Italy and INFN - Sezione di Perugia, Italy)09/06/2026, 12:15Poster
Investigating the relationship between galactic cosmic rays (GCRs) and solar activity is fundamental for understanding the physical mechanisms that govern particle transport in the heliosphere. Using multi-channel GCR flux data and solar activity proxies, previous studies have employed cross-correlation techniques, wavelet-coherence analyses, and information-theory- based methods, often...
Go to contribution page -
Fernando Monterde-Andrade (Instituto de Geofรญsica, Universidad Nacional Autรณnoma de Mรฉxico, 04510 Ciudad de Mรฉxico, Mexico and Institute for Space-Earth Environmental Research, Nagoya University, Chikusa, Nagoya, Aichi 464-8601, Japan)09/06/2026, 12:16Poster
The Scibar Cosmic-Ray Telescope (SciCRT) is the most promising detector of the Sierra Negra Cosmic Rays Observatory (SN-CRO). At this location, being a target and a tracker of secondary cosmic rays (SCR), the SciCRT offers a high probability of observing solar energetic particles and lower energy galactic cosmic rays (LEGCR); also, it allows the identification of incoming particles by...
Go to contribution page -
Anderson Campos Fauth (University of Campinas-UNICAMP, Brazil)09/06/2026, 12:17Poster
This study reports the detection of a major Forbush Decrease recorded on 20 January 2026 by the Tanca detector. Tanca is a ground-level water-Cherenkov detector located at the University of Campinas and operates as part of the Latin American Giant Observatory. The instrument consists of a polyethylene cylinder containing 11,400 litres of ultra-pure water, equipped with three photomultiplier...
Go to contribution page -
Mr Markus Similรค (Oulu U., FI)09/06/2026, 12:18Poster
Galactic cosmic rays (GCRs) exhibit a small anisotropy around Earth, which presents as diurnal variation (DV) in the count rates of ground-based neutron monitors (NMs). This fluctuation has a typical amplitude of around 0.3 %. Although the properties of DV have been extensively studied, previous literature still lacks a generalized DV model. Such a model could be used, for example, to separate...
Go to contribution page -
Mr Bertalan Csapo (Oulu U., FI)09/06/2026, 12:19Poster
High-energy solar particles entering the Earthโs atmosphere can significantly increase radiation exposure at flight altitudes, especially during Ground Level Enhancement (GLE) events. The aim of this work is to investigate aviation radiation exposure during the GLE#76 event on 21 November 2024, with a focus on estimating effective dose at aviation altitude. During the calculations, the...
Go to contribution page -
Oscar Batalla (Department of Physics, University of Turin, Italy)09/06/2026, 12:20Poster
When solar energetic particle (SEP) events are observed at the ground by at least two sea- level neutron monitors (NMs) at different locations, they are called Ground Level Enhancements (GLEs). Very rarely, SEP-associated increases are observed exclusively at polar high-altitude NMs, which are the most sensitive NMs on Earth due to their reduced geomagnetic and atmospheric shielding. These...
Go to contribution page -
Emilia Kilpua (University of Helsinki, Finland)09/06/2026, 12:21Poster
Coronal mass ejections (CMEs) are the primary drivers of the strongest magnetospheric disturbances at Earth and other planets. The driving ejecta, often exhibiting flux rope signatures, carries the most sustained and intense magnetic fields. However, the sheath preceding a fast CME can also drive major disturbances, particularly at higher altitudes and in the radiation environment, due to its...
Go to contribution page -
Juan Josรฉ Curto Subirats (Observatori de lโEbre, ES)09/06/2026, 12:22Poster
In this presentation we want to update on the progress made since the release of the EPOS data portal in 2023.
Go to contribution page
Research in the geomagnetic and electromagnetic geophysics community have long benefitted from open international exchange of knowledge. Open access to data, models and codes has become increasingly important in a landscape of multi-disciplinary research questions to support societal... -
Louis Foujols (ISAE-SUPAERO, Toulouse, France and German Aerospace Center (DLR), Earth Observation Center (EOC), Weรling, Germany)09/06/2026, 12:23Poster
As modern urban studies leverage high-cadence Earth Observation (EO) data for Smart Cities applications, the radiometric consistency of satellite imagery becomes a critical factor for automated analysis. However, solar activity cycles and long-term space climate variability significantly affect the ionosphere and upper atmosphere. These fluctuations introduce noise and geometric distortions...
Go to contribution page -
Jani Mantere (Oulu U., FI)09/06/2026, 12:24Poster
The long observational record of POES satellites (1979 to present) is often used to estimate the EEP and study its long-term evolution and atmospheric impacts. The unique POES record has been the basis for the CMIP6 and CMIP7 versions of the EEP forcing recommended as an input to chemistry-climate models. While the POES measurements provide a long and nearly continuous data series they suffer,...
Go to contribution page -
Neethal Thomas (Oulu U., FI)09/06/2026, 12:25Poster
In polar latitudes, energetic electron precipitation (EEP; energies ~10s of keV to a few MeV) originating from the radiation belts and plasma sheet has a significant impact on the neutral composition and chemistry of the atmosphere in the mesosphereโlower thermosphere (โผ60โ 120 km) region. Precipitating electrons greatly disturb the atmospheric concentrations of odd nitrogen (NOx) and odd...
Go to contribution page -
Lucaferri Lorenza (University of Rome Tor Vergata)09/06/2026, 12:26Poster
Despite solar radiation being the primary external energy source driving the Earthโs climate system, the climatic impact of its long- term variations โ such as prolonged periods of low solar activity called Grand Minima โ still remains debatable due to the wide spread in solar irradiance reconstructions. Given the large implica- tions for detection and attribution studies, particularly to...
Go to contribution page -
Hana Hanzlรญkovรก (Institute of Atmospheric Physics, Czech Academy of Sciences, Praha, Czechia)09/06/2026, 12:27Poster
There is growing evidence that solar variability associated with the 11-year sunspot cycle, particularly during solar minima and maxima, influences the troposphere. Numerous observational and modelling studies have linked the solar cycle to winter weather and climate variability in the Euro-Atlantic region. However, the strength of these links remains debated, owing to their reduced stability...
Go to contribution page -
Veera Juntunen (University of Oulu, Finland)09/06/2026, 12:28Poster
In wintertime, the stratospheric polar vortex strongly influences European weather, affecting temperature, wind speed, and cloudiness. A strong polar vortex is typically associated with milder, windier, and cloudier conditions in northern Europe, while colder, calmer, and clearer weather prevails in southern Europe. Cloudiness directly controls the amount of solar radiation reaching the...
Go to contribution page -
Wojciech J. Miloch (Department of Physics, University of Oslo, Oslo, Norway)09/06/2026, 12:29Poster
Instabilities and turbulence in the Earth ionosphere can lead to irregularities in the ionospheric plasma density. Ionospheric plasma irregularities are important space weather effects, which can significantly impact the propagation of radio waves through the upper atmosphere, and consequently degrade the quality of trans- ionospheric signals and communication with satellites. This can...
Go to contribution page -
Frank Stefani (Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, D-01328 Dresden, Germany)09/06/2026, 16:38Poster
We present a solar dynamo model that appears capable of explaining various periodicities across a wide range of timescales in a self-consistent manner [1]. Starting with Rieger-type periodicities, we demonstrate that the two-planet spring tides of Venus, Earth, and Jupiter can excite magneto-Rossby waves in the solar tachocline. These waves have typical periods ranging from 100 to 300 days,...
Go to contribution page -
Laurie Lamy-Proulx (Universitรฉ de Montrรฉal, Montrรฉal, Canada)09/06/2026, 16:39Poster
The magnetohydrodynamic dynamo effect, which governs the interactions between internal solar fluid flows and magnetic fields, drives the Sunโs 11-year activity cycle. The meridional circulation, a key aspect of this process, plays a crucial role in regulating the solar cycle and its large-scale magnetic field, particularly within the framework of flux transport dynamo models. However, the deep...
Go to contribution page -
Zebin Zhang (Institute of Frontier and Interdisciplinary Science and Institute of Space Sciences, Shandong University, People's Republic of China)09/06/2026, 16:40Poster
As the solar magnetic cycle evolves, subsurface toroidal magnetic flux is systematically generated and lost, and this work aims to identify the dominant process behind the flux loss. By employing a data-driven dynamo model and holding surface magnetic flux transport identical across the cycles 12-21, we conducted numerical experiments to isolate and assess the loss of subsurface toroidal flux,...
Go to contribution page -
Emilia Rintamรคki (Department of Physics, University of Helsinki)09/06/2026, 16:41Poster
Stellar magnetic activity causes different observable phenomena on a stellar surface from dark spots to bright and explosive events, such as flares and coronal mass ejections. Both flares and starspots induce variations in stellar brightness, which can be seen in light curves. Starspots and stellar rotation together produce periodic dimmings of a star, whereas flares cause sudden and irregular...
Go to contribution page -
Criscuoli Serena (NSO, US)09/06/2026, 16:42Poster
Circumfacular regions are dark structures surrounding active regions that appear in chromospheric observations, yet their physical properties and role in solar variability remain poorly constrained. Using ChroTel synoptic observations in Hฮฑ and Ca II K spanning the maximum of solar cycle 24 to the onset of cycle 25, we derive the photometric and geometric properties of circumfacular regions...
Go to contribution page -
Jin Qi (National Satellite Meteorological Center, China)09/06/2026, 16:43Poster
Solar irradiance observation is one of main objectives of Fengyun-3 (FY-3) series since the launch of first satellite FY-3A in 2008. For total solar irradiance (TSI), there are six satellites with the payload named Solar Irradiance Monitor (SIM) to perform operational observation. The performance of the instrument is gradually improving at the step of SIM-I, SIM-II and SIM-III. The SIM-III is...
Go to contribution page -
Theodosios Chatzistergos (Max Planck Institute for Solar System Research, DE)09/06/2026, 16:44Poster
Solar irradiance is one of the key external forcing agents of Earthโs climate. Quantifying the effect of its variability requires knowledge of past irradiance changes over as long timescales as possible. Since direct space-based measurements are available for less than half a century, this necessitates irradiance reconstructions using models. On climate-relevant timescales, irradiance...
Go to contribution page -
Kalugodu Chandrashekhar (Royal Observatory of Belgium, Solar Influences Data analysis Center (SIDC), Brussels, Belgium)09/06/2026, 16:45Poster
The International Sunspot Number (SN V2.0) is one of the longest and most detailed available series in astrophysics and its accuracy and stability is important for a large variety of scientific domains, not the least of which is the evolution of the Earth Climate.
Go to contribution page
Since its recalibration and release in 2015, SN V2.0 has been the subject of sustained scrutiny within the scientific community... -
Bradley E. Schaefer (Louisiana State University)09/06/2026, 16:46Poster
For consistent measures of solar activity over many cycles, the only possibility is the long historical record of sunspot counts made by human eyes looking through a telescope. For this we have records going back four centuries, but there are substantial problems with consistent calibration across many cycles. An independent data source is the large number of sunspot counts collected by the...
Go to contribution page -
Sabrina Bechet (ROB)09/06/2026, 16:47Poster
Sunspot drawings are a unique source of information to study the long-term manifestation of the magnetic activity on the solar surface. The Royal Observatory of Belgium (ROB) started such drawings around 1940 and continues today on a daily basis, making the whole collection spanning over more than 80 years.
Go to contribution page
In this presentation, we discuss two important limitations to the full scientific... -
Florian Mekhaldi (Stockholm U., SE)09/06/2026, 16:48Poster
Constraining the magnitude and occurrence of extreme solar energetic particle (SEP) events beyond the instrumental era remains central to space climate research and risk assessment. Cosmogenic radionuclides archived in polar ice cores, particularly beryllium-$^{10}$ ($^{10}$Be) and chlorine-$^{36}$ ($^{36}$Cl), provide one of the few direct observational windows into past solar activity. Here...
Go to contribution page -
Prof. Ala Aldahan (Department of Geosciences, United Arab Emirates University, Al Ain, United Arab Emirates)09/06/2026, 16:49Poster
Cosmogenic 10Be records from ice cores are important proxies for reconstructing past solar activity. However, the incorporation of the isotope signal in ice is influenced by atmospheric transport and position processes, which can complicate the interpretation of the signal. Combining data from multiple sites may help reduce such noise and enhance the robustness of 10Be-based solar activity...
Go to contribution page -
Michael W. Dee (Centre for Isotope Research, ESRIG, University of Groningen, Groningen 9747 AG, the Netherlands)09/06/2026, 16:50Poster
Several globally synchronous spikes in radiocarbon production have now been detected in known-age tree-ring archives. Such occurrences, commonly known a Miyake events, must have been prompted by enormous bursts of cosmic radiation. Extreme storms on the Sun are widely believed to be the ultimate source of this radiation. Indeed, the phenomena are expected to be akin to scaled-up versions of...
Go to contribution page -
Dr Shipra Sinha (Oulu U., FI)09/06/2026, 16:51Poster
Understanding how Earthโs magnetosphere responds to large-scale variations in the geomagnetic field is essential for constraining long-term space climate and radiation exposure. While the present-day magnetosphere is well characterized under a dipole-dominated field, its configuration during geomagnetic excursions and reversals (GER) remains poorly understood. We investigate solar...
Go to contribution page -
Giorgio Bergamin (INAF OATo)09/06/2026, 16:52Poster
In the context of the study of the conditions of the Earth's magnetosphere and space weather, we present the magnetometer installed at the INAF-Turin Astrophysical Observatory (Italy), included in the SWELTO (Space Weather Laboratory of Turin) project. A fluxgate magnetometer, after testing and calibration, has been positioned in the Turin Observatory (45ยฐ02'27"N, 7ยฐ45'48"E), and in November...
Go to contribution page -
David Pelosi (Dipartimento di Fisica e Geologia, Universitร degli Studi di Perugia, Italy and INFN - Sezione di Perugia, Italy)09/06/2026, 16:54Poster
Investigating the relationship between galactic cosmic rays (GCRs) and solar activity is fundamental for understanding the physical mechanisms that govern particle transport in the heliosphere. Using multi-channel GCR flux data and solar activity proxies, previous studies have employed cross-correlation techniques, wavelet-coherence analyses, and information-theory- based methods, often...
Go to contribution page -
Fernando Monterde-Andrade (Instituto de Geofรญsica, Universidad Nacional Autรณnoma de Mรฉxico, 04510 Ciudad de Mรฉxico, Mexico and Institute for Space-Earth Environmental Research, Nagoya University, Chikusa, Nagoya, Aichi 464-8601, Japan)09/06/2026, 16:55Poster
The Scibar Cosmic-Ray Telescope (SciCRT) is the most promising detector of the Sierra Negra Cosmic Rays Observatory (SN-CRO). At this location, being a target and a tracker of secondary cosmic rays (SCR), the SciCRT offers a high probability of observing solar energetic particles and lower energy galactic cosmic rays (LEGCR); also, it allows the identification of incoming particles by...
Go to contribution page -
Anderson Campos Fauth (University of Campinas-UNICAMP, Brazil)09/06/2026, 16:56Poster
This study reports the detection of a major Forbush Decrease recorded on 20 January 2026 by the Tanca detector. Tanca is a ground-level water-Cherenkov detector located at the University of Campinas and operates as part of the Latin American Giant Observatory. The instrument consists of a polyethylene cylinder containing 11,400 litres of ultra-pure water, equipped with three photomultiplier...
Go to contribution page -
Mr Markus Similรค (Oulu U., FI)09/06/2026, 16:57Poster
Galactic cosmic rays (GCRs) exhibit a small anisotropy around Earth, which presents as diurnal variation (DV) in the count rates of ground-based neutron monitors (NMs). This fluctuation has a typical amplitude of around 0.3 %. Although the properties of DV have been extensively studied, previous literature still lacks a generalized DV model. Such a model could be used, for example, to separate...
Go to contribution page -
Mr Bertalan Csapo (Oulu U., FI)09/06/2026, 16:58Poster
High-energy solar particles entering the Earthโs atmosphere can significantly increase radiation exposure at flight altitudes, especially during Ground Level Enhancement (GLE) events. The aim of this work is to investigate aviation radiation exposure during the GLE#76 event on 21 November 2024, with a focus on estimating effective dose at aviation altitude. During the calculations, the...
Go to contribution page -
Oscar Batalla (Department of Physics, University of Turin, Italy)09/06/2026, 16:59Poster
When solar energetic particle (SEP) events are observed at the ground by at least two sea- level neutron monitors (NMs) at different locations, they are called Ground Level Enhancements (GLEs). Very rarely, SEP-associated increases are observed exclusively at polar high-altitude NMs, which are the most sensitive NMs on Earth due to their reduced geomagnetic and atmospheric shielding. These...
Go to contribution page -
Emilia Kilpua (University of Helsinki, Finland)09/06/2026, 17:00Poster
Coronal mass ejections (CMEs) are the primary drivers of the strongest magnetospheric disturbances at Earth and other planets. The driving ejecta, often exhibiting flux rope signatures, carries the most sustained and intense magnetic fields. However, the sheath preceding a fast CME can also drive major disturbances, particularly at higher altitudes and in the radiation environment, due to its...
Go to contribution page -
Juan Josรฉ Curto Subirats (Observatori de lโEbre, ES)09/06/2026, 17:01Poster
In this presentation we want to update on the progress made since the release of the EPOS data portal in 2023.
Go to contribution page
Research in the geomagnetic and electromagnetic geophysics community have long benefitted from open international exchange of knowledge. Open access to data, models and codes has become increasingly important in a landscape of multi-disciplinary research questions to support societal... -
Louis Foujols (ISAE-SUPAERO, Toulouse, France and German Aerospace Center (DLR), Earth Observation Center (EOC), Weรling, Germany)09/06/2026, 17:02Poster
As modern urban studies leverage high-cadence Earth Observation (EO) data for Smart Cities applications, the radiometric consistency of satellite imagery becomes a critical factor for automated analysis. However, solar activity cycles and long-term space climate variability significantly affect the ionosphere and upper atmosphere. These fluctuations introduce noise and geometric distortions...
Go to contribution page -
Jani Mantere (Oulu U., FI)09/06/2026, 17:03Poster
The long observational record of POES satellites (1979 to present) is often used to estimate the EEP and study its long-term evolution and atmospheric impacts. The unique POES record has been the basis for the CMIP6 and CMIP7 versions of the EEP forcing recommended as an input to chemistry-climate models. While the POES measurements provide a long and nearly continuous data series they suffer,...
Go to contribution page -
Neethal Thomas (Oulu U., FI)09/06/2026, 17:04Poster
In polar latitudes, energetic electron precipitation (EEP; energies ~10s of keV to a few MeV) originating from the radiation belts and plasma sheet has a significant impact on the neutral composition and chemistry of the atmosphere in the mesosphereโlower thermosphere (โผ60โ 120 km) region. Precipitating electrons greatly disturb the atmospheric concentrations of odd nitrogen (NOx) and odd...
Go to contribution page -
Lucaferri Lorenza (University of Rome Tor Vergata)09/06/2026, 17:05Poster
Despite solar radiation being the primary external energy source driving the Earthโs climate system, the climatic impact of its long- term variations โ such as prolonged periods of low solar activity called Grand Minima โ still remains debatable due to the wide spread in solar irradiance reconstructions. Given the large implica- tions for detection and attribution studies, particularly to...
Go to contribution page -
Hana Hanzlรญkovรก (Institute of Atmospheric Physics, Czech Academy of Sciences, Praha, Czechia)09/06/2026, 17:06Poster
There is growing evidence that solar variability associated with the 11-year sunspot cycle, particularly during solar minima and maxima, influences the troposphere. Numerous observational and modelling studies have linked the solar cycle to winter weather and climate variability in the Euro-Atlantic region. However, the strength of these links remains debated, owing to their reduced stability...
Go to contribution page -
Veera Juntunen (University of Oulu, Finland)09/06/2026, 17:07Poster
In wintertime, the stratospheric polar vortex strongly influences European weather, affecting temperature, wind speed, and cloudiness. A strong polar vortex is typically associated with milder, windier, and cloudier conditions in northern Europe, while colder, calmer, and clearer weather prevails in southern Europe. Cloudiness directly controls the amount of solar radiation reaching the...
Go to contribution page -
Wojciech J. Miloch (Department of Physics, University of Oslo, Oslo, Norway)09/06/2026, 17:08Poster
Instabilities and turbulence in the Earth ionosphere can lead to irregularities in the ionospheric plasma density. Ionospheric plasma irregularities are important space weather effects, which can significantly impact the propagation of radio waves through the upper atmosphere, and consequently degrade the quality of trans- ionospheric signals and communication with satellites. This can...
Go to contribution page -
Mr Markus Similรค (Oulu U., FI)Poster
-
Mr Markus Similรค (Oulu U., FI)Poster
Galactic cosmic rays (GCRs) exhibit a small anisotropy around Earth, which presents as diurnal variation (DV) in the count rates of ground-based neutron monitors (NMs). This fluctuation has a typical amplitude of around 0.3 %. Although the properties of DV have been extensively studied, previous literature still lacks a generalized DV model. Such a model could be used, for example, to separate...
Go to contribution page -
Anil Bhardwaj (Physical Research Laboratory (PRL), Ahmedabad, India)Poster
Space Weather research in India started in the middle of nineteenth century with geomagnetic observations leading to earlier records of extreme events in 1870s. Indiaโs oldest Solar observatory established in 1899 rendered innovative science on solar dynamics. Radio sounding of upper atmosphere started in early twentieth century and yielded path-breaking science results on equatorial...
Go to contribution page -
Anil Bhardwaj (Physical Research Laboratory (PRL), Ahmedabad, India)Poster
Space Weather research in India started in the middle of nineteenth century with geomagnetic observations leading to earlier records of extreme events in 1870s. Indiaโs oldest Solar observatory established in 1899 rendered innovative science on solar dynamics. Radio sounding of upper atmosphere started in early twentieth century and yielded path-breaking science results on equatorial...
Go to contribution page
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