Conveners
2.4 Magnetosphere-ionosphere-thermosphere and space climate hazards (chair Nandita Srivastava)
- Eija Tanskanen (Oulu U., FI)
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Dr Oleksiy Agapitov (California Berkeley U., US)12/06/2026, 09:00Invited review
Very Low Frequency (VLF) whistler-mode chorus and hiss emissions are pervasive features of the Earth’s magnetosphere, playing a critical role in controlling the dynamics of the outer Van Allen radiation belt. Through interactions with trapped electrons, these waves drive both upper-atmosphere ionization and the energization of relativistic electrons, posing significant space weather hazards to...
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Dr Dogacan Ozturk (Alaska Fairbanks U., US)12/06/2026, 09:20Solicited
At high-latitude regions on the Earth, auroral displays exhibit strong spatiotemporal variability yet fall into broad morphological classifications. Studies have shown that different types of aurora can exhibit distinct particle precipitation energies and fluxes, convection electric field configurations, and preferential occurrence rates across different levels of geomagnetic activity. The...
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Prof. Eija Tanskanen (FI)12/06/2026, 09:40
The energy from the Sun emitted in a large variety of frequencies is powering the polar areas, but the energy is not distributed evenly over the latitudes. We found out that over 40% of the available energy dissipates to the 2° wide band around 67° CGM when the area between 56-76° CGM is considered. During winter months the largest amount of energy dissipates to a narrower latitudinal range...
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Nicholas Larsen (Nagoya U., JP)12/06/2026, 09:52
he first of a successful line of semi-empirical magnetospheric models was created by Tsyganenko (1989), henceforth referred to as the TSY models. TSY89 captured the structure of the magnetosphere well for low to mid geomagnetic disturbances and was parametrised simply using the planetary Kp index. For this reason, TSY89 is still widely used today when modelling the magnetosphere under similar...
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Achuthan Nair (Oulu U., FI)12/06/2026, 10:04
The solar wind, a stream of charged particles emanating from the Sun, interacts with Earth’s magnetosphere. This interaction creates space weather phenomena such as geomagnetic storms, substorms, and auroras. Space weather is driven by solar wind and the interplanetary magnetic field (IMF) which drive ionospheric electric currents in the Earth’s magnetosphere and ionosphere. It is well-known...
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64. Hemispheric and dawn-dusk asymmetries of Kelvin-Helmholtz waves driven by dipole tilt and IMF ByDr Lauri Holappa (Oulu U., FI)12/06/2026, 10:16
Along with magnetic reconnection, Kelvin-Helmholtz (KH) waves are the main mechanisms controlling the solar wind-magnetosphere interaction. Kelvin-Helmholtz waves have been shown to be important for plasma transport into the magnetosphere, enabled by secondary processes such as reconnection, diffusion and wave-particle interactions. Here we use magnetohydrodynamical (MHD) simulations for...
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Dr Qian Wu (NCAR, US)12/06/2026, 10:28
Multi-year observations of the thermospheric wind are available at many mid latitude locations. NCAR and other institutes have been operating ground based Fabry Perot interferometer for nighttime O 630 nm airglow Doppler remote sensing to monitor thermospheric winds. Thermospheric winds are affected by solar and geomagnetic activities, as well as atmospheric tides from lower atmosphere. Long...
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