Space Climate 10

Session

3.3 Historical proxy (chair Delores Knipp)

11 Jun 2026, 16:05

Åland Maritime Museum

Conveners

3.3 Historical proxy (chair Delores Knipp)

• Hisashi Hayakawa (Nagoya U., JP)

51. Solar flare effects in retrospect

Juan José Curto Subirats (Observatori de l’Ebre, ES)

11/06/2026, 16:05

Invited review

Solar flare effects (Sfe) are rapid variations in the Earth’s magnetic field. They are the response to an enhancement of the amount of radiation during Solar flare events.
The Carrington’s observations in 1859 related geomagnetic variations with solar radiations. They represented the first direct evidence of the connection between the Sun’s activity and the Earth’s environment. Since then,...

52. Improving our knowledge of the solar diameter: a new look involving the leptocline

Jean-Pierre Rozelot (Université Côte d’Azur, FR)

11/06/2026, 16:25

Solicited

Among all the fundamental solar parameters, mass, surface gravity, temperature, luminosity..., all well inventoried for several years in reference books, solar diameter is still a controversial issue, both its true value and any possible temporal variations. The most exact value of the solar diameter is of importance, as it serves as an astronomical standard. Changing its absolute value can,...

53. Solar cycles over a millennial timescale: Reconstruction and statistics

Ilya Usoskin (Oulu U., FI)

11/06/2026, 16:45

Solar cyclic activity was discovered in the 19$^\textrm{th}$ century and traced back to 1610 CE through directly observed sunspots. Using indirect cosmogenic proxy data, such as $^{14}$C in tree trunks and $^{10}$Be in ice cores, it is possible to reconstruct long-term solar activity back for several millennia, but individual cycles were not readily resolved. Thanks to the recent breakthrough...

54. When do observations become historical?

Alexander Pevtsov (US National Solar Observatory, US)

11/06/2026, 16:57

The 21$^\textrm{st}$ century has brought us many new and exciting groundbreaking facilities such as Daniel K. Inouye Solar Telescope (DKIST), Solar Dynamics Observatory (SDO), and Solar Orbiter (SO) with more on the horizon such as Next Generation Ground based Solar Observing Network (ngGONG) and PHOtospheric Magnetograph Imager (PHOMI) for upcoming NOAA SpaceWeather Geostationary (SWGEO)...