A review of the SCOSTEP’s 5-year scientific program VarSITI—Variability of the Sun and Its Terrestrial Impact

Progress in Earth and Planetary Science

Kazuo Shiokawa¹  Katya Georgieva² 

[1] Institute for Space-Earth Environmental Research (ISEE), Nagoya University, Furo-cho, Chikusa-ku, 464-8601, Nagoya, Aichi, Japan;Space Research and Technology Institute (SRTI), Bulgarian Academy of Sciences, Sofia, Bulgaria;Climate, Atmosphere and Water Research Institute (CAWRI), Bulgarian Academy of Sciences, Sofia, Bulgaria;

关键词: VarSITI;    Variability of the Sun and its terrestrial impact;    Sun;    Heliosphere;    Inner magnetosphere;    Ionosphere;    Thermosphere;    Middle atmosphere;    Climate change;    Space weather;   

DOI  :  10.1186/s40645-021-00410-1

来源: Springer

【 摘 要 】

The Sun is a variable active-dynamo star, emitting radiation in all wavelengths and solar-wind plasma to the interplanetary space. The Earth is immersed in this radiation and solar wind, showing various responses in geospace and atmosphere. This Sun–Earth connection variates in time scales from milli-seconds to millennia and beyond. The solar activity, which has a ~11-year periodicity, is gradually declining in recent three solar cycles, suggesting a possibility of a grand minimum in near future. VarSITI—variability of the Sun and its terrestrial impact—was the 5-year program of the scientific committee on solar-terrestrial physics (SCOSTEP) in 2014–2018, focusing on this variability of the Sun and its consequences on the Earth. This paper reviews some background of SCOSTEP and its past programs, achievements of the 5-year VarSITI program, and remaining outstanding questions after VarSITI.

【 授权许可】

CC BY