Naslov
Plasmapause evolution from 7th to 9th September 2017 deduced from Van Allen Probes

Autori
Ivanković, Ljiljana ; Bandić, Mario ; Verbanac, Giuliana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, pp prezentacija, znanstveni

Skup
18th European Space Weather Week

Mjesto i datum
Zagreb, Hrvatska, 24.-28.10.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
plasmasphere ; plasmapause ; Van Allen Probes ; interchange instability

Sažetak
Plasmasphere is a region of cold dense plasma in the inner magnetosphere. Its outer boundary, plasmapause is characterized by a steep fall in particle density over a short distance. There are different views on plasmapause formation, and one of the questions is whether plasmapause reacts to solar wind drivers simultaneously in all magnetic local times (MLTs) or not. Here, we analyze changes in plasmaspheric electron density profiles in the period from 7th to 9th September 2017, that encompasses geomagnetic storm caused by two successive coronal mass ejections. Electron densities are derived from measurements by Van Allen Probes, a two-spacecraft mission. Profiles are first divided into two different MLT sectors, morning and afternoon, and are compared to the changes in geomagnetic index Kp. We found that the plasmapause response to the Kp increase in the afternoon MLT sector lags behind the morning sector by roughly 6 hours, indicating that the plasmapause is not formed in all MLTs simultaneously. The results add values for space weather since the plasmapause mark the limit between completely different plasma environments.

Izvorni jezik
Engleski

Znanstvena područja
Geofizika

POVEZANOST RADA