Occurrence of EMIC Waves in the Magnetosphere According to Their Distance to the Magnetopause

0539531 - ÚFA 2022 RIV US eng J - Journal Article
Grison, Benjamin - Santolík, Ondřej - Lukačevič, Jan - Usanova, M.E.
Occurrence of EMIC Waves in the Magnetosphere According to Their Distance to the Magnetopause.
Geophysical Research Letters. Roč. 48, č. 3 (2021), č. článku e2020GL090921. ISSN 0094-8276. E-ISSN 1944-8007
R&D Projects: GA ČR(CZ) GA18-05285S
EU Projects: European Commission(XE) 870452 - PAGER
Grant - others:AV ČR(CZ) AP1401
Program: Akademická prémie - Praemium Academiae
Institutional support: RVO:68378289
Keywords : Gyrofrequency * Magnetopause * Magnetospheres * Wave-particle Interactions
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 5.576, year: 2021
Method of publishing: Open access
https://oadoi.org/10.1029/2020GL090921

Wave growth of electromagnetic ion cyclotron (EMIC) emissions observed in the outer magnetosphere is mainly controlled by compression events resulting from solar wind dynamic pressure pulses. During such events wave growth is expected to be maximum close to the magnetopause. In previous studies, distribution of EMIC waves was analyzed according to their distance from the Earth, which is inadequate for studying the magnetopause region. We map a data set of EMIC waves observed by Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft according to their distance from case‐by‐case modeled magnetopause. EMIC occurrence rate is found to be maximum within two Earth radii from the magnetopause and then it linearly decreases with an increasing distance, especially close to the local noon. Asymmetries between the morning and evening magnetic sectors are explained by asymmetries in the upstream conditions and by the presence of another EMIC population of a different origin.
Permanent Link: http://hdl.handle.net/11104/0317272