Počet záznamů: 1
EMIC wave properties according to their distance to the magnetopause
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SYSNO ASEP 0538855 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název EMIC wave properties according to their distance to the magnetopause Tvůrce(i) Grison, Benjamin (UFA-U) RID, ORCID Celkový počet autorů 1 Zdroj.dok. AGU Fall Meeting. - : American Geophysical Union, 2020
SM034-0008Poč.str. 1 s. Forma vydání Online - E Akce AGU Fall Meeting 2020 Datum konání 01.12.2020 - 17.12.2020 Místo konání online everywhere Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova magnetopause ; electromagnetic ion cyclotron (EMIC) emissions ; THEMIS spacecraft Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) Institucionální podpora UFA-U - RVO:68378289 Anotace Wave particle interactions play an important role in the magnetosphere dynamics. ElectroMagnetic ion cyclotron (EMIC) waves are one of the kind of plasma waves involved in these interactions. After the first in situ observations of EMIC waves close to the plasmapause, many statistical studies pointed out that the dayside magnetosphere region close to the magnetopause is the place where the EMIC occurrence rate is the highest. In this region the EMIC wave occurrence is related to magnetosphere compression events, in relation with solar wind kinetic pressure increases.
Mapping of EMIC waves in the dayside magnetosphere are usually performed according to the L-shell value of the observations (the L-shell value of a location in the magnetosphere being the distance to the Earth). It is more difficult to investigate the wave occurrence rates according to their distance to the magnetopause because the magnetopause position is not precisely known at a given time. Considering a magnetopause model allows to get around this difficulty.
The considered EMIC wave events are the ones gathered by Usanova et al. (2012) based on Flux Gate Magnetometers measurements onboard THEMIS spacecraft and the magnetopause position is given by the Shue et al. model (1998). EMIC waves are found to maximize in the vicinity of the magnetopause (within 2 Earth radii), in the morning and noon magnetic local time (MLT) sectors. Dependence of EMIC wave parameters (wave normal angle, ellipticity, and degree of polarization) on the distance to the magnetopause and on the magnetic latitude of the observations are compared to the EMIC wave occurrence rates in order to estimate the location of wave amplification region.Pracoviště Ústav fyziky atmosféry Kontakt Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Rok sběru 2021
Počet záznamů: 1