Počet záznamů: 1
Properties of saturated bi-stable magnetosheath mirror structures
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SYSNO ASEP 0452255 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název Properties of saturated bi-stable magnetosheath mirror structures Tvůrce(i) Souček, Jan (UFA-U) RID, ORCID
Escoubet, C. P. (NL)Celkový počet autorů 2 Zdroj.dok. Cluster 15th and Double Star 10th anniversary workshop. - Venice : CAA - ESA, 2015
S. 13-14Poč.str. 2 s. Forma vydání Online - E Akce Cluster Workshop /25./ Datum konání 12.10.2015–16.10.2015 Místo konání Venice Země IT - Itálie Typ akce WRD Jazyk dok. eng - angličtina Země vyd. IT - Itálie Klíč. slova magnetospheric physics ; plasma waves and instabilities ; magnetosheath Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Institucionální podpora UFA-U - RVO:68378289 Anotace Mirror mode structures in the magnetosheath are characterized by non-periodic low frequency field and plasma oscillations, where magnetic field magnitude alternates between two meta-stable values (high and low field level). This property of fully saturated mirror modes is often referred to as bi-stability in the literature. We investigated mirror structures of this form using two years of Cluster observations focusing on the width of the structures and magnitudes of the low field and high field areas. In the statistical study it was observed that the plasma in the high field areas is usually stable or marginally stable with respect to mirror instability, but plasma corresponding to the low field level is unstable. The relative width of the low and high field areas is thus proportional to the degree of instability of the plasma consistently with the previously described association between mirror mode shape (magnetic peaks or dips) and distance to mirror instability threshold. It is shown that the areas of low magnetic field level and unstable plasma are usually comparable or smaller than the mirror mode wavelength, indicating fully saturated state where the mirror instability is no longer efficient. The observed values were compared with low field saturation level predicted from particle trapping theory and high field level calculated from a marginal stability condition. 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 2016
Počet záznamů: 1