Počet záznamů: 1
Variations of the LLBL thickness under abrupt IMF changes
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SYSNO ASEP 0491086 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název Variations of the LLBL thickness under abrupt IMF changes Tvůrce(i) Grygorov, K. (CZ)
Krupařová, Oksana (UFA-U) RID, ORCID
Pi, G. (CZ)
Němeček, Z. (CZ)
Šafránková, J. (CZ)Celkový počet autorů 5 Zdroj.dok. Geophysical Research Abstracts, EGU General Assembly 2018, Vol. 20. - Göttingen : European Geosciences Union, 2018
EGU2018-4367-1Poč.str. 1 s. Forma vydání Online - E Akce EGU General Assembly 2018 Datum konání 08.04.2018 - 13.04.2018 Místo konání Vienna Země AT - Rakousko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova magnetospheric plasma ; magnetopause ; interplanetary magnetic field ; solar wind Vědní obor RIV DG - Vědy o atmosféře, meteorologie Obor OECD Fluids and plasma physics (including surface physics) Institucionální podpora UFA-U - RVO:68378289 Anotace A low-latitude boundary layer (LLBL) filled by magnetosheath-like and magnetospheric plasmas can be found at low latitudes along the whole dayside magnetopause and along magnetospheric flanks. The thickness of the LLBL varies from about 0.1 Re near a local noon to about 0.6 Re at the dawn and dusk flanks, however, a very thick
LLBL (up to several RE) at the dawn flank was also reported. The thickness increases with increasing distance from the subsolar point and the plasma flow velocity in the anti-sunward direction becomes faster. It was shown that the LLBL exhibits a density plateau rather than a density gradient at the dayside magnetopause and that the LLBL is one of sublayers of the boundary layer. Moreover, some correlation of the LLBL thickness with the interplanetary magnetic field (IMF) orientation (the LLBL is thicker under northward than under southward IMF)
and with the enhanced solar wind dynamic pressure were found. We use magnetic field and plasma observations at several points of the LLBL and simultaneous monitoring of the adjacent magnetosheath as registered by THEMIS. The spacecraft configuration allows us to determine the LLBL thickness under different upstream conditions. We focus predominantly on the speed of variations of the LLBL thickness when the IMF orientation changes. We observe that the changes of the LLBL thickness follow immediately the variations of the interplanetary as well as magnetosheath magnetic field directions but the rate of the thickness change is significantly larger for the southward IMF turn.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 2019
Počet záznamů: 1