The LLBL formation and thickness under sudden changes of IMF conditions

0446735 - ÚFA 2016 CZ eng A - Abstract
Šafránková, J. - Němeček, Z. - Grygorov, K. - Krupařová, Oksana - Šimůnek, Jiří - Pi, G. - Shue, J.H.
The LLBL formation and thickness under sudden changes of IMF conditions.
26th IUGG General Assembly 2015. Earth and Environmental Sciences for Future Generations : abstracts. Prague: International Union of Geodesy and Geophysics, 2015. IUGG-2837.
[Earth and Environmental Sciences for Future Generations. General Assembly of International Union of Geodesy and Geophysics /26./. 22.06.2015-02.07.2015, Prague]
Institutional support: RVO:68378289
Keywords : magnetopause and boundary layers * magnetospheric physics * space plasma physics
Subject RIV: DG - Athmosphere Sciences, Meteorology
http://www.iugg2015prague.com/abstractcd/data/HtmlApp/main.html#

A clear dependence of a basic structure of two sublayers of the low-latitude boundary layer (LLBL) on northward and southward interplanetary magnetic field (IMF) orientations is demonstrated. The outer part of the LLBL is present under northward IMF conditions, however, it is missing during a southward pointing IMF. This behavior can be understood in terms of a motion of reconnection spots due to the changes of the orientation of the magnetosheath magnetic field in the vicinity of the magnetopause. In this paper, we analyze a response of the LLBL formation and thickness on IMF turns. Our case studies demonstrate that the changes of the LLBL structure can be observed in the subsolar region as well as on flanks near the dawn-dusk meridian. It implies that all processes suggested for the dayside LLBL formation except magnetic reconnection are ineffective under a southward IMF orientation.
Permanent Link: http://hdl.handle.net/11104/0248903