Occurrence rate of EMIC wave event locations as a function of their distance to the magnetopause

0508523 - ÚFA 2020 DE eng A - Abstrakt
Grison, Benjamin - Hanzelka, Miroslav - Lukačevič, Jan - Usanova, M. - Souček, Jan - Santolík, Ondřej
Occurrence rate of EMIC wave event locations as a function of their distance to the magnetopause.
IUGG 2019 Abstract Book. Potsdam: International Union of Geodesy and Geophysics, 2019. IUGG19-0465.
[IUGG General Assembly /27./. 08.07.2019-18.07.2019, Montréal]
Institucionální podpora: RVO:68378289
Klíčová slova: magnetosphere * plasmapause * wave-particle interactions * EMIC waves * THEMIS spacecraft
Obor OECD: Fluids and plasma physics (including surface physics)
http://iugg2019montreal.com/abstract-book.html

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. The presentation of the EMIC occurrence rate is usually made with respect to the L-shell value of the observations. The L-shell value of the region adjacent to the magnetopause can vary by few Earth radii in respect with the solar pressure. In the present study we propose to represent the EMIC wave occurrence rate in the dayside magnetosphere with respect to the distance from the magnetopause. This study is based on the EMIC dataset (Usanova et al., 2012) observed by THEMIS spacecraft. The magnetopause position is estimated with the Shue et al. model (1998). The distance is taken from the projection of the spacecraft position on the magnetopause along the Sun-Earth direction. As EMIC wave events are investigated up to 10 Earth radii, we consider only EMIC events for which the projected spacecraft position is also found within this distance. The maximum of events is found within a distance to the magnetopause of two Earth radii.
Trvalý link: http://hdl.handle.net/11104/0299400