Inverse magnetic field gradient across the magnetopause: Multipoint study

0504214 - ÚFA 2020 DE eng A - Abstract
Grygorov, K. - Němeček, Z. - Šafránková, J. - Šimůnek, Jiří
Inverse magnetic field gradient across the magnetopause: Multipoint study.
Geophysical Research Abstracts. Vol. 21. Göttingen: European Geosciences Union, 2019. EGU2019-9564.
[EGU General Assembly 2019. 07.04.2019-12.04.2019, Vienna]
Institutional support: RVO:68378289
Keywords : magnetopause * magnetic field gradient * THEMIS spacecraft
OECD category: Astronomy (including astrophysics,space science)
https://meetingorganizer.copernicus.org/EGU2019/EGU2019-9564.pdf

The magnetopause is a layer where the pressure of the magnetospheric magnetic field balances with the magnetosheath one (a sum of thermal and magnetic pressures). However, statistics of THEMIS magnetopause crossings has shown that about 1 % of them exhibit a larger magnetic field in the magnetosheath than in the magnetosphere. These crossings seem to appear predominantly on the flanks under a southward IMF during disturbed magnetospheric conditions. In the study, we accompanied THEMIS crossings with nearly simultaneously observed crossings by other spacecraft (Cluster, MMS) and by the spacecraft within the magnetosphere on the day/night side together with geomagnetic indices to monitor a possible response of a whole magnetosphere. We provide a small statistical study of both types of crossings and compare them with empirical magnetopause models.
Permanent Link: http://hdl.handle.net/11104/0295903