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Geomagnetopause Position and Shape Dependence on Solar Wind Plasma and IMF Parameters: Analytic Model Comparison with Observations and 3-D MHD Runs

Published online by Cambridge University Press:  24 July 2018

M. I. Verigin ,
G. A. Kotova Open the ORCID record for G. A. Kotova [Opens in a new window]  and
V. V. Bezrukikh
M. I. Verigin
Affiliation:
Space Research Institute of Russian Academy of Sciences, Profsoyuznaya, 84/32, Moscow, 117997, Russia, email: verigin@iki.rssi.ru
G. A. Kotova
Affiliation:
Space Research Institute of Russian Academy of Sciences, Profsoyuznaya, 84/32, Moscow, 117997, Russia, email: verigin@iki.rssi.ru
V. V. Bezrukikh
Affiliation:
Space Research Institute of Russian Academy of Sciences, Profsoyuznaya, 84/32, Moscow, 117997, Russia, email: verigin@iki.rssi.ru
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Abstract

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It is generally accepted to use the solar wind ram pressure ρV2 and the IMF Bz component for empirical description of the geo-magnetopause position and shape. A specific feature of the present paper is not to use the solar wind ρV2 but the thermal Pth and magnetic field Pmag pressures adjacent to the magnetopause for proper modelling. These pressures are deduced from the results of 3-D MHD runs and analytic solutions for post bow shock MHD flow in Lagrangian variables. The magnetopause shape variation due to Bz component changes the so called ‘doubling factor’ fd, which can be analytically deduced from a Tsyganenko magnetospheric field ellipsoidal model. Including all the above effects in our analytical model leads to a good description of ‘rapid’ magnetopause approach to the Earth for southward IMF and to its ‘stagnant’ behaviour with the increase of northward IMF component.

Keywords

Magnetopausesolar wind ram pressuremagnetic and thermal pressuredoubling factor
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S335: Space Weather of the Heliosphere: Processes and Forecasts , July 2017 , pp. 121 - 124
Copyright
Copyright © International Astronomical Union 2018 

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