IMF cone angle control of the magnetopause location: Statistical study

Details IMF cone angle control of the magnetopause location: Statistical study IMF cone angle control of the magnetopause location: Statistical study

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3719103d&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 19, CiteID L19103

Physics

1

Magnetospheric Physics: Magnetopause And Boundary Layers, Interplanetary Physics: Interplanetary Magnetic Fields

Scientific paper

We investigate the dependence of the magnetopause location on the interplanetary magnetic field (IMF) cone angle (the angle between the IMF and solar wind velocity vectors) in a statistical study based on ≈6500 magnetopause crossings observed by the five THEMIS spacecraft, both at the dayside and flanks. To remove other well-known effects, we analyze the difference between observed magnetopause radial distances and those predicted by an empirical magnetopause model (scalable by the solar wind dynamic pressure and IMF BZ component). The results demonstrate a systematic increase of the magnetopause distance for radial IMF directions, from ≈0.3 RE at 90° to ≈1.7 RE at 0° or 180° cone angle. Moreover, a stronger dependence of the magnetopause location on the solar wind dynamic pressure than predicted by the current models was observed.

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