Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm13b1812n&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM13B-1812
Physics
[2724] Magnetospheric Physics / Magnetopause And Boundary Layers
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 degree to ~ 1.7 Re at 0 degree or 180 degree cone angle. Moreover, a stronger dependence of the magnetopause location on the solar wind dynamic pressure than predicted by the current models was observed. Finally, we discuss the dependence of other quantities after removing of well-known influences as an ecliptic IMF angle, solar wind speed and density, upstream plasma beta, tilt angle, and geomagnetic indices.
Dušík Štefan
Granko G.
Jelínek Karel
Nemecek Zdenek
Safrankova Jana
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