A case study of CME-magnetosphere interaction at the magnetopause boundary

Details A case study of CME-magnetosphere interaction at the magnetopause boundary A case study of CME-magnetosphere interaction at the magnetopause boundary

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm54a..04p&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM54A-04

Physics

2724 Magnetopause And Boundary Layers, 2731 Magnetosphere: Outer, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Arrival of ICME at the Earth orbit usually leads to strong geomagnetic storms and space weather in the inner magnetosphere; it also causes strong solar wind -magnetosphere interaction in the magnetopause boundary layers. Such an interaction may pay an important role in the energy transfer and particle exchange across the magnetopause. Here we report a fortuitous Cluster observation of the ICME-magnetosphere interaction on November 6, 2001, when an earth-directed halo CME associated with a front shock and a magnetic cloud impacted the magnetopause. The Cluster four spacecraft were located in the duskside magnetopause boundary layer southward of but very near to the equator. We first review our previous results of wave excitation and wave- particle resonance studies (Xiao et al., 2006). It was found that left-hand polarized kinetic Alfven waves were generated and that the resonance between these waves and ions leads to the pitch angle diffusion of resonant particles, forming a monospheric distribution. We then focus on the behaviors of ionosphere originated O+ ions during the ICME-magnetosphere interaction. It is shown that the O+ ions of a few keV are rapidly energized up to a few tens of keV. The pitch-angle distribution is quickly changed from field-aligned dominated to nearly isotropic with maximum around 90 degree. An O+ beam of 30 km/s mainly in the ¡§Cx and ¡§Cy direction is also formed. The relevant dynamical processes are discussed.

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