Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm44a..05p&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM44A-05
Physics
2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions, 7811 Discontinuities (2109), 7845 Particle Acceleration, 7851 Shock Waves (4455)
Scientific paper
ICME-magnetosphere-ionosphere interaction pays an important role in the energy and particle transfer in the solar wind-magnetosphere-ionosphere system. This talk presents a study of such an event on 6 November, 2001. A halo CME was observed by LASCO/SOHO at 1635 UT on 4 November 2001. About 33 hours later at 0153 UT on 6 November, the ICME and associated front shock arrived at the Earth orbit and caused a strong geomagnetic storm with Dst < -280nT, associated with a moderate ionospheric positive storm and 100 km uplift of the F-layer. Prior to the shock impact on the magnetopause, the Cluster four spacecraft were located in the duskside near-Earth tail close to the equator. Afterwards the spacecraft are meandering back and forth between the ICME and the magnetopause boundary layer. POLAR satellite was located near the inner boundary of the duskside plasma sheet. At 0154 UT the magnetosphere was greatly compressed, the Cluster spacecraft then moved out of the magnetosphere and stayed in the ICME until 0227 UT. During the crossing of the magnetopause, an O+ beam of 30 km/s mainly in the -Cx direction is observed. The number density of O+ reaches ~32/cm3, about three times larger than that of protons. The energy of O+ ions is ranged around a few keV to a couple of tens of keV. While in the ICME adjacent to the magnetopause, the bulk velocity of the O+ beam reduces to ~13 km/s, kinetic energy of ions is below 10-20 keV, with a peak pitch angle about 90o. During the same time period Polar in the inner plasma sheet observes a rapid increase of the O+ number flux with peak energy around 430 eV. FAST satellite below 2000 km altitude on the duskside of 19-21h MLT also sees an up-flowing O+ coics. It is also interesting to note that the left-hand polarized kinetic Alfven waves are excited near the magnetospheric boundary. The resonances between the kinetic Alfven waves and the beam particles lead to the pitch angle diffusion of resonant ions, forming a pick- up distribution of beam particles (Xiao et al., 2006). The relevant dynamical processes in the ICME- magnetosphere-ionosphere interaction are discussed.
Cao Xinwu
Fu Siqi
Ma Shiguang
Pu Zhang
Wang Jeffrey
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