Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1762z&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1762
Physics
2731 Magnetosphere: Outer, 2740 Magnetospheric Configuration And Dynamics, 2772 Plasma Waves And Instabilities (2471), 2780 Solar Wind Interactions With Unmagnetized Bodies, 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
It is well known that He+ can be resonantly energized by the electromagnetic ion cyclotron (EMIC) waves in the magnetosphere. The presence of both anisotropic energetic protons and heavy He+ ions is believed to be an important condition of the generation and propagation of the EMIC waves and the wave- particle interactions near the He+ gyrofrequency. From January 2001 to April 2008, the Composition and Distribution Function (CODIF) Analyzer on board the Cluster satellites observed 41 He+ energization events. In this study, we performed a statistical study of these He+ energization intervals. We report the statistical location of the intervals and the typical properties of H+ and the thermalizated He+ ions. In addition, the statistical results of the solar wind/interplanetary magnetic field (IMF) conditions and the levels of geomagnetic activity during the intervals are also presented.
Dunlop Malcolm W.
Kistler Lynn M.
Klecker Berndt
Mouikis C. G.
Sauvaud J. J.
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