A statistical study of EMIC wave-associated He+ energization in the outer magnetosphere: Cluster/CODIF observations

Details A statistical study of EMIC wave-associated He+ energization in the outer magnetosphere: Cluster/CODIF observations A statistical study of EMIC wave-associated He+ energization in the outer magnetosphere: Cluster/CODIF observations

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm43c..06z&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM43C-06

Physics

Plasma Physics

[2731] Magnetospheric Physics / Magnetosphere: Outer, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

In the mission period of Mar. 2001 - Apr. 2008, the COmposition and DIstribution Function (CODIF) Analyzer on board Cluster observed 41 prolonged He+ energization events, lasting for about 1 to 5 hours. Those events occurred predominantly during quiet times, at low magnetic latitudes in the afternoon sector at L-values as large as 14.6. During the events, He+ ions resonantly interacted with electromagnetic ion cyclotron (EMIC) waves and were energized perpendicular to the magnetic field with energies up to 1 keV. Over the energy range of 0.04 - 1 keV the He+ comprised 75 - 95% of the total density. The associated EMIC waves obtained free energy from hot (2 - 40 keV), anisotropic H+. Quiet geomagnetic activity leads to an enhanced cold ion density and enhanced hot proton anisotropy in the outer magnetosphere. These are favorable conditions for the EMIC wave generation and thus the relevant He+ energization. Events (solid line) & corresponding magnetopause crossings (star) in the polar MLT-L coordinates
Events (solid line) & corresponding magnetopause crossings (star) in the GSE coordinates

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