Energetic Particle Modulation by ULF waves in the inner magnetosphere

Details Energetic Particle Modulation by ULF waves in the inner magnetosphere Energetic Particle Modulation by ULF waves in the inner magnetosphere

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm41d..05z&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM41D-05

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2731 Magnetosphere: Outer, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 7852 Solitons And Solitary Waves (4455)

Scientific paper

One of most important questions in the Earth's radiation belt is to determine the dominant processes which accelerate magnetospheric several keV electrons to MeV energies. In particular recent studies have emphasized the question of the relative dominance of ULF and VLF wave acceleration processes across the outer belt. Energetic electron and ion flux and spectra variations associated with ULF waves in the inner magnetosphere have been examined by using Cluster spacecraft data. The quasi-periodic particle flux (electron 30 keV to 500 keV, proton 30 keV to 1.5 MeV) modulations are observed in the the region of L=5.3 to 11.7 at MLT=8. The relative phase of energetic electron and ion are different in the different location, also, depend on the energy of the particles. The particle fluxes were found to be either 90 or 270 out of phase with the magnetic variations. For the phase difference between the ion density and the magnetic variation, this argues that the time-average Poynting flux of the Pc5 wave along the ambient magnetic field is approximately zero, this indicates that Pc5 waves are standing waves along the field line. In-situ ULF measurements from inside geosynchros orbit are not commonly available. Multi-point measurements of the ULF wave electric and magnetic field morphology, as well as radiation belt particle flux, are made in this paper to examine the efficiency of the ULF process in the outer belt. Cluster constellation allow to determine wave coherence length and mode structure, which are critical parameters for determining the efficiency of the ULF wave drift-resonance interaction.

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