Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51c1419m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51C-1419
Physics
2134 Interplanetary Magnetic Fields, 2154 Planetary Bow Shocks, 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7839 Nonlinear Phenomena (4400, 6944), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
In the Earth's foreshock, backstreaming gyrating ion distributions with well-defined pitch-angle and gyrophase organization around the local magnetic field have been frequently observed in association with large amplitude quasi-monochromatic right-hand mode low-frequency waves. These waves reveal the existence of coherent wave-particle interaction which is an efficient process to dissipate the energy of the particles reflected at the collisionless bow shock. It has been shown recently from a large data set from multi-spacecraft observations by Cluster that the gyrophase-bunched ion distributions are mainly produced by such a process from cyclotron-resonant field-aligned beams (FABs) observed just both at the edge of the gyrating ions region and the boundary of ULF waves. The parallel and perpendicular velocities of the gyrophase-bunched ion beams have been used to qualify a theoretical model of nonlinear "pitch-angle" trapping by the waves. We present a detailed analysis of the reduced parallel and perpendicular distributions. It reveals that they are not Maxwellian and often exhibit a well-developed high energy tail. The same property has been reported recently for on some FAB distributions. Results of the analysis of the characteristics of the gyrating ion distributions and the role of local geometrical conditions are discussed and compared to the results for the FABs.
Attie R.
Hamza Alex
Lucek Elizabeth
Mazelle Christian
Meziane Karim
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