Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..932..175m&link_type=abstract
TURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS; 6th Annual International Astrophysics Conference. AIP Conference P
Astronomy and Astrophysics
Astrophysics
1
Wave/Wave, Wave/Particle Interactions, Planetary Bow Shocks, Interplanetary Shocks
Scientific paper
Different types of backstreaming ion distributions have been reported in the region upstream from the Earth's bow shock and magnetically connected to it (ion foreshock): field-aligned beams (FABs), gyrating ion and diffuse ion distributions. Contrary to the first type, the two others are always associated with ULF waves. Among them, gyrating ions 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 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 FABs observed just both at the edge of the gyrating ions region and the boundary of ULF waves.
Le Queau Dominique
Mazelle Christian
Meziane Karim
Wilber M. M.
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