Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm51c0386m&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM51C-0386
Physics
7839 Nonlinear Phenomena, 7867 Wave/Particle Interactions, 2116 Energetic Particles, Planetary, 2134 Interplanetary Magnetic Fields, 2154 Planetary Bow Shocks
Scientific paper
Gyrating backstreaming ions displaying gyrophase-bunching around the local magnetic field are frequently observed upstream of the Earth's bow shock. These ions are always associated with quasi-monochromatic right-hand mode low-frequency waves. Previously some case studies have been made to explain these ion features. The proposed mechanism is either a non-local production by a specular reflexion at the bow shock itself or a local nonlinear wave- particle interaction involving initially field-aligned beam ions and the waves. From a much larger data set now available, the physical properties of the gyrophase-bunched ions can be determined by sophisticated mathematical methods allowing to fit distributions without the maxwellian assumption. These derived properties are used to test and discriminate the two possible production mechanisms proposed. A strong emphasis is put on the association with field-aligned beams given from multi-spacecraft observations by Cluster.
Eastwood Jonathan P.
Le Queau Dominique
Mazelle Christian
Meziane Karim
Parks George K.
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