The Possible Source of the Short Quasi-Harmonical Structures in the Earth's Foreshock

Details The Possible Source of the Short Quasi-Harmonical Structures in the Earth's Foreshock The Possible Source of the Short Quasi-Harmonical Structures in the Earth's Foreshock

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh72a0546e&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH72A-0546

Physics

2116 Energetic Particles, Planetary, 2118 Energetic Particles, Solar, 2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence

Scientific paper

Presence of accelerated ("reflected") particles propagating upstream from the shock front and wave modes generated in wide range of frequencies and amplitudes is the major characteristic feature of the foreshock. High time resolution plasma and magnetic field measurements made onboard INTERBALL-1 satellite during Earth's foreshock crossings allowed us to obtain information about interrelation between these accelerated particles and the waves in a very small time scale (few tens of seconds). Namely, the quasi-harmonical structures with a period of a few seconds and duration up to half of minute observed in the foreshock simultaneously in the magnetic field and solar wind ion flux data were compared with the features of accelerated particles. Dozens of such events were studied. In order to determine possible "trigger" or "cause" of these quasi-harmonical structures 3D distribution functions of accelerated ions in the foreshock were reconstructed on 10 sec. intervals. Almost all cases clearly demonstrate a presence of narrow additional beam of particles just before the occurrence of quasi-harmonical structure. This beam commonly propagates at some significant angle to the background magnetic field direction. Basic parameters of these beams were also calculated in each case and then statistically processed to determine their average values for several types of quasi-harmonical foreshock structures.

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