Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh32d..03w&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH32D-03
Physics
2118 Energetic Particles, Solar, 2154 Planetary Bow Shocks
Scientific paper
We report on observations by Cluster of two simultaneous upstream ion populations in oblique to quasi-parallel geometries, while the spacecraft were near (probably <= 1 Re) the bow shock. One stable ~1--4 keV component can be seen to gyrate with small pitch angles, while a second, previously un-reported, 10--20 keV population gyrates with much larger pitch angles. A representative case on 23 April 2001 showed a 3--4 keV field-aligned beam change to a 1 keV population having field-aligned velocities 40% lower and pitch angles of ˜~15o. This change occurred as the IMF rotated 10 degrees, producing a transition from an estimated shock geometry of θ Bn ˜~45o degrees to θ Bn ˜~ 36o. The IMF also changed from being very steady to supporting large ULF waves. As the wave amplitudes reached peak values, a 20 keV gyrating component emerged, and this was observed to have pitch-angles of 60--80 degrees, and a narrow spread in gyrophase. After briefly presenting these and similar observations, we will discuss possible sources/mechanisms leading to the emergence of the simultaneous energetic component.
Bavassano-Cattaneo M. B.
Bosqued J.
Dandouras Iannis
Hull Arthur J.
Kistler Lynn M.
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