Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh31a0375s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH31A-0375
Physics
2154 Planetary Bow Shocks, 4455 Nonlinear Waves, Shock Waves, Solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7839 Nonlinear Phenomena (4400, 6944), 7852 Solitons And Solitary Waves (4455), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
Electrostatic solitary waves (ESW) are frequently observed in several regions such as the Earth's magnetotail, polar magnetosphere and bow shock transition. Matsumoto et al. (1994) showed electric field vector of ESW in the magnetotail is parallel to the ambient magnetic field. The ESW pulse corresponds to a single- humped electrostatic potential which is formed as the result of the bump-on-tail instability and propagate parallel to the ambient magnetic field. Several types of ESW are also observed in the Earth's foreshock region. These ESW are simultaneously observed with non-thermal electrons or ions reflected by the bow shock. Furthermore, we observed ESW which have oblique potential structures with reference to the ambient magnetic field in the foreshock region. In order to understand the wave features of ESW observed in the foreshock region, we conducted the waveform and statistical analysis using wave form capture (WFC) data onboard the Geotail spacecraft. Since the Geotail spacecraft crosses the bow shock two times a week on its orbit since November 1994, there exist a plenty of data sets, which are very suitable for the present analyses. The results of the statistical analysis show that ESW with oblique potential structure are frequently observed vicinity of the bow shock, and the occurrence of those decreases as the distance from the bow shock increase. We conceive that generation of these ESW is highly dependent on bow shock conditions. In the present paper, we discuss the characteristics of ESW with specific potential structure based on the observation results in the Earth's foreshock region.
Kojima Hedeyasu
Matsumoto Haru
Shin Kyusoon
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