Inclinations of Large and Sharp Solar Wind Plasma Fronts

Details Inclinations of Large and Sharp Solar Wind Plasma Fronts Inclinations of Large and Sharp Solar Wind Plasma Fronts

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0490r&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0490

Physics

2109 Discontinuities, 2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence, 2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind

Scientific paper

The orientation of large and sharp increases or decreases of the solar wind ion flux was investigated using multispacecraft observations. Only events in which the ion flux changed by more than a factor of two in less than 10 minutes were taken into account. The orientation of these fronts was determined by analyzing the time delays between the arrival of the plasma fronts at two or more spacecraft in the solar wind. For this study we used simultaneous plasma measurements from INTERBALL-1, WIND, IMP 8 and Geotail. The time delays of the sharp fronts ranged from 1-20 min were observed after the advection shift due to the solar wind propagation time was removed. Using these delays, when we had data from 2 spacecraft we calculated the front orientation relative to the Sun-Earth line and when we had data from 3 (or 4) spacecraft we calculated the 3-D front orientation. The key hypothesis, that such fronts are planar over length scales of tens of Re, was checked by comparison of front angles when data from multiple spacecraft were available. Contrary to the common view, in most cases the planes of the plasma fronts are not perpendicular to the Sun-Earth line but are inclined to it by a significant value. The distribution of the inclinations is broad and for 50% of cases the angle between the plane of the front and the Sun-Earth line is less than 60 deg. (more than 30 deg. to the YseZse plane).

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