Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52a0540s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM52A-0540
Physics
2164 Solar Wind Plasma, 2728 Magnetosheath, 2752 Mhd Waves And Instabilities, 2772 Plasma Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Large amplitude plasma and magnetic field ULF waves are typical features in the foreshock and in the magnetosheath but the relationship between the waves in each region is not understood. We investigated ULF plasma and magnetic field waves using simultaneous measurements from the solar wind near the bow shock and from the magnetosheath using the INTERBALL-1, IMP 8 and GEOTAIL spacecraft. Plasma and magnetic field data with time resolution up to 1/16 s were used. We have found significant difference in the properties of ULF waves in the foreshock and magnetosheath. Ion flux and magnetic field magnitude variations in the foreshock are strongly positive correlated (consistent with fast magnetosonic waves) whereas in the magnetosheath such correlations are weak and sometimes negative. Power spectra of the ion flux and magnetic field variations in the range from 0.0002 to 5 Hz in the foreshock are very similar and their slope (especially in the high frequency part of this range) is significantly steeper than power spectra of magnetosheath data. Both case studies and statistical studies show that the amplitude of ULF waves in the magnetosheath strongly depends on the type of the bow shock. The amplitudes of the plasma and magnetic field variations behind quasi-parallel bow shocks are on average about two times larger than those behind quasi-perpendicular shocks.
Eiges P. E.
Nozdrachev M. N.
Richardson John D.
Shevyrev N. N.
Zastenker Georgy N.
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