Exploring the Evidence of Particle-Wave Coupling in the Distant Upstream Ion-Foreshock

Details Exploring the Evidence of Particle-Wave Coupling in the Distant Upstream Ion-Foreshock Exploring the Evidence of Particle-Wave Coupling in the Distant Upstream Ion-Foreshock

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh33a1198f&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH33A-1198

Physics

7811 Discontinuities, 2116 Energetic Particles, Planetary, 2139 Interplanetary Shocks, 2149 Mhd Waves And Turbulence

Scientific paper

We discuss the far ion foreshock for cases when the interplanetary magnetic field (IMF) is approximately parallel to the supersonic motion of the solar wind plasma. Several events have been identified of an enhanced ultra low frequency wave activity in the presence of an ion foreshock composed by (1) a beam (low energy <4keV), (2) a transverse population to the IMF ("intermediate" energy, from 5 to 40 keV), and (3) an isotropic population ("high" energy end, from 40 to 140 keV). This observations took place up to 250 RE upstream of the Earth (Berdichevsky et al., 1999ª). Here we study the frequency content, the polarization and the particle-wave coupling using a cross-spectrum analysis. We do a qualitative analysis of the origin of this wave-activity using the linear theory of plasma instabilities and explore the possibility of trapping of these strongly scattered particle fluxes. In this study we present results for observations on June 11, July 13, and Aug 25, 1995. For the study we use sampling times of waves and electron data of 12 sec or higher resolution energetic particle data. Solar wind plasma and magnetic field are collected by the MFI, SWE, WAVES, and 3DP instruments on Wind, and MGF and EPIC in GEOTAIL spacecraft. The spectral technique used is based on a set of Intrinsic Modes resulting from an Empirical Decomposition Method. Berdichevsky D. et al., 1999, J. Geophys. Res., 104, No A1, 463

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