Particles and waves Upstream of ICME Driven Interplanetary Shocks

Details Particles and waves Upstream of ICME Driven Interplanetary Shocks Particles and waves Upstream of ICME Driven Interplanetary Shocks

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh21b1930k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH21B-1930

Physics

[2101] Interplanetary Physics / Coronal Mass Ejections, [2139] Interplanetary Physics / Interplanetary Shocks, [2149] Interplanetary Physics / Mhd Waves And Turbulence, [2164] Interplanetary Physics / Solar Wind Plasma

Scientific paper

We use STEREO data to study interplanetary shocks driven by coronal mass ejections. We have found ultra-low frequency (ULF, f ~ 0.01 - 0.2 Hz) waves and high-frequency (HF, f ~ 1 Hz) fluctuations in regions upstream and downstream of these shocks. Some of the upstream HF fluctuations were classified as whistler waves. In the past whistler origin has been explained in terms of shock generation. The variety of waves found in the studied regions suggests that some of them may be generated by particle populations (electrons, ions) that can be unstable to different types of instabilities. In this work we study ions and electrons in regions immediately upstream of ten IP shocks of our sample. We use the STEREO SWEA data for electrons and STEREO PLASTIC data for ions. We study particle distributions in different points upstream of the shocks (anisotropies, temperatures, etc.) and investigate which of the observed waves can be generated by backstreaming particles.

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