Study of waves in the regions upstream and downstream of interplanetary shocks

Details Study of waves in the regions upstream and downstream of interplanetary shocks Study of waves in the regions upstream and downstream of interplanetary shocks

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh23b1864k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH23B-1864

Physics

[2101] Interplanetary Physics / Coronal Mass Ejections, [2134] Interplanetary Physics / Interplanetary Magnetic Fields, [2139] Interplanetary Physics / Interplanetary Shocks, [2149] Interplanetary Physics / Mhd Waves And Turbulence

Scientific paper

In the last year the solar activity began to increase as part of solar cycle 24, and interplanetary coronal mass ejections (ICMEs) have been observed propagating in the solar wind. Fast ICMEs are able to drive transient shocks in the interplanetary medium. These shocks in turn are able to modify the plasma properties around them. In this work we use STEREO magnetic field data at a high resolution (8 Hz in the continous mode), to study the ultra-low frequency waves that populate the regions upstream and donwstream of the transient IP shocks driven by ICMEs. We calculate their power spectra and determine their degree of compressibility, polarization, direction of propagation, etc. We also study the connection between the observed waves and the shock parameters, such as Mach number, whether it is subcritical or supercritical and the shock geometry defined by the angle between the shock normal and the interplanetary field.

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