A study of MHD fluctuations upstream and downstream of quasi-parallel interplanetary shocks

Details A study of MHD fluctuations upstream and downstream of quasi-parallel interplanetary shocks A study of MHD fluctuations upstream and downstream of quasi-parallel interplanetary shocks

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.2243l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, March 1, 1987, p. 2243-2252. BMFT-supported research.

Physics

20

Diffusion Coefficient, Magnetoacoustic Waves, Magnetohydrodynamic Waves, Shock Waves, Error Analysis, Magnetic Spectroscopy, Power Spectra, Spectrum Analysis

Scientific paper

Power, coherence, magnetic, and cross-helicity spectra were employed to investigate the MHD fluctuations up to 1.44 hours upstream and downstream of three fast-forward, quasi-parallel (QP) shock waves. The spectral slopes and powers were found to vary significantly with the length of the data interval analyzed. Counterstreaming Alfven waves were identified immediately upstream and downstream of the QP, supercritical shock. Fast magnetoacoustic waves were identified upstream of the QP, subcritical shock and far upstream of the QP, supercritical shock coinciding with the inclusion of a small transverse discontinuity in the spectral analysis. Compressional turbulence not characteristic of either of the magnetoacoustic modes was observed downstream of the parallel, supercritical and quasi-parallel subcritical shocks. The determination of the parallel diffusion coefficient from power spectra of the observed magnetic field fluctuations is susceptible to major errors.

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