Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.3762v&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, June 1, 1984, p. 3762-3774.
Physics
54
Interplanetary Space, Magnetohydrodynamic Waves, Shock Waves, Space Plasmas, Spectrum Analysis, Magnetohydrodynamic Stability, Power Spectra, Voyager 1977 Mission
Scientific paper
Preliminary results of an investigation of magnetic fluctuations seen upstream of two interplanetary shocks are presented. The spectral analysis includes calculation of the normalized reduced magnetic helicity spectrum, the normalized reduced cross-helicity spectrum, and the Alfven ratio as discussed by Matthaeus and Goldstein (1982). Minimum variance methods are used to compute wave polarization as a function of frequency. The Taylor 'frozen in flow' hypothesis is assumed to convert frequencies to wave vectors. Some of the basic properties of the waves, including the probable mode of propagation in association with both quasi-parallel forward and reverse shocks, are described. A comparison with previous results on the generation of waves at interplanetary and planetary shocks is presented.
Acuña Mario Humberto
Goldstein Michel L.
Viñas Adolfo F.
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