A Study of Nonlinear MHD Wave Behavior Upstream of the Earth's Bow Shock

Details A Study of Nonlinear MHD Wave Behavior Upstream of the Earth's Bow Shock A Study of Nonlinear MHD Wave Behavior Upstream of the Earth's Bow Shock

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.0801l&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #08.01; Bulletin of the American Astronomical Society, Vol. 24, p.739

Astronomy and Astrophysics

Astronomy

Scientific paper

Twenty episodes of magnetohydrodynamic wave activity in the Earth's ion foreshock region have been analyzed. Data collected from instruments aboard the ISEE2 spacecraft was used to examine the ~ 0.02 Hz waves in this region. Fluctuations in the the electron density and magnetic field were analyzed to identify the various linear and nonlinear plasma processes that may be occuring. Correlations and cross-spectra between the density and various magnetic field components were performed. One major finding is that the fluctuating component of the magnetic field parallel to the mean field is strongly correlated with the density fluctuations over a wide variety of scales. In addition, two distinct wave populations were seen to exist. We have interpreted this as being the result of nonlinear parametric instabilities acting on obliquely propagating MHD waves.

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