On the absence of plasma wave emissions and the magnetic field orientation in the distant magnetosheath

Details On the absence of plasma wave emissions and the magnetic field orientation in the distant magnetosheath On the absence of plasma wave emissions and the magnetic field orientation in the distant magnetosheath

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2761c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 24, p. 2761-2764

Physics

2

Emission, Magnetic Fields, Magnetohydrodynamic Flow, Magnetosheath, Plasma Waves, Amplitudes, Field Aligned Currents, Graphs (Charts)

Scientific paper

In early September, 1983 ISEE-3 made a long traversal of the distant dawnside magnetosheath starting near x = -150 R(sub E) downstream. The distant magnetosheath often contains moderately intense plasma wave emissions at frequencies from several hundred Hz to 5 kHz. However, over time scales of many days, a clear correlation exists between the occurrence of the plasma waves and the cone angle (theta(sub xB)) between the magnetic field and the plasma flow velocity (x-direction). For theta(sub xB) large (small), the plasma wave amplitudes are near background (high). Sudden (less than 1 minute) changes in the local magnetic field orientation produce correspondingly sudden changes in the wave amplitudes. Statistically, the wave amplitudes decrease continuously with increasing theta(sub xB).

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