Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98..187s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A1, p. 187-196.
Physics
22
Geomagnetic Micropulsations, Interplanetary Magnetic Fields, Magnetic Flux, Magnetopause, Space Plasmas, Wave Propagation, International Sun Earth Explorers, Plasma Sheaths
Scientific paper
Strong slow mode waves in the Pc 3-4 frequency range are found in the magnetosheath close to the magnetopause. We have studied these waves at one of the ISEE subsolar magnetopause crossings using the magnetic field, electric field, and plasma measurements. We use the pressure balance at the magnetopause to calibrate the Fast Plasma Experiment data versus the magnetometer data. When we perform such a calibration and renormalization, we find that the slow mode structures are not in pressure balance and small scale fluctuations in the total pressure still remain in the Pc 3-4 range. Energy in the total pressure fluctuations can be transmitted through the magnetopause by boundary motions. The Poynting flux calculated from the electric and magnetic field measurements suggests that a net Poynting flux is transmitted into the magnetopause. The two independent measurements show a similar energy transmission coefficient. The transmitted energy flux is about 18 percent of the magnetic energy flux of the waves in the magnetosheath. Part of this transmitted energy is lost in the sheath transition layer before it enters the closed field line region. The waves reaching the boundary layer decay rapidly. Little wave power is transmitted into the magnetosphere.
Anderson Rachel
Cattell Cynthia A.
Fitzenreiter Richard J.
Russell Christopher T.
Song Paul
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