Impulse-excited pulsations during the July 29, 1977, event

Details Impulse-excited pulsations during the July 29, 1977, event Impulse-excited pulsations during the July 29, 1977, event

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.5911n&link_type=abstract

Journal of Geophysical Research, vol. 87, Aug. 1, 1982, p. 5911-5916.

Computer Science

Sound

30

Geomagnetic Micropulsations, Magnetohydrodynamic Waves, Magnetospheric Instability, Shock Wave Propagation, Solar Wind, Sudden Storm Commencements, Compression Waves, Magnetic Equator, Resonance, Satellite Sounding, Shock Discontinuity, Solar Terrestrial Interactions

Scientific paper

The propagation of a geomagnetic sudden impulse (si) and the magnetic field pulsations excited by it in the magnetosphere is traced from the bow shock in the solar wind, through the magnetosphere, to the ground. Within the magnetosphere the impulse appears as a compressive MHD impulse that travels rapidly tailward. A resonant oscillation observed both in space and on the ground is excited near geostationary orbit. The effect of the si is enhanced by a factor of at least five on the ground near the geomagnetic equator. It is suggested that discontinuities in the solar wind may be a more important source of exciting dayside pulsations than has been commonly assumed.

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