Observations of solar wind pressure initiated fast mode waves at geostationary orbit and in the polar cap

Details Observations of solar wind pressure initiated fast mode waves at geostationary orbit and in the polar cap Observations of solar wind pressure initiated fast mode waves at geostationary orbit and in the polar cap

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..231e&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 53, Mar.-Apr. 1991, p. 231-239.

Physics

19

Earth Magnetosphere, Goes Satellites, Plasma Pressure, Polar Caps, Solar Wind, Stationary Orbits, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Solar Terrestrial Interactions, Viking Spacecraft

Scientific paper

This study involves a multisatellite investigation of magnetic field perturbations in the magnetosphere due to solar wind dynamic pressure variations. The case study uses data acquired on August 3, 1986 from IMP-8, GOES-5, GOES-6, VIKING, and ground magnetograms. As expected, dramatic solar wind dynamic pressure variations, recorded at IMP-8, produced compressions and rarefactions of the magnetosphere as seen in GOAS-5 and GOES-6 magnetic field observations at geostationary orbit. These same compressions and rarefactions were also recorded by the VIKING magnetic field experiment over the polar cap at midlatitudes. The magnetic field perturbations are interpreted in terms of fast mode waves which were generated near the magnetopause and propagate antisunward into the inner magnetosphere. In addition, the amplitude of the magnetic field perturbations recorded at geostationary orbit and VIKING is compared. The wave amplitudes recorded by GOES and VIKING were nearly identical, suggesting a low damping rate of the waves in the magnetosphere.

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