Upstream pressure variations associated with the bow shock and their effects on the magnetosphere

Details Upstream pressure variations associated with the bow shock and their effects on the magnetosphere Upstream pressure variations associated with the bow shock and their effects on the magnetosphere

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3773f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 3773-3786.

Other

110

Bow Waves, Earth Magnetosphere, Pressure Distribution, Shock Waves, Solar Terrestrial Interactions, Solar Wind Velocity, Ampte (Satellites), Goes Satellites, Magnetic Field Configurations, Polar Cusps

Scientific paper

The AMPTE IRM solar wind data are analyzed to determine the relationship between upstream pressure fluctuations and magnetospheric perturbations. It is argued that the upstream pressure variations are not inherent in the solar wind but rather are associated with the bow shock. This conclusion follows from the fact that the upstream field strength and density associated with perturbations are highly correlated with each other, while they tend to be anticorrelated in the undisturbed solar wind, and that the upstream perturbations occur within the foreshock or at its boundary. The results imply a mode of interaction between the solar wind upstream and the magnetosphere whereby density changes produced in the foreshock subsequently convect through the bow shock and impinge on the magnetosphere. Upstream pressure perturbations should create significant effects on the magnetopause and at the foot of nearby field lines that lead to the polar cusp ionosphere.

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