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Upstream pressure variations associated with the bow shock and their effects on the magnetosphereThe 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.
Document ID
19900043475
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fairfield, D. H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Baumjohann, W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Paschmann, G.
(Max-Planck-Institut fuer extraterrestrische Physik Garching, Federal Republic of Germany, United States)
Luehr, H.
(Braunschweig, Technische Universitaet Brunswick, Federal Republic of Germany, United States)
Sibeck, D. G.
(Johns Hopkins University Laurel, MD, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
90A30530
Distribution Limits
Public
Copyright
Other

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