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The interaction of a magnetic cloud with the Earth - Ionospheric convection in the Northern and Southern Hemispheres for a wide range of quasi-steady interplanetary magnetic field conditionsObservations are presented of the ionospheric convection in cross sections of the polar cap and auroral zone as part of the study of the interaction of the Earth's magnetosphere with the magnetic cloud of January 13-15, 1988. For strongly northward IMF, the convection in the Southern Hemisphere is characterized by a two-cell convection pattern comfined to high latitudes with sunward flow over the pole. The strength of the flows is comparable to that later seen under southward IMF. Superimposed on this convection pattern there are clear dawn-dusk asymmetries associated with a one-cell convection component whose sense depends on the polarity of the magnetic cloud's large east-west magnetic field component. When the cloud's magnetic field turns southward, the convection is characterized by a two-cell pattern extending to lower latitude with antisunward flow over the pole. There is no evident interhemispheric difference in the structure and strength of the convection. Superimposed dawn-dusk asymmetries in the flow patterns are observed which are only in part attributable to the east-west component of the magnetic field.
Document ID
19930053283
Document Type
Reprint (Version printed in journal)
Authors
Freeman, M. P. (NERC British Antarctic Survey, Cambridge, United Kingdom)
Farrugia, C. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Burlaga, L. F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hairston, M. R. (Texas Univ. Richardson, United States)
Greenspan, M. E. (Maryland Univ. College Park, United States)
Ruohoniemi, J. M. (Johns Hopkins Univ. Laurel, MD, United States)
Lepping, R. P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
May 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A5
ISSN: 0148-0227
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: F19628-90-K-0002
CONTRACT_GRANT: F19628-90-K-0003
Distribution Limits
Public
Copyright
Other