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Electron and Proton Auroral DynamicsData from the Wide-band Imaging Camera (WIC) sensitive to far ultraviolet auroras and from the Spectrographic Imager (SI) channel SI12, sensitive to proton precipitation induced Lyman alpha were analyzed during a high altitude orbit segment of the IMAGE spacecraft. This segment began during the expansive phase of a substorm. The aurora changed into a double oval configuration, consisting of a set of discrete pole-ward forms and a separate diffuse auroral oval equatorwards, Although IMF Bz was strongly southward considerable activity could be seen poleward of the discrete auroras in the region that was considered to be the polar cap. The SI12 Doppler shifted Lyman alpha signature of precipitating protons show that the proton aurora is on the equatorward side of the diffuse aurora. In the following several hours the IMF Bz field changed signed. Although the general character of the proton and electron aurora did not change, the dayside aurora moved equatorward when the Bz was negative and more bright aurora was seen in the central polar cap during periods of positive Bz.
Document ID
20010021591
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Mende, S. B.
(California Univ. Berkeley, CA United States)
Frey, H. U.
(California Univ. Berkeley, CA United States)
Gerard, J. C.
(Liege Univ. Belgium)
Hubert, B.
(Liege Univ. Belgium)
Fuselier, S.
(Lockheed Martin Palo Alto Research Lab. Palo Alto, CA United States)
Spann, J. F., Jr.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Gladstone, R.
(Southwest Research Inst. San Antonio, TX United States)
Burch, J. L.
(Southwest Research Inst. San Antonio, TX United States)
Rose, M. Franklin
Date Acquired
August 20, 2013
Publication Date
January 1, 2000
Subject Category
Geophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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