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Global multispectral auroral imaging of an isolated substorm

Publication ,  Journal Article
Cummer, SA; Vondrak, RR; Ostgaard, N; Stadsnes, J; Bjordal, J; Chenette, DL; Brittnacher, MJ; Parks, GK; Sigwarth, JB; Frank, LA
Published in: Geophysical Research Letters
March 1, 2000

We analyze simultaneous visible, ultraviolet (UV), and X-ray auroral images of an isolated substorm on January 25, 1998. The total precipitating electron energy flux and mean energy extracted near substorm maximum from each of the imagers are in acceptable agreement. The expansion phase visible, UV, and X-ray emissions are morphologically similar, with the brightest emissions coming from the auroral surge. However, during the recovery phase, there are regions of bright X-ray emissions near local midnight and dawn that do not correspond to obvious features in the visible and UV images. X-ray energy analysis in these regions reveals a high energy (˜30-100 keV) component of the precipitating electron population that contributes ˜30% of the total electron energy flux. The temporal development of the X rays indicates that the dawn emissions originate in a drifting electron population, while the newly revealed midnight emissions originate in a continuous injection of energetic electrons in a narrow local time region.

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Published In

Geophysical Research Letters

DOI

ISSN

0094-8276

Publication Date

March 1, 2000

Volume

27

Issue

5

Start / End Page

637 / 640

Related Subject Headings

  • Meteorology & Atmospheric Sciences
 

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Cummer, S. A., Vondrak, R. R., Ostgaard, N., Stadsnes, J., Bjordal, J., Chenette, D. L., … Frank, L. A. (2000). Global multispectral auroral imaging of an isolated substorm. Geophysical Research Letters, 27(5), 637–640. https://doi.org/10.1029/1999GL011200
Cummer, S. A., R. R. Vondrak, N. Ostgaard, J. Stadsnes, J. Bjordal, D. L. Chenette, M. J. Brittnacher, G. K. Parks, J. B. Sigwarth, and L. A. Frank. “Global multispectral auroral imaging of an isolated substorm.” Geophysical Research Letters 27, no. 5 (March 1, 2000): 637–40. https://doi.org/10.1029/1999GL011200.
Cummer SA, Vondrak RR, Ostgaard N, Stadsnes J, Bjordal J, Chenette DL, et al. Global multispectral auroral imaging of an isolated substorm. Geophysical Research Letters. 2000 Mar 1;27(5):637–40.
Cummer, S. A., et al. “Global multispectral auroral imaging of an isolated substorm.” Geophysical Research Letters, vol. 27, no. 5, Mar. 2000, pp. 637–40. Scopus, doi:10.1029/1999GL011200.
Cummer SA, Vondrak RR, Ostgaard N, Stadsnes J, Bjordal J, Chenette DL, Brittnacher MJ, Parks GK, Sigwarth JB, Frank LA. Global multispectral auroral imaging of an isolated substorm. Geophysical Research Letters. 2000 Mar 1;27(5):637–640.
Journal cover image

Published In

Geophysical Research Letters

DOI

ISSN

0094-8276

Publication Date

March 1, 2000

Volume

27

Issue

5

Start / End Page

637 / 640

Related Subject Headings

  • Meteorology & Atmospheric Sciences