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Title: Latitudinal variation of the polar cusp during a geomagnetic storm

Abstract

Large amplitude latitudinal variation of the polar cusp position was observed during the intense geomagnetic storm of 15--16 February 1980. The observation of the polar cusp, identified as the region of intense but extremely soft electron precipitation, was made by two nearly noon-midnight orbit DMSP satellites over both northern and southern hemispheres. The latitudinal shift of the polar cusp is observed to be related to the intensity variation of the ring current indicated by the hourly Dst values. The polar cusp region moved from its normal location at approx.76/sup 0/ gm lat down to approx.62/sup 0/ gm lat at the peak of this storm. This movement took about 5 hours and was detected over both hemispheres. A drastic variation in the width of the cusp region was also observed; it is very narrow (approx.1/sup 0/) during the equatorial shift and expands to > or approx. =5/sup 0/ during the poleward recovery. Variation of the polar cusp latitude with that of the Dst index was also seen during the period before the intense storm.

Authors:
Publication Date:
Research Org.:
The Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland 20707
OSTI Identifier:
5384087
Resource Type:
Journal Article
Journal Name:
Geophys. Res. Lett.; (United States)
Additional Journal Information:
Journal Volume: 9:1
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; POLAR CUSP; LATITUDE EFFECT; MAGNETIC STORMS; ELECTRON PRECIPITATION; IONOSPHERE; MAGNETOSPHERE; RING CURRENTS; CHARGED-PARTICLE PRECIPITATION; CURRENTS; EARTH ATMOSPHERE; ELECTRIC CURRENTS; GEOGRAPHICAL VARIATIONS; PLANETARY IONOSPHERES; VARIATIONS; 640201* - Atmospheric Physics- Auroral, Ionospheric, & Magetospheric Phenomena

Citation Formats

Meng, C. Latitudinal variation of the polar cusp during a geomagnetic storm. United States: N. p., 1982. Web. doi:10.1029/GL009i001p00060.
Meng, C. Latitudinal variation of the polar cusp during a geomagnetic storm. United States. https://doi.org/10.1029/GL009i001p00060
Meng, C. 1982. "Latitudinal variation of the polar cusp during a geomagnetic storm". United States. https://doi.org/10.1029/GL009i001p00060.
@article{osti_5384087,
title = {Latitudinal variation of the polar cusp during a geomagnetic storm},
author = {Meng, C},
abstractNote = {Large amplitude latitudinal variation of the polar cusp position was observed during the intense geomagnetic storm of 15--16 February 1980. The observation of the polar cusp, identified as the region of intense but extremely soft electron precipitation, was made by two nearly noon-midnight orbit DMSP satellites over both northern and southern hemispheres. The latitudinal shift of the polar cusp is observed to be related to the intensity variation of the ring current indicated by the hourly Dst values. The polar cusp region moved from its normal location at approx.76/sup 0/ gm lat down to approx.62/sup 0/ gm lat at the peak of this storm. This movement took about 5 hours and was detected over both hemispheres. A drastic variation in the width of the cusp region was also observed; it is very narrow (approx.1/sup 0/) during the equatorial shift and expands to > or approx. =5/sup 0/ during the poleward recovery. Variation of the polar cusp latitude with that of the Dst index was also seen during the period before the intense storm.},
doi = {10.1029/GL009i001p00060},
url = {https://www.osti.gov/biblio/5384087}, journal = {Geophys. Res. Lett.; (United States)},
number = ,
volume = 9:1,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1982},
month = {Fri Jan 01 00:00:00 EST 1982}
}