EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Imhof et al. 1985
Imhof, W.L., Voss, H.D., Datlowe, D.W. and Mobilia, J. (1985). Bremsstrahlung x ray images of isolated electron patches at high latitudes. Journal of Geophysical Research 90: doi: 10.1029/JA090iA07p06515. issn: 0148-0227.

Small isolated patches of energetic electron precipitation have been observed at high latitudes with a bremsstrahlung X ray imager in the Stimulated Emission of Energetic Particles (SEEP) payload on the polar-orbiting S81-1 satellite. Twenty-nine patches of X rays (>4 keV) with typical widths of ~200 km were observed in June 1982 at invariant latitudes between 65¿ and 83¿ with a median latitude of 72.5¿ The majority of X ray patches occurred from dusk until dawn, but a few were present in the early afternoon hours. The observed energy spectra were relatively soft (e fold energies about 1--6 keV) and independent of invariant latitude, magnetic local time, or geomagnetic activity. The occurrence frequency of the patches was somewhat greater at times of high geomagnetic activity. The patches were usually oblong by factors up to 3.7, with a median value of 1.75. No strongly preferred alignment was found. Comparisons of the direct electron measurements and the X ray observations from the same satellite have shown that in some cases the small isolated patches of electron precipitation at high latitudes may undergo significant changes in position on time scales of the order of a few seconds.

BACKGROUND DATA FILES

Abstract

Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit