Physics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..457r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 457-466. Research supported by the Lockheed Independ
Physics
9
Auroral Spectroscopy, Incoherent Scatter Radar, Photometry, Radar Measurement, Radio Auroras, Alaska, All Sky Photography, Electron Density Profiles, Electron Energy, Latitude, Vertical Distribution
Scientific paper
On the evening of March 5, 1981, an intense, type A red aurora appeared over southern Alaska. Radar and photometric measurements were made of the aurora from the Chatanika radar site. The line of sight intensity of the 630.0-nm emissions exceeded 150 kR and was accompanied by enhanced emissions at 486.1 and 427.8 nm. The Chatanika radar measured electron densities of 10 to the 6th per cu cm and electron temperatures of 6000 K at an altitude of 400 km and an invariant latitude of 59 deg in association with the aurora. Comparison of optical and radar measurements indicated that the 630.0-nm emissions were produced to a large degree by thermal excitation of O(1D) in the region of high electron temperatures and densities. Model calculations indicate that the observed density and temperature enhancements and the related optical emissions were the results of a relatively short duration (5-10 min) pulse of precipitating, low-energy (about 30 eV) electrons. Whereas conventional stable auroral red arcs are associated with a gradual decrease in ring current energy density during the recovery phase of a magnetic storm, the type A red aurora may be produced by impulsive ring current energy loss during the main phase.
Kozyra Janet U.
Mende Stephen B.
Nagy Andrew F.
Robinson Richard M.
Vondrak Richard R.
No associations
LandOfFree
Radar and photometric measurements of an intense type A red aurora does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Radar and photometric measurements of an intense type A red aurora, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radar and photometric measurements of an intense type A red aurora will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-926953