Accession Number:

ADA083333

Title:

Effects of Impulsive Heating Events on F-Region Chemistry and Electron Density. HAES Report Number 81.

Descriptive Note:

Topical rept. Mar 78-Jul 79,

Corporate Author:

SRI INTERNATIONAL MENLO PARK CA

Personal Author(s):

Report Date:

1979-07-31

Pagination or Media Count:

41.0

Abstract:

The Chatanika incoherent-scatter radar located near Fairbanks, Alaska, L 5.6 has been used to study the ionospheric effects of impulsive auroral heating events. In some cases, the time-integrated auroral energy deposition is similar in magnitude to that expected from a high altitude nuclear event outside the fireball region. The resulting ionospheric effects are significant. The elevated temperatures and atmospheric heave contribute to a substantial change in F-region ion chemistry, changing the dominant F-region ion from atomic to molecular species. As a result, a significant depletion of the F-region electron density occurs. Currently, these effects are not accurately predicted by the nuclear codes, as the function of the codes is to predict the large-scale perturbations. The Chatanika radar data can be used to improve the ambient ionospheric models and to improve the predictions of F-region changes resulting from sudden heating events.

Subject Categories:

  • Atmospheric Physics
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE