Effects of Impulsive Heating Events on F-Region Chemistry and Electron Density. HAES Report Number 81.
Topical rept. Mar 78-Jul 79,
SRI INTERNATIONAL MENLO PARK CA
Pagination or Media Count:
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.
- Atmospheric Physics
- Plasma Physics and Magnetohydrodynamics