Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa42a..03m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA42A-03
Other
2403 Active Experiments, 2419 Ion Chemistry And Composition (0335), 2435 Ionospheric Disturbances
Scientific paper
The electron and ion-molecule kinetics effects are usually disregarded in modeling non-equilibrium ionospheric plasma subjected to strong heating. This presentation aims to describe these effects during HF modification experiments. First, as long as electron heating is collisional, the population of thermal electrons at >2 eV is reduced due to excitation of mainly nitrogen vibrational states. As a result, the electron cooling rate, a key parameter in the thermal energy balance, decreases relative to that in Maxwellian plasma. Other outcomes are the decrease of the rates of excitation of the red-line emission and Landau damping. The latter leaves the background suprathermal electron population (photoelectrons in the F region and secondary electrons in precipitation-produced E layers) as the main candidate for acceleration by HF-excited plasma turbulence. In the course of heating, nitrogen and molecular oxygen vibrational states are excited by the energized electron population. This leads to significant changes in the rate coefficients and quantum chemical yields of the basic ion-molecule reactions depending on vibrational temperatures. As a result, while the density of the hot plasma is slowly depleted, the green-to-red ratio and intensity of HF-induced airglow increases. The latter is consistent with the observations of the gradual evolution of the airglow during injections HF O-mode waves at the magnetic zenith.
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