Role of chemical effects in the formation of electron concentration depletions during HF heating of the ionosphere

Details Role of chemical effects in the formation of electron concentration depletions during HF heating of the ionosphere Role of chemical effects in the formation of electron concentration depletions during HF heating of the ionosphere

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..119m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 52, Feb. 1990, p. 119-123.

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Atmospheric Chemistry, Electron-Ion Recombination, High Frequencies, Ionospheric Electron Density, Ionospheric Heating, Ionospheric Sounding, Atomic Excitations, Ionospheric Propagation, Nitrogen Ions, Radio Waves, Upper Ionosphere

Scientific paper

A chemical mechanism which reduces the electron concentration in the upper ionosphere during HF heating is presented. It is based on the excitation of nitrogen vibrational levels by fast electrons which have appeared as a result of absorption of a radio wave. The vibrational excitation of nitrogen leads to an increase in ion-molecular exchange, followed by a depletion of the electron concentration because the positive molecular ions are very effectice in electron-ion recombination. Two different models are discussed. In the equilibrium model, the vibrational temperature has been established in the region disturbed by the radio wave. In the nonequilibrium model, the fast electrons are moving inside a thin duct where the time of vibrational-vibrational relaxation is greater than the time required by the excited molecules to leave the channel due to diffusion, so that the vibrational temperature cannot be established.

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