The role of vibrationally excited nitrogen in the formation of the mid-latitude ionisation trough

Details The role of vibrationally excited nitrogen in the formation of the mid-latitude ionisation trough The role of vibrationally excited nitrogen in the formation of the mid-latitude ionisation trough

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..479p&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 6, p. 479-484.

Physics

12

Atmospheric Ionization, F Region, Midlatitude Atmosphere, Nitrogen Ions, Vibrational Spectra, Plasma Diffusion, Thermosphere

Scientific paper

Results are presented of a study of the effect of the equatorward transport of N2* by thermospheric wind on the formation of the trough. The first calculations of the vibrational temperature, Tv, in the trough are obtained from solutions of the vibrational quanta equation in which the production, diffusion, action of thermospheric wind, and loss of N2* are taken into account. The main sources of N2* in the trough and on the poleward edge of the trough are considered. It is shown that a marked difference between Tv and the neutral temperature, Tn, is obtained by the thermal electron excitation of N2 or by the reaction of O(D-1) with N2. The sources of N2* vibrational excitation arising from the reaction of N with NO and by low-energy auroral electron excitation of N2 are negligible. If the production frequency of vibrational quanta for the trough, W(z, x), (where z is the altitude and x is the axis in the horizontal direction with geomagnetic north on geomagnetic south) is approximately the same as the production frequency, W(z, 0) for the poleward edge of the trough, then the effect of equatorward transport of N2* on the formation of the trough is negligible.

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