Strong temperature control of the ionospheric D-region - Evidence from in situ ion composition measurements

Details Strong temperature control of the ionospheric D-region - Evidence from in situ ion composition measurements Strong temperature control of the ionospheric D-region - Evidence from in situ ion composition measurements

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..249a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 42, Mar. 1980, p. 249-256.

Physics

1

Atmospheric Ionization, D Region, Ionospheric Ion Density, Ionospheric Temperature, Temperature Control, Gas Density, Positive Ions, Thermal Dissociation

Scientific paper

Determination of time constants tau for the conversion of NO(+) ions to cluster ions from 8 in situ measurements of the composition of positive and negative ions and of neutral gases is presented. A strong increase of tau with temperature is revealed which becomes most pronounced above 175 K due to thermal dissociation of the weakly bonded cluster ions NO(+)N2 and NO(+)CO2. A strong temperature control of the fractional abundance of cluster-ions and of the bulk recombination coefficient should be expected; it is proposed that the winter anomalous enhancement of radio wave absorption in the D-region is at least in part caused by a decrease in the bulk recombination coefficient associated with enhanced temperatures.

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