Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000angeo..18.1422m&link_type=abstract
Annales Geophysicae, vol. 18, Issue 11, pp.1422-1434
Physics
9
Ionosphere (Ionosphere-Atmosphere Interactions, Mid-, Atitude Ionosphere, Plasma Temperature And Density)
Scientific paper
The mechanism of the NmF2 peak formation at different levels of solar activity is analyzed using Millstone Hill IS radar observations. The hmF2 nighttime increase due to thermospheric winds and the downward plasmaspheric fluxes are the key processes responsible for the NmF2 peak formation. The electron temperature follows with the opposite sign the electron density variations in this process. This mechanism provides a consistency with the Millstone Hill observations on the set of main parameters. The observed decrease of the nighttime NmF2 peak amplitude with solar activity is due to faster increasing of the recombination efficiency compared to the plasmaspheric flux increase. The E×B plasma drifts are shown to be inefficient for the NmF2 nighttime peak formation at high solar activity.
Forster Manuel
Leschinskaya Yu. T.
Mikhailov Alexander. V.
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