Physics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.3799b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, April 1, 1989, p. 3799-3804.
Physics
6
Collision Rates, E Region, Incoherent Scattering, Ionospheric Ion Density, Neutral Atmospheres, Space Plasmas, Atmospheric Models, Electric Current, Ion Temperature
Scientific paper
Data from a combined ion line/plasma line incoherent scatter experiment with the EISCAT/UHF radar are used to derive the ion-neutral collision frequency in the lower E region (101-114 km). The ion line measurement is based on a 5 x 14 microsec multipulse scheme giving a range resolution of 3 km. A spectrum analyzer is used to measure plasma line signals from the same altitudes. A 1-hour period at local noon where stable photoelectron enhanced plasma lines were detected is chosen for the analysis. The temperature/collision frequency ambiguity in the ion-line autocorrelation function is resolved by incorporating the observed plasma line offset in the least-squares fitting procedure. No assumption on the electron-to-ion temperature ratio is needed. The fitted collision frequencies compare well with a profile based on the mass spectrometer/incoherent scatter 1983 neutral atmosphere model.
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