Abstract
Data from a combined ion line/plasma line incoherent scatter experiment with the European Incoherent Scatter (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 5×14 µs 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 (MSIS) 1983 neutral atmosphere model.
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