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Title: Ion-neutral Collision Frequency Variations in the Lower Thermosphere from Incoherent Scatter Measurements
Authors: Mahajan, K K
Jain, V C
Kohli, R
Issue Date: Dec-1982
Publisher: NISCAIR-CSIR, India
Abstract: Incoherent scatter measurements of ion-neutral collision frequency (vin) in the lower thermosphere at Arecibo (18.4ᵒN, 67ᵒW) are analyzed for the period Aug. 1974 to May 1977. Results indicate a gradual increase of vin from morning to evening in summer by about a factor of two. This behavior reverses in winter when the value decreases from morning to evening. The ion-neutral collision frequency also shows large variability from one observation to next. These results are discussed in relation to static diffusion models which assume constant boundary conditions at the turbopause.
Page(s): 225-228
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.11(6) [December 1982]

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