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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
|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.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.11(6) [December 1982]|
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