Surname: Vincent
First Name: Robert A.
Status= other
Institution: University of Adelaide
E-mail: robert.vincent@adelaide.edu.au
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Title: 
Lower ionospheric collision frequencies: A comparison of radar measurements and 
laboratory data
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Authors: 
R. A. Vincent, R. Vuthaluru, D. A. Holdsworth
I. M. Reid, W. G. Elford and M. T. Elford
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Abstract: 
Electron densities and collision frequencies in the 60-100 km height range are 
measured using differential absorption techniques with the 1-km Buckland Park 
array located near Adelaide, Australia. The observed collision frequencies show 
significant differences from values calculated using laboratory-measured 
molecular cross-sections and observed atmospheric pressures. The discrepancy is 
resolved if new laboratory measurements of N2, O2, and O collision 
cross-sections for momentum transfer are incorporated. The effect is to 
significantly increase collision frequencies over previously used values, with 
implications for calculations of ionospheric current strengths.
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Discipline Category: Ionosphere
Discipline Category: Mesosphere