Collision frequencies in the D-region |
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| Authors: | R Vuthaluru R A Vincent D A Holdsworth I M Reid |
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| Abstract: | Partial reflection differential absorption and differential phase observations have been used to systematically study collision frequencies (ν) in D-region of the lower ionosphere. The observations made with the large MF radar located at Buckland Park (35°S, 138°E) near Adelaide in the period September 1996–December 2000 show ν values larger than predicted by previously used models. The new estimates are compared with values calculated using new collision frequency momentum cross-sections for N2(σ) measured in the laboratory. The two types of measurements are found to be in good agreement, with a moderate seasonal variation of ν at a constant height. No change due to solar cycle variations is found. |
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| Keywords: | D-region Collision frequencies Collision Cross-sections Differential absorption Differential phase |
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