Title: Arctic measurements of electron collision frequencies in the D-region of the ionosphere
Abstract: Electron collision frequencies in the D-region were measured with the aid of rockets launched during polar blackouts at Fort Churchill, Canada (58°N.). During the blackouts the ionization content of the D-region was large enough to cause a strong altitude-dependent absorption of a 7.75 Mc/s CW signal, radiated from the rocket. The refractive indices and the difference absorption of the two magneto-ionic components of this signal were simultaneously measured versus altitude. The electron collision frequency profile was then determined from these measurements. The results from two midday rocket flights, one made in July, 1957 and the other in November, 1956, indicate that the electron collision frequencies in the Arctic D-region are lower by a factor of three than the standard values calculated by Nicolet [1957]. At 70 km the measured value of the collision frequency is (1.0±0.3)×107 sec−1.
Publication Year: 1959
Publication Date: 1959-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 42
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