Effective electron collision frequency measurements in the E- and F-regions |
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| Affiliation: | 1. Space Research Institute, 40 Acad. Glushkov Ave., Kyiv 03187, Ukraine;2. Plasma Dynamics Group, School of Mathematics and Statistics, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, UK;3. Plasma Dynamics Group, Department of Automatic Control and Systems Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK;1. Institute of Ionosphere, 16 Kyrpychova Str., Kharkiv 61002, Ukraine;2. Institute of Atmospheric Physics of the Czech Academy of Science, Boční II 1401/1A, Prague 14100, Czech Republic;3. State Institution National Antarctic Scientific Center of the Ministry of Education and Science of Ukraine, 16 Taras Shevchenko Blvd., Kyiv 01601, Ukraine;4. Institute of Radio Astronomy of the National Academy of Sciences of Ukraine, 4 Mystetstv Str., Kharkiv 61002, Ukraine;5. University of New Brunswick, 3 Bailey Dr, Fredericton, NB E3B 5A3, Canada |
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| Abstract: | The collision frequency v in the ionosphere has often been determined by measuring differences in the amplitude and group path of two closely spaced signals reflected in the region of high group retardation. In this paper we describe a method of measuring v using a CW double-side-band modulated signal reflected obliquely in the ionosphere. This allows v to be determined on a continuous basis and it is found that the value of v obtained is 1–5 × 104 s−1 for the E-region and ~ 103 s−1 for the F-region. It is shown that measurements made just after sunset, when the E-region is still present, are more representative of E-region values than F-region. |
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