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Telecommunications and Radio Engineering
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ISSN Print: 0040-2508
ISSN Online: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v59.i3-4.110
21 pages

Middle Latitude Ionospheric D-Region Responses to Solar Events as Investigated by Partial Reflection Technique

A. M. Gokov
S. Kuznets Kharkiv National University of Economics, Ministry of Education and Science of Ukraine, 9a, Nauka Ave., Kharkiv 61166, Ukraine; V. Karazin Kharkiv National University, 4, Svobody Sq., Kharkiv 61022, Ukraine
O. F. Tyrnov
V. Karazin Kharkiv National University, 4, Svobody Sq., Kharkiv 61022, Ukraine


Using a partial reflection technique, there were experimentally investigated the middle latitude ionospheric D-region responses to X-ray radio-frequency radiation (XRA), optical flares (FLA) on the Sun, to geomagnetic sudden storm commencements (ssc) for an appearing shock solar front at the time of solar flares, and to events of solar protons (spe) precipitating into the Earth ionosphere. In characteristic time intervals after the phenomena mentioned above, characteristic changes in parameters of the partial reflection signals, radio noise and electron density were found to occur with characteristic durations of about tens of minutes. There is given a possible physical interpretation of the middle latitude D-region responses for each type of the phenomena: on the basis of the experimental data on the electron density changes, the estimations of change rate of the D-region ionization were made, and calculations of the precipitating electron and proton flow parameters were carried out.

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