The response of the ionospheric D region to X-ray and optical flares as observed by partial reflection technique at mid-latitudes
Heading:
| 1Gokov, AM, 2Tyrnov, OF, 1Chernogor, LF 1V.N. Karazin National University of Kharkiv, Kharkiv, Ukraine 2V.N. Karazin Kharkiv National University, Kharkiv, Ukraine |
| Kosm. nauka tehnol. 2005, 11 ;(3-4):056-067 |
| https://doi.org/10.15407/knit2005.03.056 |
| Publication Language: Russian |
Abstract: A possible response of the middle latitude ionospheric D region to X-ray and optical flares is studied by ihe partial reflection technique The parameters of partial reflection signals, radio noise, and electron density are found to display characteristic features that appear in 15–25 min after X-ray bursts and last for about 15–30 min. We give a possible, physical interpretation of the results of the observations with taking into account X-ray emission rates.
|
References:
1. Garmash K. P., Chernogor L. F. Profiles of the ionospheric D-region electron density under quiet and disturbed conditions from data on partial reflections. Geomagnetizm i Aeronomiia, 36 (2), 75—81 (1996) [in Russian].
2. Gokov A. M., Chernogor L. F. Processes in Lower Ionosphere during August 11, 1999 Solar Eclipse. Radio Physics and Radio Astronomy, 5 (4), 348—360 (2000) [in Russian].
3. Knuth R., Wuerzberger I. Midlatitude ionospheric perturbations caused by high-energy particles. Geomagnetizm i Aeronomiia, 16 (4), 666—673 (1976) [in Russian].
4. Knuth R., Fedorova N. I. Coordinated international measurements of geophysical effects of solar activity in the upper atmosphere. IV - Energetic particle precipitation during a baylike disturbance of the midlatitude ionospheric D region. Geomagnetizm i Aeronomiia, 17 (5), 854—861 (1977) [in Russian].
5. Lastovicka J., Fedorova N. I. Coordinated international measurements of the geophysical effects of solar activity in the upper atmosphere. III - Unusual mid-latitude ionospheric disturbance of corpuscular origin. Geomagnetizm i Aeronomiia, 16 (6), 1018—1025 (1976) [in Russian].
6. Lyatsky V. B., Maltsev Yu. P. Magnetosphere-Ionosphere Coupling, 192 p. (Moscow, Nauka, 1983) [in Russian].
7. Mitra A. P. Ionospheric Effects of Solar Flares, 370 p. (Mir, Moscow, 1977) [in Russian].
8. Hargreaves J. K. The upper atmosphere and solar-terrestrial relations - An introduction to the aerospace environment, Transl. from Eng., Ed. by A. D. Danilov, 351 p. (Gidrometeoizdat, Leningrad, 1982) [in Russian].
9. Chernogor L. F. Disturbance of the inhomogeneous structure in the lower ionosphere as a result of powerful radio emission. Izv. vuzov. Radiofizika, 28 (12), 17— 26 (1985) [in Russian].
10. Chernogor L. F., Garmash K. P., Rozumenko V. T. Flux parameters of energetic particles affecting the middle latitude lower ionosphere. Radio Physics and Radio Astronomy, 3 (2), 191—197 (1998).
11. Feldman W. C., Symbalisty E. M. D., Roussel-Dupre R. A. Hard X ray survey of energetic electrons from low-Earth orbit. J. Geophys. Res., 101, 5195—5209 (1996).
https://doi.org/10.1029/95JA03393
https://doi.org/10.1029/95JA03393
12. Gokov A. M., Tyrnov O. F. The lower ionosphere response to some phenomena related to events on the Sun. In: Proc. of the Intern. Symp. from solar corona through interplanetary space, into Earth’s magnetosphere and ionosphere: Interball ISTP satellites, and ground-based observations. Session I—IV. February 1—4, 2000, Kyiv, 141—144 (Kyiv, 2000).
13. Gurevich A. V. Nonlinear phenomena in the ionosphere, 366 p. (Springer-Verlag, New York, 1978).
https://doi.org/10.1007/978-3-642-87649-3
https://doi.org/10.1007/978-3-642-87649-3
14. Hargreaves J. K. The Solar-Terrestrial Environment, 420 p. (Cambridge Univ. Press, New York, 1992).
https://doi.org/10.1017/CBO9780511628924
https://doi.org/10.1017/CBO9780511628924
15. Tyrnov O. F., Garmash K. P., Gokov A. M., et al. The radiophysical observatory for remote sounding of the ionosphere. Turk. J. Phys., 18, 1260—1265 (1994).
16. McRae W. M., Thomson N. R. Solar flare induced ionospheric D-region enchancements from VLF phase and amplitude observations. J. Atmos. and Solar-Terr. Phys., 66 (1), 77—87 (2004).
https://doi.org/10.1016/j.jastp.2003.09.009