Abstract
An analysis has been made of type III bursts recorded during a decametric solar storm observed from July 29 to August 16, 1975 with the UTR-2 antenna (Kharkov, IRE Acad. Sci. Ukr. SSR). The bursts were recorded with a dynamic spectrograph and radiometers at 25.0, 20.0, 16.7, and 12.5 MHz. Daily observations have yielded histograms of the type III burst distribution with respect to the frequency drift rate in three subbands between 25.0 and 12.5 MHz. During the middle stage of the storm the drift rate was about twice as high as at the onset and the final stage of the storm. Abrupt changes in the mean frequency drift rate were registered some two to three days after the active region McMath 13790 had come onto the limb and also before it disappeared behind the solar disk. Sudden changes in the drift rates of the type III bursts were accompanied by sudden changes of their mean duration. The rather long burst durations observed at 25.0 MHz at the beginning and the end of the radio storm coincided with such at the twice lower frequency, i.e. 12.5 MHz, during the period when an increased drift rate was observed.
Similar variations of type III burst parameters can be interpreted in the framework of the plasma mechanism of burst generation in the corona, assuming that at the middle stage of the storm the bursts observed in the 25.0–12.5 MHz range were emitted at the fundamental whereas when the emitting region was near the limb the bursts received corresponded to the second harmonic of the Langmuir oscillations in the range of 12.5 to 6.25 MHz excited at greater heights.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Abranin, E. P., Bazelyan, L. L., Goncharov, N. Yu., Zinichev, V. A., Rapoport, V. O., and Tsybko, Ya. G.: 1979, Solar Phys. 62, 145.
Bazelyan, L. L., Goncharov, N. Yu., Zaitsev, V. V., Zinichev, V. A., Rapoport, V. O., and Tsybko, Ya. G.: 1974, Solar Phys. 39, 223.
Caroubalos, C, Poquerusse, M, and Steinberg, J. L.: 1974, Astron. Astrophys. 32, 255.
Duncan, R. A.: 1979, Solar Phys. 63, 389.
De la Noë, J., Aubier, M. G., and Youssef, S. M.: 1978, Astron. Astrophys. 67, 333.
Fainberg, J. and Stone, R. G.: 1970, Solar Phys. 15, 433.
Fainberg, J. and Stone, R. G.: 1974, Space Sci. Rev. 16, 145.
Fomíchev, V. V. and Chertok, I. M.: 1970, Astron. Zh. 47, 226.
Gergely, T. E. and Kundu, M. R.: 1975, Solar Phys. 41, 163.
Kundu, M. R., Erickson, W. C., and Jackson, D. D.: 1970, Solar Phys. 14, 394.
Leblanc, Y.: 1973, Astrophys. Letters 14, 41.
Mallinge, A. M.: 1963, Ann. Astrophys. 26, 97.
Malville, J. M.: 1962, Astrophys. J. 136, 266.
Riddle, A. C.: 1974, Solar Phys. 35, 153.
Solar-Geophysical Data: 1975, No. 373, Part I.
Solar Data: 1975, Nos. 7, 8, Leningrad, U.S.S.R.
Stewart, R. T.: 1965, Australian J. Phys. 18, 67.
Stewart, R. T.: 1972, Proc. Astron. Soc. Australia 2, 100.
Stewart, R. T.: 1975, Solar Phys. 40, 417.
Stewart, R. T.: 1977, Izv. VUZov, Radiofizika 20, 1338.
Susuki, S. and Sheridan, K. V.: 1977, Izv. VUZov, Radiofizika 20, 1432.
Wild, J. P., Sheridan, K. V., and Neylan, A. A.: 1959, Australian J. Phys. 12, 369.
Zaitsev, V. V., Mityakov, N. A., and Rapoport, V. O.: 1972, Solar Phys. 24, 444.
Zheleznyakov, V. V. and Zaitsev, V. V.: 1970, Astron. Zh. 47, 308.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Abranin, E.P., Bazelyan, L.L., Rapoport, V.O. et al. Variations of type III burst parameters during a decametric solar storm. Sol Phys 66, 333–346 (1980). https://doi.org/10.1007/BF00150589
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00150589