Abstract
Active regions on the Sun in the 20th solar cycle are studied with special reference to their association with proton flares based on microwave interferometric observations at Toyokawa Observatory. It has been reconfirmed that the active regions associated with intense S-component emission with a high 3-cm to 8-cm flux ratio are likely to produce proton flares.
About one fourth of 259 active regions during the period investigated are found to have definite features in the spatial distribution of polarization at a wavelength of 3 cm. Active regions with one particular type of polarization pattern have a good correlation with the occurrence of proton flares.
Similar content being viewed by others
References
Alfvén, H. and Carlqvist, P.: 1967, Solar Phys. 1, 220.
Bruzek, A.: 1972, in C. de Jager (ed.), Solar-Terrestrial Physics/1910, Part I, 49.
Datlowe, D.: 1971, Solar Phys. 17, 436.
Gopasyuk, S., Ogir, M., Severny, A. B., and Shposhnikova, E.: 1963, Izv. Krymsk. Astrofiz. Obs. 29, 15.
Kakinuma, T. and Swarup, G.: 1962, Astrophys. J. 136, 975.
Kundu, M. R.: 1959, Ann. Astrophys. 22, 1.
Lin, R. P., Kahler, S. W., and Roelof, E. C: 1968, Solar Phys. 4, 338.
McCracken, K. G. and Rao, U. R.: 1970, Space Sci. Rev. 11, 155.
Michard, R. and Ribes, E.: 1968, in K. O. Kiepenheuer (ed.), ‘Structure and Development of Solar Active Regions’, IAU Symp. 35, 420.
Obayashi, T.: 1966, Rep. Ionosph. Space Res. Japan 20, 3.
Petschek, H. E.: 1964, Proc. AAS-NASA Symp. Physics of Solar Flares, NASA SP-50, 415.
Pick, M.: 1961, Ann. Astrophys. 24, 183.
Pick, M. and Simon, P.: 1973, Proc. IEEE 61, 1303.
Severny, A. B. and Steshenko, N. V.: 1972, in C. de Jager (ed.), Solar Terrestrial Physics/1970, Part I, 173.
Simnett, G. M.: 1972, Solar Phys. 22, 189.
Smith, S. F. and Howard, R.: 1968, in K. O. Kiepenheuer (ed.), Structure and Development of Solar Active Regions’, IAU Symp. 35, 33.
Sweet, P. A.: 1956, in B. Lehnert (ed.), ‘Electromagnetic Phenomena in Cosmical Physics’, IAU Symp. 6, 123.
Syrovatskii, S. I.: 1966, Soviet Astron. - AJ 10, 270.
Tanaka, H. and Kakinuma, T.: 1964, Rep. Ionosph. Space Res. Japan 18, 32.
Zheleznyakov, V. V.: 1962, Soviet Astron. - AJ 6, 3.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Tanaka, H., Énomé, S. The microwave structure of coronal condensations and its relation to proton flares. Sol Phys 40, 123–131 (1975). https://doi.org/10.1007/BF00183156
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00183156