Abstract
Two-dimensional maps of circularly polarized emission from the Sun at 7.8 GHz, with a resolution of 4.4 arc minutes, show polarization of local sources of up to 15% and variations as small as 2% in flux density and 0.2% in polarization, as functions of time. Both flux density and polarization in McMath plage 11002 showed substantial increases thirty minutes or more before a flare on October 24, 1970. It is suggested that flares may be triggered when both of these quantities surpass critical values.
This is a preview of subscription content, access via your institution
Access options
Similar content being viewed by others
References
Kaufmann, P., Matsuura, O. L., and Marques dos Santos, P., Solar Physics, 14, 190 (1970).
Kaidanovskii, N. L., Korolkov, D. V., Soboleva, N. S., and Kharkin, S. E., Doklady Akad. Nauk SSR, 112, 1012 (1957).
Tanaka, H., and Kakimuma, L., Rept. Ionosph. Space Res. Japan, 12, 273 (1958).
Gelfriekh, G. B., Korolkov, D., Rishkov, N., and Soboleva, N., Paris Symposium on Radio Astronomy (edit. by Bracewell, R. N.) (Stanford Univ. Press, 1959).
Tanaka, H., and Steinberg, J. L., Ann d'Astrophys., 27, 29 (1964).
Kundu, M. R., Ann d'Astrophys., 22, 1 (1959).
Tanaka, H., and Enome, S., Nature, 225, 435 (1970).
Gelfreikh, G. B., and Peterova, N. G., Sov. Astron. AJ, 14, 553 (1971).
Edelson, S., Mayfield, E. B., and Shimabukuro, F. I., Nature Physical Science, 232, 82 (1971).
Carrigan, A. L., Geophysics and Space Data Bulletin, 7, 209 (1970).
Solar Geophysical Data, 316, part 1, 79 (US Dept. Commerce, Boulder, Colorado 80302, December 1970).
Kaufmann, P., Matsuura, O. L., and Marques dos Santos, P., Astrophys. J., 156, 43 (1969).
Zlotnik, E. Ya., Sov. Astron. AJ, 12, 464 (1968).
Gelfreikh, G. B., Derevyonko, O. G., Korzhavin, A. N., and Stasyuk, N. P., Solnechnyye Dannyye Bulletin, No. 9, 88 (1969).
Durasova, M. S., Dobrin, M. M., and Yudin, O. I., Nature Physical Science, 229, 82 (1971).
Simon, M., and Shimabukuro, F. I., Bulletin AAS, 3, 264 (1970).
Grebinskii, A. S., Manko, V. I., and Yasnov, L. V., Sov. Astron. AJ, 12, 473 (1968).
Gold, T., Stellar and Solar Magnetic Fields (edit. by Lust, R.), 390 (North Holland, Amsterdam, 1965).
Kundu, M. R., Solar Radio Astronomy, chapter 6 (Interscience, New York, 1965).
Kakinuma, L., and Swarup, G., Astrophys. J., 136, 975 (1962).
de Jager, C., Solar Flares and Space Research (North Holland, Amsterdam, 1969).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
RICHARDS, D., STRAKA, R. Mapping of Solar Polarization at 7.8 GHz. Nature Physical Science 233, 92–94 (1971). https://doi.org/10.1038/physci233092a0
Received:
Issue date:
DOI: https://doi.org/10.1038/physci233092a0
This article is cited by
-
Study of a filament with a circularly polarized beam at 3.8 cm
Solar Physics (1975)
-
The July 1974 solar events: A possible lower limit for microwave activity
Solar Physics (1975)
