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On the regions over sunspots as studied by polarization observations on centimeter wavelengths

Published online by Cambridge University Press:  14 August 2015

G. Gelfreich ,
D. Korol'Kov ,
N. Rishkov  and
N. Soboleva
G. Gelfreich
Affiliation:
Pulkovo Observatory, Leningrad, U.S.S.R.
D. Korol'Kov
Affiliation:
Pulkovo Observatory, Leningrad, U.S.S.R.
N. Rishkov
Affiliation:
Pulkovo Observatory, Leningrad, U.S.S.R.
N. Soboleva
Affiliation:
Pulkovo Observatory, Leningrad, U.S.S.R.

Extract

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The observations of the sun at centimeter wavelengths made at Pulkovo in 1956–58 have shown: (1) There are regions of appreciable size over the majority of sunspots that have “enhanced” radio emission at centimeter wavelengths [1]. The nature of this emission shows that it belongs to the slowly varying component. In fact, as long as a group of sunspots persists, the flux of such an active region preserves its almost constant value. (2) The emission is partly circular, the polarized flux changing in magnitude but inappreciably. The sign of polarization rotation remains constant [2], which appears to be positive proof that a rather intense and stable magnetic field exists in these regions. (3) The extent of the regions is about that of the spot nuclei [3]. (4) Their brightness temperature amounts to several million degrees. (5) The height at which enhanced radio emission is produced is of the order 1.07 ± 0.02R⊙ [4].

Type
Part II: The Sun
Information
Symposium - International Astronomical Union , Volume 9: Paris Symposium on Radio Astronomy , 1959 , pp. 125 - 128
Copyright
Copyright © Stanford University Press 1959 

References

1. Ikhsanova, V. N. Izv. Obs. Pulkovo , 162, 1958 (in press).Google Scholar
2. Kaĭdanovskiĭ, N. L., Korol'kov, D. V., Soboleva, N. S., and Khaikin, S. E. Dokl. Akad. Nauk S. S. S. R. 112, 1012, 1957.Google Scholar
3. Korol'kov, D. V., and Soboleva, N. S. Solar Data, Moscow , 1, 1957.Google Scholar
4. Ikhsanova, V. N. Solar Data, Moscow , 6, 1957.Google Scholar
5. Severnyĭ, A., and Bumba, V. The Observatory , 78, 902, 1958.Google Scholar
6. Al'pert, Ia. L., Ginzburg, V. L., and Faĭnberg, E. L. Propagation of Radiowaves. Moscow, 1953.Google Scholar