Abstract
Observations of solar radio emission at 3 cm wavelength have been made at Japal-Rangapur Observatory for 1980–1981, the solar maximum year using the 3 m radio telescope. The correlation between microwave solar emissions and the sunspot activity on monthly basis has been found to be high during the maximum phase and in the high cm wavelength band. The basic component has been estimated statistically for successive solar rotations using the data obtained at Japal-Rangapur Observatory. Further, this was compared with the data obtained at other cm wavelengths during 1980–1981 and the solar minimum period 1975–1976 of the 21st cycle. The comparison showed pronounced dips in flux levels at different wavelengths during the summer months of the solar maximum year which may be attributed to the presence of coronal holes in the various levels of the solar atmosphere. The computed basic component values showed pronounced variation at high cm wavelengths for the solar maximum period with dissimilar variations at different wavelengths. During the solar minimum period the variations were negligibly small and showed more or less constant level of activity.
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References
Bohlin, J. D.: 1977,Solar Phys. 51, 377
Christiansen, W. N. and Hindmann, J. V.: 1951,Nature 167, 635.
Covington, A. E.: 1977,Solar Phys. 54, 393.
Das Gupta, M. K. and Basu, D.: 1965,Nature 208, 739.
Kruger, J. L. and Olmr, T.: 1973,Bull. Inst. Czech. 24, 202.
Kundu, M. R. and Velusamy, T.: 1974,Solar Phys. 34, 125.
Pawsey, J. L. and Yabsley, D. E.: 1949,Australian J. Sci. Res. A2, 198.
Van de Hulst, H. C.: 1949,Nature 163, 24.
Xanthakis, J.: 1969,Solar Phys. 10, 168.
Zieba, S. and Gula, R.: 1976,Acta Astron. 26, No. 1, 53.
Zirin, H., Hurford, G. J., and Marsh, K. A.: 1978,Astrophys. J. 224, 1043.
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Lokanadham, B., Subramanian, P.K. Variations in quiet sun radiation at centimetre wavelengths during solar maximum period. Astrophys Space Sci 119, 27–32 (1986). https://doi.org/10.1007/BF00648806
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DOI: https://doi.org/10.1007/BF00648806