Abstract
IT is now well known that radiation in the 1-metre wave-length range from the quiescent sun corresponds, to that from a black body at about 106 °K., but that when large spot groups are present the effective temperature is many times higher, the extra radiation, originating in the neighbourhood of the spot group. The million degree radiation has been explained by Martyn1, who attributes this to thermal emission from the normal corona. Kiepenheuer has suggested2 that the enhanced emission comes from thermal! electrons spiralling around lines of magnetic force. This idea has been attacked by Martyn3, and both he and Shklovsky4 have advanced theories for the enhanced emission involving radiation by electrons oscillating at the fundamental frequency of the plasma.
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References
Martyn, D. F., Nature, 158, 632 (1946).
Kiepenheuer, K. O., Nature, 157, 47 (1946).
Martyn, D. F., Nature, 159, 26 (1947).
Shklovsky, J. S., Nature, 159, 752 (1947).
Giovanelli, R. G., "Electromagnetic Fields and Currents in the Sun‘s Atmosphere near Growing Sunspots", Mon. Not. Roy. Ast. Soc. (in the press).
Giovanelli, R. G., "Chromospheric Flares and Their Origin", Mon. Not. Roy. Ast. Soc. (in the press).
Giovanelli, R. G., "Electron Energies Resulting from an Electric Field in a Highly Ionised Gas", Phil. Mag. (in the press).
Bailey, V. A., (private communication).
Pawsey, J. L., Payne-Scott, R., and McCready, L. L., Proc. Roy. Soc. (in the press).
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GIOVANELLI, R. Emission of Enhanced Microwave Solar Radiation. Nature 161, 133–134 (1948). https://doi.org/10.1038/161133b0
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DOI: https://doi.org/10.1038/161133b0
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