Abstract
The large values of the heights, their dependence on latitude and time as found by Graf and Bracewell can satisfactorily be explained by assuming a constant height of around 18000 km and by taking into account that the microwave sources do not lay above the spots but above the plages.
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References
Graf, W. and Bracewell, R. N.: 1972, Solar Phys. 28, 425.
Graf, W. and Bracewell, R. N.: 1973, Solar Phys. 33, 75.
Waldmeier, M.: 1969–1972, Astron. Mitt. Eidgen. Sternwarte Zürich, No. 288, 296, 303, 311.
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Waldmeier, M. The height of the 9 cm solar emission. Sol Phys 57, 369–371 (1978). https://doi.org/10.1007/BF00160109
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DOI: https://doi.org/10.1007/BF00160109