Abstract
SOLAR, X-ray emission becomes increasingly localized to active regions as the photon energy increases. Photographs of the Sun at X-ray energies less than 0.5 keV show emission from the entire corona, while those sensitive in the 1–3 keV interval show the X-ray emission to be concentrated in condensed regions1,2 which are correlated with features apparent at both optical and radio wavelengths. If this trend were to continue as expected, X-rays at energies above 3 keV would be emitted exclusively from active regions with little or no contribution from the general corona.
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References
Underwood, J. H., and Muney, W. S., Solar Phys., 1, 129 (1967).
Pounds, K. A., and Russell, P. C., Space Res., 6, 38 (1966).
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CATURA, R., ACTON, L. & FISHER, P. Localization of Solar X-ray Emission at Energies above 3 keV. Nature 227, 55–56 (1970). https://doi.org/10.1038/227055a0
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DOI: https://doi.org/10.1038/227055a0
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