The relation between the intensities of umbra and penumbra of large sunspots

Details The relation between the intensities of umbra and penumbra of large sunspots The relation between the intensities of umbra and penumbra of large sunspots

Sep 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974soph...38...73e&link_type=abstract

Solar Physics, vol. 38, Sept. 1974, p. 73-75.

Physics

6

Luminous Intensity, Penumbras, Solar Atmosphere, Sunspots, Umbras, Absorption Spectra, Infrared Spectra, Line Spectra, Photometry, Solar Spectra

Scientific paper

Based on pinhole photometer observations in 4-6 wavelength regions we have searched for a connection between the intensities of the umbra and the penumbra of sunspots. For the 1.67 microns wavelength region it is apparent that spots with dark umbrae also have dark penumbrae. In the other wavelength regions similar relations are found. The darkness of the spot is probably connected with the degree of complexity of the spot.

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