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PHYSICAL CONDITIONS IN SUNSPOTS
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absorption analyser angle aperture appearance Astron Astrophys Babcock bipolar group Bray and Loughhead Bumba chromospheric components convection Crimean Astrophysical Observatory derived described in Section diaphragm direction discussed in Section disk distribution Dollfus equation Evershed effect exposure faculae field strength filaments flares flux Fraunhofer lines gauss given illustrated in Plate intensity Kliiber km/sec large spot lifetime light-bridge limb line-of-sight longitudinal loop magnetograph maximum measurements Michard motion Mt Wilson observations Observatory obtained optical depth penumbra period photographs photoheliograph photospheric granules polarimeter polarization present Refractor resolution rotation scattered light Severny slit solar cycle solar granulation solar image solar telescope spectral spectrograph spectroheliograph spectrum spot groups stars Stepanov structure of sunspot sunspot fields sunspot groups sunspot magnetic fields sunspot number sunspot umbrae Table technique temperature theory tion umbral granules variation velocity visible Waldmeier wavelength width Wilson effect Zeeman effect Zeeman splitting Zeeman triplet