Abstract
view Abstract Citations (97) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Material motions in sunspot umbrae. Beckers, J. M. Abstract Material motions in the umbrae of a number of sunspots have been measured on an absolute scale by means of the g = 0 line of Ti I at 5713 A. It is found that the rates of solar rotation as derived from sunspot proper motions and from spectra are identical to within 1% and that the vertical flow inside umbrae is small, being less than 25 m/s when the pressure shift is ignored. The so-called limb effect is absent in the umbrae leading to an upper limit to the convective energy flux of 0.5% of the radiative energy flux outside sunspots. The position of the line with respect to its laboratory wavelengths is shifted to the red by 613 m/s, in agreement with the predicted gravitational redshift of 636 m/s. Publication: The Astrophysical Journal Pub Date: May 1977 DOI: 10.1086/155222 Bibcode: 1977ApJ...213..900B Keywords: Solar Gravitation; Solar Rotation; Sunspots; Umbras; Convective Flow; Doppler Effect; Radiant Flux Density; Red Shift; Solar Limb; Solar Spectra; Solar Physics full text sources ADS |
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