Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...84...33f&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 84, April 1983, p. 33-44. 24.
Physics
21
Convective Flow, Radiant Flux Density, Sunspots, Thermal Diffusivity, Faculae, Fraunhofer Lines, Photosphere, Raster Scanning, Spectral Line Width, Stellar Models, Stellar Spectrophotometry
Scientific paper
Raster-scan observations of 10 sunspots, made in 1980 and 1981 with the 512-channel diode array and vacuum telescope at the Kitt Peak National Observatory, are reported. Data from several 10-min scans of 0.25-A passbands of clean continuum were summed to give an rms noise level of 0.25 percent, corrected by applying a limb-darkening curve, and analyzed to determine the average intensity for each of eight segments of a series of concentric rings around each sunspot. Faculae and pores were identified and discarded in constructing radial intensity profiles. Marginally significant bright symmetric rings (peak amplitude 0.1-0.3 percent) not attributable to residual facular signal or instrumental effects were observed around 6 of 10 sunspots. No evidence of more intense bright rings was found. These findings are discussed in terms of thermal-diffusion models proposed to explain the fate of the radiative flux blocked by sunspots.
Duvall Jr. T.
Foukal Peter
Fowler Lee A.
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