Physics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.297..208l&link_type=abstract
Nature, vol. 297, May 20, 1982, p. 208, 209.
Physics
64
Convection, Solar Granulation, Solar Magnetic Field, Solar Radiation, Stellar Luminosity, Fraunhofer Lines, Magnetic Flux, Photosphere, Solar Activity, Solar Cooling, Solar Interior, Solar Spectra, Spectroheliographs
Scientific paper
Model calculations universally indicate that heat transport from the solar interior is almost entirely by convection in the outer envelope. Spiegel and Weiss (1980) have recently discussed how magnetic fields can intrude into this envelope to affect convection and thus introduce transients into the sun's luminosity. Fourier transform spectrometer observations of Fraunhofer line asymmetry are used to demonstrate that granular convection is retarded in the presence of surface magnetism. Full disk observations are presented which suggest a lessening of convection over the past 5 yr. As this time interval coincides with the rise from a minimum to a maximum of solar activity, with the presumed injection of new magnetic flux from the interior, the resolved disk and full disk observations are consistent. Finally, the continued temporal decrease in the spectroscopic temperature of the low photosphere is noted and a relation between a change of convection and the lowering temperature is considered.
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