Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978rech....9..526f&link_type=abstract
La Recherche, vol. 9, June 1978, p. 526-535. In French.
Physics
Solar Activity, Solar Atmosphere, Solar Granulation, Variable Stars, Doppler Effect, Photometry, Solar Magnetic Field, Solar Physics, Stellar Evolution, Stellar Structure, Vibration Mode
Scientific paper
The paper describes supergranules in the solar surface and a local oscillation with a 5-minute frequency in the solar atmosphere. The supergranules can be approximately 30 times the size of the granules and are more stable than the granules, the supergranules persisting more than 10 hours, that is, more than 100 times the lifetime of a granule. While the existence of two systems - granules and supergranules - can not yet be explained by convection theory, the horizontal movements in the supergranules do explain the reticular structure of the solar magnetic field, as the movement from the center to the edge of the supergranule drags the magnetic field to the border. The local oscillations extend a distance of a few thousand meters and persist approximately 20 minutes. The implications of supergranules and local oscillation for an understanding of the external layers of stars are discussed.
Fossat Eric
Souffrin P.
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