Computer Science
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990sci...247...39r&link_type=abstract
Science (ISSN 0036-8075), vol. 247, Jan. 5, 1990, p. 39-44. Research supported by the Smithsonian Institution and Lowell Observa
Computer Science
75
Brightness Distribution, Solar Activity, Stellar Evolution, Stellar Luminosity, Sunspot Cycle, Nimbus 7 Satellite, Solar Cycles, Solar Magnetic Field, Solar Maximum Mission, Stellar Magnetic Fields
Scientific paper
Radiometric measurements during the past decade from the Solar Maximum Mission and Nimbus 7 satellites have shown that the total solar irradiance varies in step with the sun's 11-year magnetic activity cycle. Stellar observations from the Lowell and Mount Wilson observatories now confirm and elaborate this discovery. These measurements show that older stars similar to the sun tend to become brighter as their magnetic activity level increases, just as the sun does during its 11-year activity cycle. Younger stars, however, tend to become fainter as their magnetic activity level increases. This contrasting behavior suggests that the balance between the competing phenomena that influence solar brightness variability has shifted during the sun's lifetime.
Baliunas Sallie L.
Lockwood Wesley G.
Radick Richard R.
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