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Magnetic modulation of solar luminosity by photospheric activityThe behavior of slow changes in solar irradiance S is studied using measurements obtained with radiometers on the SMM and Nimbus 7 spacecraft. The general downtrend in the radiometer readings is examined by removing the influence of sunspot blocking and comparing the residual irradiance variations with changes in facular and network radiation as indicated by the He I 10830 and CaK indices. The time-integrated sunspot and facular contributions to irradiance variation and its implications for active region energetics are considered. The magnetic activity modulation of S over solar cycle 21 from daily data on sunspot blocking and the He I index are simulated, and this simulated irradiance variation is compared to radiometry since 1978. Other recent evidence for an irradiance modulation by magnetic activity is discussed.
Document ID
19880046311
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Foukal, P.
(Cambridge Research and Instrumentation, Inc. MA, United States)
Lean, J.
(Cambridge Research and Instrumentation, Inc. Cambridge, MA, United States)
Date Acquired
August 13, 2013
Publication Date
May 1, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 328
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
88A33538
Funding Number(s)
CONTRACT_GRANT: NAS5-29349
CONTRACT_GRANT: NSF ATM-85-191
CONTRACT_GRANT: N00014-86-C-2230
Distribution Limits
Public
Copyright
Other

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