Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (256) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
· Translate This Page
Magnetic modulation of solar luminosity by photospheric activity
Foukal, P.; Lean, J.
AA(Cambridge Research and Instrumentation, Inc., MA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 1, 1988, p. 347-357. (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Magnetic Effects, Photosphere, Solar Activity, Stellar Luminosity, Faculae, Modulation, Nimbus 7 Satellite, Solar Magnetic Field, Solar Maximum Mission
Bibliographic Code:


The authors study the behavior of slow changes in solar irradiance, S, using measurements obtained with radiometers on the SMM and Nimbus 7 spacecraft. The analysis of the 1978 - 1984 ACRIM and ERB radiometry reveals low-amplitude (0.04% - 0.07%) variations in S on time scales of 4 - 9 months that are well correlated between these two data bases. The variations correlate very well with changes in facular radiations. It is also shown that the slow downtrend in S seen since 1981 by the ACRIM and ERB arises mainly from a decreasing irradiance contribution of bright photospheric magnetic elements outside the large faculae included in the daily CaK plage index. The finding that this network contribution is unbalanced over several years shows that photospheric activity has a net influence on solar luminosity, besides the more nearly balanced contributions of the spots and the large faculae.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences

More Article Retrieval Options

HELP for Article Retrieval

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints