Change search
ReferencesLink to record
Permanent link

Direct link
Stockholm University, Faculty of Science, Department of Astronomy.
2011 (English)In: The Astrophysical Journal Letters, ISSN 2041-8205, Vol. 733, no 2, L38- p.Article in journal (Refereed) Published
Abstract [en]

Reconstructions of total solar irradiance (TSI) rely mainly on linear relations between TSI variation and indices of facular area. When these are extrapolated to the prolonged 15th-17th century Sporer and Maunder solar activity minima, the estimated solar dimming is insufficient to explain the mid-millennial climate cooling of the Little Ice Age. We draw attention here to evidence that the relation departs from linearity at the lowest activity levels. Imaging photometry and radiometry indicate an increased TSI contribution per unit area from small network faculae by a factor of 2-4 compared with larger faculae in and around active regions. Even partial removal of this more TSI-effective network at prolonged minima could enable climatically significant solar dimming, yet be consistent with the weakened but persistent 11 yr cycle observed in Be 10 during the Maunder Minimum. The mechanism we suggest would not alter previous findings that increased solar radiative forcing is insufficient to account for 20th century global warming.

Place, publisher, year, edition, pages
2011. Vol. 733, no 2, L38- p.
Keyword [en]
solar-terrestrial relations, Sun: activity, Sun: faculae, plages, Sun: surface magnetism
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-67556DOI: 10.1088/2041-8205/733/2/L38ISI: 000293135000022OAI: diva2:470754
authorCount :3Available from: 2011-12-29 Created: 2011-12-29 Last updated: 2011-12-29Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Schnerr, Roald
By organisation
Department of Astronomy
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 17 hits
ReferencesLink to record
Permanent link

Direct link