A Caltech Library Service

Spatial and temporal variations in the solar brightness

Woodard, M. F. and Libbrecht, K. G. (2003) Spatial and temporal variations in the solar brightness. Solar Physics, 212 (1). pp. 51-64. ISSN 0038-0938. doi:10.1023/a:1022952206013.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


We have investigated long-term variations of solar brightness as a function of both time and solar latitude using eight years of ground-based photometric data in conjunction with space-based irradiance data. In particular, we have examined whether the combination of sunspot brightness deficits and facular brightness excesses is sufficient to explain the solar cycle irradiance variations. After correcting for the contribution from sunspots, we find that the irradiance data can be adequately explained by a model in which the remaining brightness variations are due entirely to facular contributions confined to the magnetically active latitudes. Thus we find no support for the hypothesis that there are convectively driven hot bands in the active latitudes, and our data show brightness variations that are well described by a facular contrast function.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Libbrecht, K. G.0000-0002-8744-3298
Additional Information:© Kluwer Academic Publishers 2003. (Received 11 April 2002; accepted 12 September 2002) This work was supported by grants from the NSF and NASA. The BBSO observations were carried out over several years by Bill Marquette, Randy Fear, Jeff Nenow, John Varsik, and others. Unpublished data from the VIRGO Experiment on the cooperative ESA/NASAMission SOHO (data composite_d19.asc) were obtained from PMOD/WRC, Davos, Switzerland (Fröhlich and Lean 1998). ACRIM composite data (composite_na3.htm) obtained from Data from Lean et al., (1998) were kindly supplied by J. Lean.
Funding AgencyGrant Number
Subject Keywords:Temporal Variation; Solar Cycle; Brightness Variation; Photometric Data; Contrast Function
Issue or Number:1
Record Number:CaltechAUTHORS:20190909-133031536
Persistent URL:
Official Citation:Woodard, M. & Libbrecht, K. Sol Phys (2003) 212: 51.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98526
Deposited By: George Porter
Deposited On:09 Sep 2019 23:10
Last Modified:16 Nov 2021 17:39

Repository Staff Only: item control page