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Spatial dependence of solar-cycle changes in the sun's luminosity

Taylor, S. F. and Varsik, J. R. and Woodard, M. F. and Libbrecht, K. G. (1998) Spatial dependence of solar-cycle changes in the sun's luminosity. Solar Physics, 178 (1). pp. 1-12. ISSN 0038-0938. doi:10.1023/a:1004974425975.

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We report observations of the large-scale spatial dependence of the Sun's luminosity variations over the period 1993–1995. The measurements were made using a new scanning disk solar photometer at Big Bear Solar Observatory, specially designed to measure large-scale brightness variations at the 10⁻⁴ level. Since the level of solar activity was very low for the entire observation period, the data show little solar cycle variation. However, the residual brightness signal ΔI/I (after subtracting the mean, first, and second harmonics) does show a strong dependence on heliocentric angle, peaking near the limb. This is as one would expect if the residual brightness signal (including the excess brightness coming from the active latitudes) were primarily facular in origin. Additional data over the next few years, covering the period from solar minimum to maximum, should unambiguously reveal the large-scale spatial structure of the solar cycle luminosity variations.

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Libbrecht, K. G.0000-0002-8744-3298
Additional Information:© 1998 Kluwer Academic Publishers. Received 21 January 1997; accepted 15 July 1997. This project was supported by the NSF and NASA.
Funding AgencyGrant Number
Subject Keywords:Spatial Structure, Solar Activity, Solar Cycle, Spatial Dependence, Solar Minimum
Issue or Number:1
Record Number:CaltechAUTHORS:20200722-163250907
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Official Citation:Taylor, S.F., Varsik, J.R., Woodard, M.F. et al. Spatial Dependence of Solar-Cycle Changes in the Sun's Luminosity. Solar Physics 178, 1–12 (1998).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104522
Deposited By: Rebecca Minjarez
Deposited On:23 Jul 2020 16:10
Last Modified:16 Nov 2021 18:32

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