Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1812p&link_type=abstract
American Astronomical Society, SPD meeting #42, #18.12; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We examine the effects of active regions on the relative brightness of the solar disk at three different wavelengths. Our study is based on photometric parameters derived from images taken at the San Fernando Observatory, and examines daily data for two full solar cycles. We measure the contrast of solar features on broadband red and blue images, and on Ca II K-line images, which allows us to compute the net brightness variations due to solar activity. We show that while the Ca II K-line variability is directly correlated with the solar activity cycle, variability in the red and blue continuum is anti-correlated with solar activity, on solar cycle timescales. Our blue and red continuum filters are quite similar to the Stromgren b and y filters used to measure stellar photometric variability. Sun-like stars whose continuum brightness varies inversely with activity are therefore revealed to be similar to the Sun.
This work has been supported in part by NASA LWS Grant NNX07AT19G and NSF Grant ATM-0848518.
Chapman Gary
Cookson Angela
Preminger Dora
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