Photometric determination of facular contrasts near the solar disk center

Details Photometric determination of facular contrasts near the solar disk center Photometric determination of facular contrasts near the solar disk center

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324.1184l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. 1184-1193.

Astronomy and Astrophysics

Astrophysics

27

Faculae, Photometry, Photosphere, Solar Activity, Calcium, Continuous Spectra, Pixels, Spectroheliographs

Scientific paper

The authors have analyzed pairs of simultaneous, co-registered, digital, photometric images of several solar active regions made with 3 Å effective bandpasses in the Ca II line at 8662 Å and in the nearby clean continuum at 8642 or 8682 Å. From these data the authors derive a continuum facular contrast at disk center of 0.74%±0.11%. This contrast remains roughly constant from disk center to r = 0.45 R_sun; before increasing. These results lead to an increase of 10% - 20% in earlier estimates of facular contributions to solar luminosity fluctuations, which were found to be 70% - 120% of the sunspot contributions.

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