Two-dimensional photometry of active regions

Details Two-dimensional photometry of active regions Two-dimensional photometry of active regions

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984siva.work...91l&link_type=abstract

In NASA, Washington Solar Irradiance Variations on Active Region Time Scales p 91-96 (SEE N84-27635 17-92)

Astronomy and Astrophysics

Astronomy

Astronomical Observatories, Irradiance, Solar Activity Effects, Data Reduction, Image Processing, Limb Darkening, Photometers, Signal To Noise Ratios, Time Series Analysis

Scientific paper

A set of two dimensional photometric images of solar active regions (AR's) are described. Preliminary analysis of the data is described, and estimates are presented of the contribution of an AR to total solar irradiance variations during its 1982 August 3 to 16 disk passage. Results indicate an excess contribution near the limb and a deficit away from the limb. Also apparent is an evolutionary change in the AR which is represented as a decrease in sunspot area.

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