On the experimental determination of the north direction of a heliogram

Details On the experimental determination of the north direction of a heliogram On the experimental determination of the north direction of a heliogram

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..140..199g&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 140, no. 1, July 1992, p. 199-202.

Physics

2

Position Errors, Spectroheliographs, Sunspots, Imaging Techniques, Instrument Compensation, Taylor Series

Scientific paper

A method is introduced for deriving the orientation of north in a heliogram with an accompanying reduction of measurements. The method employs the following parameters: (1) the pole distance of the hour angle axis; (2) the hour angle of the sun and the hour axis; (3) and the angles between the declination axis and the optical axis and the hour angle axis of the heliograph; and (4) the declination of the sun, among others. A slow change in the alignment of the heliograph parameters is compensated for with corrections and revisions of the parameters.

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