On the determination of heliographic positions and rotation velocities of sunspots. III - Effects caused by wrong solar image radii and their corrections

Details On the determination of heliographic positions and rotation velocities of sunspots. III - Effects caused by wrong solar image radii and their corrections On the determination of heliographic positions and rotation velocities of sunspots. III - Effects caused by wrong solar image radii and their corrections

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...91...55b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 91, March 1984, p. 55-59.

Physics

7

Angular Velocity, Error Analysis, Image Analysis, Position (Location), Spectroheliographs, Sunspots, Astrometry, Radii, Solar Rotation

Scientific paper

The effect of incorrect solar-image radius on the determination of the rotation velocity of sunspots is analyzed by comparing data collected at Sonnenobservatorium Kanzelhoehe with those from Locarno and Greenwich (for May and September, 1982, and for 27 stable recurrent sunspots during 1950-1976, respectively). While the Locarno data are insufficient to draw quantitative conclusions, the Kanzelhoehe/Greenwich comparison reveals a time-independent discrepancy of 0.004 deg/day, corresponding to a velocity difference of less than 1 m/s, from the 'true' values determined from successive passages through the central meridian.

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