Computer Science
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.301..589d&link_type=abstract
Nature, vol. 301, Feb. 17, 1983, p. 589-591.
Computer Science
17
Solar Activity, Solar Oscillations, Solar Rotation, Solar Velocity, Chromosphere, Line Of Sight, Periodic Variations, Photosphere, Velocity Measurement
Scientific paper
Attention is drawn to the close correlation between the approximately 13-day periodicity in measurements of the mean Doppler velocity shift of the integrated solar disk reported by Claverie et al. (1982) and the rotation of solar active regions across the disk. Plage data are used to calculate a mean line-of-sight velocity by weighting the rotational velocity component of each plage by its projected area and estimated brightness. The model signal and the measured velocity signal are remarkably similar. Comparison of the curves implies that the potassium line weakens in active regions. The increased temperature of the photospheric line-forming regions beneath chromospheric plages should indeed weaken the line. Comparison with plage data provides a strong indication that the 13-day line-of-sight velocity signal is related to the passage across the disk of preferred longitudes of solar activity.
Durrant C. J.
Schroeter E. H.
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