Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240..511w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 2, Dec. 1990, p. 511-514. Research supported by Alexander von Humbold
Astronomy and Astrophysics
Astrophysics
4
Polar Regions, Red Shift, Rotating Plasmas, Solar Rotation, Solar Spectra, Charge Coupled Devices, Image Processing, Light Scattering, Pixels, Solar Limb
Scientific paper
Based on a large amount of spectra taken from the solar polar regions in the northern and southern solar hemisphere with a simultaneous wavelength referencing, the empirical expression for the conventional global solar differential rotation was checked for its reliability near the solar poles. After carefully removing the solar limb red shift and major scattered light effects, the results show a slightly steeper gradient of the differential rotation law as compared to the Howard and Harvey (1970) expression, the standard deviation to theirs being less than 10 m/s. In addition, the reductions indicate a persistent velocity pattern within 10 deg latitude around the poles: a lower velocity of about 200 m/s as compared to the Howard and Harvey (1970) law from 83 to 85 deg and a higher velocity of about 100 m/s from 86 to 89 deg. The pattern existed with very similar details within two observing periods in summer 1989 and spring 1990.
Woehl Hubertus
Ye Bei
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