On the solar rotation elements i and Omega as determined by Doppler velocity measurements of the solar plasma

Details On the solar rotation elements i and Omega as determined by Doppler velocity measurements of the solar plasma On the solar rotation elements i and Omega as determined by Doppler velocity measurements of the solar plasma

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62..165w&link_type=abstract

Astronomy and Astrophysics, vol. 62, no. 1-2, Jan. 1978, p. 165-177. Research supported by the Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

13

Doppler Effect, Solar Rotation, Solar Wind Velocity, Wind Velocity Measurement, Angular Velocity, Atmospheric Circulation, Data Reduction, Solar Atmosphere, Solar Magnetic Field, Tables (Data)

Scientific paper

Two methods of deriving the solar rotation elements are discussed. The procedures rely on Doppler velocity measurements of the solar plasma for determining the angle between the ecliptic and the solar equator and the angle between the crosspoint of the solar equator with the ecliptic and the equinox point. Both methods are mainly based on the solar differential rotation. The first method depends on the determination of the maximum of the differential rotation velocity as well as on recently detected humps in the shape of the differential rotation velocity. The second method makes use of the full shape of the differential rotation velocity. The derived solar rotation elements are i equals (6.77 plus or minus 0.31) deg and Omega equals (76.31 plus or minus 0.65) deg for 1976. It is suggested that these results do not indicate a difference of the mean plasma rotation as compared with the mean rotation of sunspots but that the values of i and Omega derived from motions of sunspots more than 100 years ago (Carrington, 1863) should be corrected.

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