Separation of large-scale photospheric Doppler patterns

Details Separation of large-scale photospheric Doppler patterns Separation of large-scale photospheric Doppler patterns

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...94...13s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 94, Aug. 1984, p. 13-31.

Physics

135

Photosphere, Solar Limb, Solar Rotation, Crosstalk, Doppler Effect, Line Of Sight, Meridional Flow, Solar Velocity

Scientific paper

Mount Wilson solar Doppler data spanning January 1967 to March 1984 are refit with an expanded set of functions representing the line-of-sight components of rotation, limbshift and meridional flow. The long-standing problem of crosstalk among the fit-determined coefficients is eliminated by orthonormalization with respect to the solar disk of the function space representing each motion class. Examination of the new coefficients shows clear evidence for their variation over the solar cycle: for the rotation coefficients, this variation is a low mode torsional oscillation, and for the limbshift, it appears consistent with the suppression of small-scale convection by magnetic activity. The meridional flow is found to be poleward and slightly faster at low latitudes.

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