Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316l..91s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 316, May 15, 1987, p. L91-L94.
Astronomy and Astrophysics
Astrophysics
17
Flow Velocity, Meridional Flow, Rotating Fluids, Solar Cycles, Solar Oscillations, Magnetic Fields, Solar Activity, Solar Corona
Scientific paper
A migrating pattern of solar surface motions associated with the torsional oscillation is revealed through the analysis of latitudinal 'zero offset' data from Mount Wilson full-disk Dopplergrams taken over the past 19 yr. This new pattern, which registers meridional flow in high latitudes and vertical flow in low latitudes, contains a line-of-sight velocity signal of about + or - 4 m/s. The vertical, meridional, and rotational flows, taken together, constitute the pattern of surface motions expected from a system of giant azimuthal rolls. The implication is that there is a system of from three to four rolls per hemisphere, which migrate from near the poles to the equator over a period of about 18 yr. This observational result provides strong supporting evidence for recent azimuthal convective-roll models of the solar cycle.
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