E-W motions of large-scale magnetic field structures of the sun

Details E-W motions of large-scale magnetic field structures of the sun E-W motions of large-scale magnetic field structures of the sun

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..140..239g&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 140, no. 2, Aug. 1992, p. 239-245.

Physics

2

Convective Flow, Line Of Sight, Photosphere, Solar Magnetic Field, Solar Observatories, Chebyshev Approximation, Plasma Dynamics

Scientific paper

By applying a new method of processing daily full-disk magnetograms obtained at the Wilcox Solar Observatory at Stanford University, it has become possible to reveal the pattern of global E-W motions of field structures which appears to reflect large-scale convective plasma motions beneath the photosphere. Structures of E-W velocity of different sign extend from north to south, traversing the equator. The extent of the structures in longitude is 25-45 deg, and the velocity amplitude reaches 0.4-0.5 deg/day (60-70 m/s at the equator). Boundaries of E-W flows of different sign correlate with strong, large-scale magnetic field hills. The lifetime of the velocity structures is comparable with that of magnetic field structures.

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