Abstract
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°, and the velocity amplitude reaches 0°.4–0°.5 day-1 (60–70 m s-1 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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Grigoryev, V.M., Latushko, S.M. E-W motions of large-scale magnetic field structures of the sun. Sol Phys 140, 239–245 (1992). https://doi.org/10.1007/BF00146311
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DOI: https://doi.org/10.1007/BF00146311