Velocity fields of individual supergranules

Physics

Scientific paper

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26

Astronomical Maps, Convective Flow, Mass Flow Rate, Solar Granulation, Velocity Distribution, Contours, Coriolis Effect, Flow Distribution, Flow Velocity, Solar Physics

Scientific paper

The velocity field of the Ca(+) K network is measured at different heliocentric angles using a 100 x 100 photodiode array and a set of slit positions separated by 2.5 arcsec. In order to eliminate the five-minute oscillation, the integration time was chosen to 10 min. It is found that the correlation between the network cells and the supergranular velocity cells amounts to 85 percent on the average. Supergranules near the disk center typically show a central upflow about 70 m/s maximum, corresponding to a massflow of about 10 to the 15th cu m/s. At the boundary of the network a downflow appears to exist only statistically. The maximum velocity of the horizontal component is about 400 m/s; a layer of one scale height thickness is sufficient to account for the horizontal flow to balance the observed vertical mass flow at cell center. The majority of the cells show a small scale structure of their horizontal velocity fields. Some indications for the influence of Coriolis forces have been found.

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