Time-slice diagrams of solar granulation |
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| Authors: | Müller DAN Steiner O Schlichenmaier R Brandt PN |
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| Institution: | 1.Kiepenheuer-Institut für Sonnenphysik, Sch?neckstra? e 6, D-79104, Freiburg, Germany
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| Abstract: | From a series of 1400 white-light images of solar granulation spanning a time period of 8.2 hours, skeletal plots of time-slice
diagrams are derived showing intergranular lane positions as a function of time. The diagrams permit to automatically track,
classify, and relate 42 186 granules. Recurrently fragmenting granules are found that survive by means of their descendants
for more than 3 hours. Such long-lived active granules tend to have a mean spatial distance along the slice of about 10 Mm.
This distance decreases with decreasing minimal required lifetime. Since active granules are expected to generate a steadily
divergent flow over a long period of time, it is suggested to identify them as a source of the mesogranular flow. Deficiencies
of the time-slice analysis are discussed. The relative frequency of different types of granules and the granule decay time
as derived from the time-slice diagrams are compared with corresponding results of previous works.
Supplementary material to this paper is available in electronic form at http://dx.doi.org/10.1023/A:1013350505080 |
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