Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh13b1985m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH13B-1985
Astronomy and Astrophysics
Astrophysics
[7529] Solar Physics, Astrophysics, And Astronomy / Photosphere, [7599] Solar Physics, Astrophysics, And Astronomy / General Or Miscellaneous
Scientific paper
We present results from a rigorous study of fast granular up flows observed with the Imaging Magnetograph eXperiment (IMaX) aboard the SUNRISE balloon-borne observatory. A time series ˜ 23 minutes long made June 9, 2009 with a cadence of ˜ 33sec and resolution of 0.15--0.18'' was used. Our study concentrates on up flows with a LOS speeds in excess of 2km/s. These flows occur most frequently on the bright areas of the smallest granules, and less so on the bright edges of larger granules. The maximum up flow speed tends to scale with its area which scales with the size of the host granule. The longest-lived up flows are located on larger granules, while shorter-lived ones tend to be located on smaller granules. Results from simulations carried out in other studies suggest that the fastest granular up flows occur chiefly during two scenarios: 1) on the edges of granules when their centers cool, before the granules subsequently split and 2) when a granule is forced under the surface by powerful down flows from adjacent granules. Our observations provide evidence for these results.
Choudhary Debi Prasad
Hirzberger Johann
MacDonald Gordon A.
Solanki Sandeep Singh
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