On Photospheric Flows and Chromospheric Corks
作者： P. N. Brandt , R. J. Rutten , R. A. Shine , J. Trujillo Bueno
DOI: 10.1007/978-94-011-1188-1_22
关键词: Tracking (particle physics) 、 Image sequence 、 Supergranulation 、 Lower limit 、 Telescope 、 Filter (large eddy simulation) 、 Physics 、 Astronomy 、 Solar photosphere 、 Flow pattern
摘要: Proper motions of granules are measured by local correlation tracking on a 4.5 h image sequence obtained with the Swedish Vacuum Tower Telescope at La Palma. A 2 arcsec spatial low-pass filter is applied to obtain meso-scale flow patterns. We find that their characteristic lifetime (1/e value) has lower limit five six hours. Comparison simultaneous co-spatial chromospheric Ca II K2V images shows these flows sweep supergranulation cells clean in about same period. “persistent flasher”, seen during three hours , migrates magnetic network as if it were photospheric cork.
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