期刊
ASTROPHYSICAL JOURNAL
卷 617, 期 2, 页码 L151-L154出版社
IOP PUBLISHING LTD
DOI: 10.1086/427210
关键词
Sun : activity; Sun : atmospheric motions; Sun : flares; Sun : photosphere; sunspots; techniques : high angular resolution
We present high spatial resolution observations of proper motions in the solar NOAA Active Region 10486 using a high-order adaptive optics system, frame selection, and speckle-masking image reconstruction. The data were obtained with the Dunn Solar Telescope of the National Solar Observatory/Sacramento Peak on 2003 October 29. The resolution of the images approaches the diffraction-limited resolution of the Dunn Solar Telescope of about 0.14 at 527 nm. We analyzed a 2 hr time series with a 1 minute cadence prior to an X10 white-light flare. Local correlation tracking was used to measure the photospheric proper motions. We find specific evidence of strong shear flows along the magnetic neutral line; these shear flows are well defined and correlated with white-light flare kernels in the visible and infrared. The speed along the flow channels can reach up to 1.6 km s(-1), and the separation of channels with head-on flows can be less than 1. Counterstreaming and complex flow patterns have been distinguishing characteristics of this extraordinarily flare-productive active region.
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