Physics – Optics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh31b..06d&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH31B-06
Physics
Optics
7509 Corona, 7519 Flares, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835), 7529 Photosphere
Scientific paper
We present high resolution observations of horizontal flow fields measured by Local Correlation Tracking from intensity images in three wavelengths, i.e., G-Band (GB), White-Light (WL), and Near InfraRed (NIR). The observations were obtained on 2003 October~29 within the flaring super active region NOAA~10486, which was the source of several X-class flares, including an X10 flare that occurred near the end of the observing run. The data were obtained at National Solar Observatory/Sacramento Peak (NSO/SP) using the newly developed high-order Adaptive Optics (AO) system. We also use Dopplergrams and magnetograms from MDI on board SOHO to study the line-of-sight flow and magnetic field. We observe persistent and long-lived (at least 5 hours) strong horizontal and vertical shear flows (both in the order of 1 km s-1) along the magnetic Neutral Line (NL) until the X10 flare occurred. From lower photospheric level (NIR), the direction of the flows does not change up to the upper photosphere (GB), while the flow speeds in the shear motion regions decrease and on the contrary those in regions without shear motions increase with increasing altitude. Right after the X10 flare, the magnetic gradient decreased, while both horizontal and vertical shear flows dramatically enhanced near the flaring NL. Our results suggest that photospheric shear flows and local magnetic shear near the NL can increase after the flare, which may be the result of shear release in the overlying large-scale magnetic system or the reflection of a twisted or sheared flux emergence carrying enough energy from subphotosphere.
Cao Weiqun
Deng Nimao
Denker Carsten
Liu Chan Chiang
Rimmele Thomas R.
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