NST and Photospheric Fine -scale Structures Indicating the Small Scale Flux Emergence in an Active Region

Details NST and Photospheric Fine -scale Structures Indicating the Small Scale Flux Emergence in an Active Region NST and Photospheric Fine -scale Structures Indicating the Small Scale Flux Emergence in an Active Region

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0604l&link_type=abstract

American Astronomical Society, SPD meeting #42, #6.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

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We have studied very small-scale flux emergence events on granular scales in a solar active region. The New Solar Telescope of Big Bear Solar Observatory made it possible to clearly observe the photospheric signature of flux emergence with a very high spatial (0".034/pixel) and temporal (15s) resolution. From the TiO observations, we found several elongated thread-like granules protruding from the penumbral filaments of a sunspot at a relatively high speed of over 4km s-1. A slender arched darkening protrudes from the tip of the penumbral filament, then quickly stretches its length along the intergranular lane with a slight bright point developing at the previously shaded leading edge. The size of such granules is approximately 0".5 wide and 3” long, and their stretching lasts for several minutes before contacting other magnetic structures nearby. Magnetograms from HMI/SDO and IRIM/BBSO show that such elongated granules are photospheric indicators of small-scale flux emergence. The cancellation process is also described in detail for two events that show different chromospheric signatures, such as brightenings and jets during the cancellation. We speculate that subsurface connectivity and the depth of the roots of magnetic field are the main keys to determining different cancellation phenomena.

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