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Abstract: We report the discovery of isolated, small-scale emerging magnetic fields ina plage region with the Solar Optical Telescope aboard Hinode.Spectro-polarimetric observations were carried out with a cadence of 34 secondsfor the plage region located near disc center. The vector magnetic fields areinferred by Milne-Eddington inversion. The observations reveal widespreadoccurrence of transient, spatially isolated horizontal magnetic fields. Thelateral extent of the horizontal magnetic fields is comparable to the size ofphotospheric granules. These horizontal magnetic fields seem to be tossed aboutby upflows and downflows of the granular convection. We also report an eventthat appears to be driven by the magnetic buoyancy instability. We refer tobuoyancy-driven emergence as type1 and convection-driven emergence as type2.Although both events have magnetic field strengths of about 600 G, the fillingfactor of type1 is a factor of two larger than that of type2. Our findingsuggests that the granular convection in the plage regions is characterized bya high rate of occurrence of granular-sized transient horizontal fields.

Author: R. Ishikawa, S. Tsuneta, K. Ichimoto, H. Isobe, Y. Katsukawa, B. W. Lites, S. Nagata, T. Shimizu, R. A. Shine, Y. Suematsu, T. D.


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