Small Scale Magnetic Flux Emergence Observed with Hinode/Solar Optical Telescope
Kenichi Otsuji, Kazunari Shibata, Reizaburo Kitai, Satoru Ueno,, Shin'ichi Nagata, Takuma Matsumoto, Tahei Nakamura, Hiroko Watanabe, Saku, Tsuneta, Yoshinori Suematsu, Kiyoshi Ichimoto, Toshifumi Shimizu, Yukio, Katsukawa, Theodore D. Tarbell, Bruce W. Lites, Richard A. Shine

TL;DR
This study observed small-scale magnetic flux emergence in a sunspot moat region using Hinode/SOT, revealing detailed dynamics and properties of emerging flux tubes with high-resolution imaging.
Contribution
First detailed observational analysis of small-scale magnetic flux emergence in a sunspot moat region with Hinode/SOT, including flux tube expansion and footpoint separation.
Findings
Footpoints separate at 4.2 km/s initially, slowing to 1 km/s.
Dark lanes and filaments appear almost simultaneously within 2 minutes.
Flux tube expands laterally at 3.8 km/s.
Abstract
We observed small scale magnetic flux emergence in a sunspot moat region by the Solar Optical Telescope (SOT) aboard the Hinode satellite. We analyzed filtergram images observed in the wavelengths of Fe 6302 angstrom, G-band and Ca II H. In Stokes I images of Fe 6302 angstrom, emerging magnetic flux were recognized as dark lanes. In G-band, they showed their shapes almost the same as in Stokes I images. These magnetic flux appeared as dark filaments in Ca II H images. Stokes V images of Fe 6302 angstrom showed pairs of opposite polarities at footpoints of each filament. These magnetic concentrations are identified to correspond to bright points in G-band/Ca II H images. From the analysis of time-sliced diagrams, we derived following properties of emerging flux, which are consistent with the previous works. (1) Two footpoints separate each other at a speed of 4.2 km/s during the initial…
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