Micro-Flare and High-Speed Down-Flow observed with VTT

R.Kano, Y.Katsukawa, Y.Kitakoshi, T.Shimizu, S.Tsuneta and V.Martinez Pillet

In this July, we took the observation time for solar telescopes (VTT, SST and DOT) in Canary islands, and carried out the campaign observation with TRACE and SoHO satellites. On July 9, around the proceeding spot in NOAA 10789 many transient brightenings appeared in EIT images. We continuously observed this spot with spectropolarimeters in Vacuum Tower Telescope (VTT), and made a movie of spectrogram. VTT has two spectropolarimeters, POLIS and TIP2. We observed Fe-6302/6303A with POLIS, and Si-10827A and He-10830A with TIP2. At 13:14UT, a B5.4 flare occurred in the field-of-view. There is a small brightening in EIT image, and small activities in H-alpha images taken with SST. In He-10830A map taken with VTT, high speed (about 20km/s) down-flow transiently appeared near the magnetic neutral line. It seems to be accociated with coronal activity of the micro-flare. In this paper, we study the relation among coronal activities, chromospheric high-speed down-flow observed in He-10830A, and photospheric and chromospheric magnetic structures.

Correspondence

Ryouhei Kano (ryouhei.kano@nao.ac.jp), National Astronomical Observatory of Japan

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