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26 April 2024 |
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Plasma Ejections from a Light Bridge in a Sunspot Umbra | | Ayumi Asai
; Takako T. Ishii
; Hiroki Kurokawa
; | | Date: |
1 Nov 2001 | | Journal: | Astrophysical Journal, 555, L65 | | Subject: | astro-ph | | Affiliation: | 1 and 2), Takako T. Ishii and Hiroki Kurokawa ( Kwasan and Hida Observatories, Kyoto University, Department of Astronomy, Kyoto University | | Abstract: | We present conspicuous activities of plasma ejections along a light bridge of a stable and mature sunspot in NOAA 8971 on 2000 May 02. We found the ejections both in the H-alpha (10^4 K) images obtained with the Domeless Solar Telescope (DST) at Hida Observatory, and in the 171 A (Fe IX/X, ~10^6 K) images obtained with the Transition Region and Coronal Explorer (TRACE). Main characteristics of the ejections are as follows: (1)Ejections occur intermittently and recurrently, (2)The velocities and the timings of the 171 A-ejections are the same as those of H-alpha ejections, (3)The appearance of ejections are different from one another, i.e. the H-alpha ejections have jet-like appearance, while that of 171 A-ejections is like a loop. | | Source: | arXiv, astro-ph/0111021 | | Services: | Forum | Review | PDF | Favorites | |
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