Plasma Ejections from a Light Bridge in a Sunspot Umbra | Zendy

Ayumi Asai | Zendy; Takako T. Ishii | Zendy; Hiroki Kurokawa | Zendy

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Plasma Ejections from a Light Bridge in a Sunspot Umbra

Author(s) -

Ayumi Asai,

Takako T. Ishii,

Hiroki Kurokawa

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/321738

Subject(s) - coronal mass ejection , sunspot , physics , observatory , astrophysics , plasma , astronomy , solar wind , magnetic field , quantum mechanics

We present conspicuous activities of plasma ejections along a light bridge ofa stable and mature sunspot in NOAA 8971 on 2000 May 02. We found the ejectionsboth 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 obtainedwith the Transition Region and Coronal Explorer (TRACE). Main characteristicsof the ejections are as follows: (1)Ejections occur intermittently andrecurrently, (2)The velocities and the timings of the 171 A-ejections are thesame as those of H-alpha ejections, (3)The appearance of ejections aredifferent from one another, i.e. the H-alpha ejections have jet-likeappearance, while that of 171 A-ejections is like a loop.Comment: 6 pages, 1 table, 4 figure

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