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24 April 2024 |
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Formation Process of a Light Bridge Revealed with the Hinode Solar Optical Telescope | | Y. Katsukawa
; T. Yokoyama
; T. E. Berger
; K. Ichimoto
; M. Kubo
; B. W. Lites
; S. Nagata
; T. Shimizu
; R. A. Shine
; Y. Suematsu
; T. D. Tarbell
; A. M. Title
; S. Tsuneta
; | | Date: |
17 Sep 2007 | | Abstract: | The Solar Optical Telescope (SOT) aboard HINODE successfully and continuously
observed a formation process of a light bridge in a matured sunspot of the NOAA
active region 10923 for several days with high spatial resolution. During its
formation, many umbral dots were observed emerging from the leading edges of
penumbral filaments, and intruding into the umbra rapidly. The precursor of the
light bridge formation was also identified as the relatively slow inward motion
of the umbral dots which emerged not near the penumbra, but inside the umbra.
The spectro-polarimeter on SOT provided physical conditions in the photosphere
around the umbral dots and the light bridges. We found the light bridges and
the umbral dots had significantly weaker magnetic fields associated with
upflows relative to the core of the umbra, which implies that there was hot gas
with weak field strength penetrating from subphotosphere to near the visible
surface inside those structures. There needs to be a mechanism to drive the
inward motion of the hot gas along the light bridges. We suggest that the
emergence and the inward motion are triggered by a buoyant penumbral flux tube
as well as the subphotospheric flow crossing the sunspot. | | Source: | arXiv, 0709.2527 | | Services: | Forum | Review | PDF | Favorites | |
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