Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-24
Mon.Not.Roy.Astron.Soc.376:1291-1295,2007
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures. Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2007.11525.x
A multi-wavelength photometric analysis was performed in order to study the sub-structure of a sunspot light bridge in the photosphere and the chromosphere. Active region NOAA 8350 was observed on 1998 October 8. The data consist of a 100 min time series of 2D spectral scans of the lines FeI 5576, H-alpha 6563, FeI 6302.5, and continuum images at 5571. We recorded line-of-sight magnetograms in 6302.5. The observations were taken at the Dunn Solar Telescope at U. S. National Solar Observatory, Sacramento Peak. We find evidence for plasma ejection from a light bridge followed by Ellerman bombs. Magnetograms of the same region reveal opposite polarity in light-bridge with respect to the umbra. These facts support the notion that low altitude magnetic reconnection can result in the magnetic cancellation as observed in the photosphere.
Bharti Lokesh
Jain Rajmal
Rimmele Thomas
Smartt Raymond N.
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