Journal Article

Detection of opposite polarities in a sunspot light bridge: evidence of low-altitude magnetic reconnection

Lokesh Bharti, Thomas Rimmele, Rajmal Jain, S. N. A. Jaaffrey and R. N. Smartt

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 376, issue 3, pages 1291-1295
Published in print April 2007 | ISSN: 0035-8711
Published online March 2007 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2007.11525.x
Detection of opposite polarities in a sunspot light bridge: evidence of low-altitude magnetic reconnection

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A multiwavelength 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 Fe i 5576 Å, Hα 6563 Å, Fe i 6302.5 Å, and continuum images at 5571 Å. We recorded line-of-sight magnetograms in 6302.5 Å. The observations were taken at the Dunn Solar Telescope at US 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.

Keywords: Sun: chromosphere; Sun: magnetic fields; Sun: photosphere; sunspots

Journal Article.  3119 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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