Magnetic Flux Cancellation in Ellerman Bombs

Reid, Aaron, Mathioudakis, Mihalis, Doyle, John Gerard, Scullion, Eamon, Nelson, Chris, Henriques, Vasco and Ray, Tom (2016) Magnetic Flux Cancellation in Ellerman Bombs. The Astrophysical Journal, 823 (2). pp. 110-120. ISSN 1538-4357

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Official URL: http://dx.doi.org/10.3847/0004-637X/823/2/110

Abstract

Ellerman Bombs (EBs) are often found to be co-spatial with bipolar photospheric magnetic fields. We use Hα imaging spectroscopy along with Fe i 6302.5 Å spectropolarimetry from the Swedish 1 m Solar Telescope (SST), combined with data from the Solar Dynamic Observatory, to study EBs and the evolution of the local magnetic fields at EB locations. EBs are found via an EB detection and tracking algorithm. Using NICOLE inversions of the spectropolarimetric data, we find that, on average, (3.43 ± 0.49) × 10^24 erg of stored magnetic energy disappears from the bipolar region during EB burning. The inversions also show flux cancellation rates of 10^14–10^15 Mx s−1 and temperature enhancements of 200 K at the detection footpoints. We investigate the near-simultaneous flaring of EBs due to co-temporal flux emergence from a sunspot, which shows a decrease in transverse velocity when interacting with an existing, stationary area of opposite polarity magnetic flux, resulting in the formation of the EBs. We also show that these EBs can be fueled further by additional, faster moving, negative magnetic flux regions.

Item Type: Article
Uncontrolled Keywords: magnetic reconnection; Sun: atmosphere; Sun: magnetic fields; Sun: photosphere
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 29 Jun 2016 09:08
Last Modified: 27 May 2017 06:37
URI: http://nrl.northumbria.ac.uk/id/eprint/27195

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