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Fan-shaped jets above the light bridge of a sunspot driven by reconnection
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
Number of Authors: 4
2016 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 590, A57Article in journal (Refereed) Published
Abstract [en]

We report on a fan-shaped set of high-speed jets above a strongly magnetized light bridge (LB) of a sunspot observed in the H alpha line. We study the origin, dynamics, and thermal properties of the jets using high-resolution imaging spectroscopy in H alpha from the Swedish 1m Solar Telescope and data from the Solar Dynamics Observatory and Hinode. The H alpha jets have lengths of 7-38 Mm, are impulsively accelerated to a speed of similar to 100 km s(-1) close to photospheric footpoints in the LB, and exhibit a constant deceleration consistent with solar effective gravity. They are predominantly launched from one edge of the light bridge, and their footpoints appear bright in the H alpha wings. Atmospheric Imaging Assembly data indicates elongated brightenings that are nearly co-spatial with the H alpha jets. We interpret them as jets of transition region temperatures. The magnetic field in the light bridge has a strength of 0.8-2 kG and it is nearly horizontal. All jet properties are consistent with magnetic reconnection as the driver.

Place, publisher, year, edition, pages
2016. Vol. 590, A57
Keyword [en]
techniques: imaging spectroscopy, Sun: chromosphere, Sun: photosphere, sunspots
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-132496DOI: 10.1051/0004-6361/201528022ISI: 000378106800086OAI: diva2:953207
Available from: 2016-08-17 Created: 2016-08-15 Last updated: 2016-08-17Bibliographically approved

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Robustini, CarolinaLeenaarts, Jorritde la Cruz Rodriguez, Jaime
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