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Study of peacock jets observed above a sunspot light-bridge: results and techniques
Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0002-0950-9335
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: Stockholm University, 2016. , p. 65
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-136516OAI: oai:DiVA.org:su-136516DiVA, id: diva2:1054745
Available from: 2020-01-21 Created: 2016-12-09 Last updated: 2020-03-18Bibliographically approved
List of papers
1. Fan-shaped jets above the light bridge of a sunspot driven by reconnection
Open this publication in new window or tab >>Fan-shaped jets above the light bridge of a sunspot driven by reconnection
2016 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 590, article id 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.

Keywords
techniques: imaging spectroscopy, Sun: chromosphere, Sun: photosphere, sunspots
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Astronomy
Identifiers
urn:nbn:se:su:diva-132496 (URN)10.1051/0004-6361/201528022 (DOI)000378106800086 ()
Available from: 2016-08-17 Created: 2016-08-15 Last updated: 2020-01-30Bibliographically approved

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Robustini, Carolina
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