Journal
ASTRONOMY & ASTROPHYSICS
Volume 590, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201528022
Keywords
techniques: imaging spectroscopy; Sun: chromosphere; Sun: photosphere; sunspots
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Funding
- Swedish Research Council
- Swedish National Space Board
- STFC [ST/H000429/1, PP/D002907/1] Funding Source: UKRI
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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.
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