Small-scale chromospheric jets above a sunspot light bridge
Rohan E. Louis, Christian Beck, Kiyoshi Ichimoto

TL;DR
This study investigates small-scale, dynamic chromospheric jets above a sunspot light bridge, revealing their morphology, magnetic environment, and likely reconnection-driven origin using high-resolution Hinode observations.
Contribution
It provides detailed observational evidence linking chromospheric jets to magnetic field divergence and reconnection events near a sunspot light bridge, a novel insight into their physical driver.
Findings
Jets are mostly less than 1000 km in length.
Jets are guided by magnetic field lines and often associated with magnetic reconnection.
No clear correlation between jets and photospheric flow patterns.
Abstract
High-resolution broadband filtergrams of active region NOAA 11271 in Ca ii H and G band were obtained with the Solar Optical Telescope on board Hinode to identify the physical driver responsible for the dynamic and small-scale chromospheric jets above a sunspot light bridge. We identified the jets in the Ca images using a semi-automatic routine. The chromospheric jets consist of a bright, triangular-shaped blob that lies on the light bridge, while the apex of this blob extends into a spike-like structure that is bright against the dark umbral background. Most of the jets have apparent lengths of less than 1000 km and about 30% of them have lengths between 1000-1600 km. They are oriented within +/-35 deg. to the normal of the light bridge axis. Many of them are clustered near the central part within a 2 arcsec area. The jets are seen to move rapidly along the light bridge and most of…
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