Penumbral Waves Driving Solar Fan-shaped Chromospheric Jets
Abstract
We use Hα imaging spectroscopy taken via the Swedish 1 m Solar Telescope to investigate the occurrence of fan-shaped jets at the solar limb. We show evidence for near-simultaneous photospheric reconnection at a sunspot edge leading to the jets appearance, with upward velocities of 30 km s-1, and extensions up to 8 Mm. The brightening at the base of the jets appears recurrent, with a periodicity matching that of the nearby sunspot penumbra, implying running penumbral waves could be the driver of the jets. The jets’ constant extension velocity implies that a driver counteracting solar gravity exists, possibly as a result of the recurrent reconnection erupting material into the chromosphere. These jets also show signatures in higher temperature lines captured from the Solar Dynamics Observatory, indicating a very hot jet front, leaving behind optically thick cool plasma in its wake.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 2018
- DOI:
- 10.3847/2041-8213/aab155
- Bibcode:
- 2018ApJ...855L..19R
- Keywords:
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- Sun: activity;
- Sun: chromosphere;
- Sun: oscillations;
- Sun: photosphere