PENUMBRAL WAVES DRIVING SOLAR FAN-SHAPED CHROMOSPHERIC JETS

Aaron Reid, Vasco Manuel de Jorge Henriques, Michail Mathioudakis, Tanmoy Samanta

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Abstract

We use Hα imaging spectroscopy taken via the Swedish 1-m Solar Telescope (SST) 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 to8 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 (SDO), indicating a very hot jet front, leaving behind optically thick cool plasma in its wake.
Original languageEnglish
Pages (from-to)1-6
JournalAstrophysical Journal Letters
DOIs
Publication statusPublished - 08 Mar 2018

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