Liu, J. orcid.org/0000-0003-2569-1840, Erdélyi, R., Wang, Y. et al. (1 more author) (2017) Untwisting Jets Related to Magnetic Flux Cancellation. The Astrophysical Journal, 852 (1). 10. ISSN 0004-637X
Abstract
The rotational motion of solar jets is believed to be a signature of the untwisting process resulting from magnetic reconnection, which takes place between twisted closed magnetic loops (i.e., magnetic flux ropes) and open magnetic field lines. The identification of the pre-existing flux rope, and the relationship between the twist contained in the rope and the number of turns the jet experiences, are then vital in understanding the jet-triggering mechanism. In this paper, we will perform a detailed analysis of imaging, spectral, and magnetic field observations of four homologous jets, among which the fourth one releases a twist angle of 2.6π. Nonlinear force-free field extrapolation of the photospheric vector magnetic field before the jet eruption presents a magnetic configuration with a null point between twisted and open fields—a configuration highly in favor of the eruption of solar jets. The fact that the jet rotates in the opposite sense of handness to the twist contained in the pre-eruption photospheric magnetic field confirms the unwinding of the twist by the jet's rotational motion. The temporal relationship between jets' occurrence and the total negative flux at their source region, together with the enhanced magnetic submergence term of the photospheric Poynting flux, shows that these jets are highly associated with local magnetic flux cancellation.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017. The American Astronomical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Solar and Stellar Astrophysics (astro-ph.SR) |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Funding Information: | Funder Grant number SCIENCE AND TECHNOLOGY FACILITIES COUNCIL ST/M000826/1 THE ROYAL SOCIETY IE141493 ROYAL SOCIETY IE161153 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 24 Nov 2017 16:18 |
Last Modified: | 08 Feb 2018 10:45 |
Published Version: | https://doi.org/10.3847/1538-4357/aa992d |
Status: | Published |
Publisher: | American Astronomical Society |
Refereed: | Yes |
Identification Number: | 10.3847/1538-4357/aa992d |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:124473 |