2017/10/23 by Takahito Sakaue, Akiko Tei, Ayumi Asai +4 · 1 citation
Computer Science · Engineering · Medicine · Physics and Astronomy · #Acoustics #Astronomy #Astrophysics #Dynamics (music) #Electrohydrodynamics and Fluid Dynamics #Jet (fluid) #Mechanics #Medicine #Observational study #Physics #Solar Radiation and Photovoltaics #Solar and Space Plasma Dynamics #Spectral analysis #Spectroscopy #astro-ph.SR
paper · pdf · doi:10.1093/pasj/psx133
21 pages, 22 figures, accepted for publication in PASJ
arxiv created 2017/10/23 · openalex publication_date 2017/10/29 · openalex created_date 2017/11/10 · arxiv updated 2018/01/31 · openalex updated_date 2026/08/06
Abstract We report on a solar jet phenomenon associated with the C5.4 class flare on 2014 November 11. The data of the jet was provided by the Solar Dynamics Observatory, the X-Ray Telescope (XRT) aboard Hinode, and the Interface Region Imaging Spectrograph and Domeless Solar Telescope (DST) at Hida Observatory, Kyoto University. These plentiful data enabled us to present this series of papers to discuss all the processes of the observed phenomena, including energy storage, event trigger, and energy release. In this paper, we focus on the energy release process of the observed jet, and mainly describe our spectral analysis on the Hα data of DST to investigate the internal structure of the Hα jet and its temporal evolution. This analysis reveals that in the physical quantity distributions of the Hα jet, such as line-of-sight velocity and optical thickness, there is a significant gradient in the direction crossing the jet. We interpret this internal structure as the consequence of the migration of the energy release site, based on the idea of ubiquitous reconnection. Moreover, by measuring the horizontal flow of the fine structures in the jet, we succeeded in deriving the three-dimensional velocity field and the line-of-sight acceleration field of the Hα jet. The analysis result indicates that part of the ejecta in the Hα jet experienced additional acceleration after it had been ejected from the lower atmosphere. This secondary acceleration was found to occur in the vicinity of the intersection between the trajectories of the Hα jet and the X-ray jet observed by Hinode/XRT. We propose that a fundamental cause of this phenomenon is magnetic reconnection involving the plasmoid in the observed jet.