TY - JOUR
T1 - RESOLVING THE FAN-SPINE RECONNECTION GEOMETRY OF A SMALL-SCALE CHROMOSPHERIC JET EVENT WITH THE NEW SOLAR TELESCOPE
AU - Zeng, Zhicheng
AU - Chen, Bin
AU - Ji, Haisheng
AU - Goode, Philip R.
AU - Cao, Wenda
N1 - Funding Information:
The BBSO operation is supported by NJIT, US NSF AGS-1250818, and NASA NNX13AG14G grants. The NST operation is partly supported by the Korea Astronomy and Space Science Institute, Seoul National University, and the strategic priority research program of CAS with grant No. XDB09000000. We thank Antonia Savcheva and Hui Tian for helpful discussions. We acknowledge the support of the US NSF AGS-0847126, NSFC-11333009, NSFC-11428309, AFOSR (FA 9550-15-1-0322), and NASA under contract SP02H1701R from Lockheed-Martin to SAO, and contract NNM07AB07C to SAO.
Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.
PY - 2016/3/1
Y1 - 2016/3/1
N2 - Jets are ubiquitously present in both quiet and active regions on the Sun. They are widely believed to be driven by magnetic reconnection. A fan-spine structure has been frequently reported in some coronal jets and flares, and has been regarded as a signature of ongoing magnetic reconnection in a topology consisting of a magnetic null connected by a fan-like separatrix surface and a spine. However, for small-scale chromospheric jets, clear evidence of such structures is rather rare, although it has been implied in earlier works that showed an inverted-Y-shaped feature. Here we report high-resolution (0″.16) observations of a small-scale chromospheric jet obtained by the New Solar Telescope (NST) using 10830 Å filtergrams. Bi-directional flows were observed across the separatrix regions in the 10830 Å images, suggesting that the jet was produced due to magnetic reconnection. At the base of the jet, a fan-spine structure was clearly resolved by the NST, including the spine and the fan-like surface, as well as the loops before and after the reconnection. A major part of this fan-spine structure, with the exception of its bright footpoints and part of the base arc, was invisible in the extreme ultraviolet and soft X-ray images (observed by the Atmosphere Imaging Assembly and the X-Ray Telescope, respectively), indicating that the reconnection occurred in the upper chromosphere. Our observations suggest that the evolution of this chromospheric jet is consistent with a two-step reconnection scenario proposed by Török et al.
AB - Jets are ubiquitously present in both quiet and active regions on the Sun. They are widely believed to be driven by magnetic reconnection. A fan-spine structure has been frequently reported in some coronal jets and flares, and has been regarded as a signature of ongoing magnetic reconnection in a topology consisting of a magnetic null connected by a fan-like separatrix surface and a spine. However, for small-scale chromospheric jets, clear evidence of such structures is rather rare, although it has been implied in earlier works that showed an inverted-Y-shaped feature. Here we report high-resolution (0″.16) observations of a small-scale chromospheric jet obtained by the New Solar Telescope (NST) using 10830 Å filtergrams. Bi-directional flows were observed across the separatrix regions in the 10830 Å images, suggesting that the jet was produced due to magnetic reconnection. At the base of the jet, a fan-spine structure was clearly resolved by the NST, including the spine and the fan-like surface, as well as the loops before and after the reconnection. A major part of this fan-spine structure, with the exception of its bright footpoints and part of the base arc, was invisible in the extreme ultraviolet and soft X-ray images (observed by the Atmosphere Imaging Assembly and the X-Ray Telescope, respectively), indicating that the reconnection occurred in the upper chromosphere. Our observations suggest that the evolution of this chromospheric jet is consistent with a two-step reconnection scenario proposed by Török et al.
KW - Sun: activity
KW - Sun: chromosphere
KW - Sun: corona
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U2 - 10.3847/2041-8205/819/1/L3
DO - 10.3847/2041-8205/819/1/L3
M3 - Article
AN - SCOPUS:84960192648
SN - 2041-8205
VL - 819
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L3
ER -