TY - JOUR
T1 - HIGH-RESOLUTION OBSERVATIONS of A LARGE FAN-SHAPED SURGE
AU - Li, Zhen
AU - Fang, Cheng
AU - Guo, Yang
AU - Chen, P. F.
AU - Zou, Peng
AU - Cao, Wenda
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (NSFC) under the grant Nos. 10878002, 11025314, 10673004, 10610099a, and 11533005, as well as NKBRSF under the grants 2011CB811402 and 2014CB744203. W.C. acknowledges the support of the US NSF (AGS-0847126 and AGS-1250818) and NASA (NNX13AG14G).
Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - We present high-resolution observations of a large fan-shaped surge, which was observed on 2013 June 5 with the current largest solar telescope, the 1.6 m New Solar Telescope (NST), at the Big Bear Solar Observatory. The observations are made at TiO, Hα, and 10830 - wavebands with a spatial resolution better than and a full-run cadence of ∼30 s. The fan-shaped surge consists of many small-scale threads with a typical width of 100 km and a length of up to 200 Mm at the maximum. The threads come from material ejections, which start with a velocity of several km s-1, and then accelerate up to 60-80 km s-1 over six to seven minutes with an acceleration of up to 0.2-0.3 km s-2. The threads can be observed in the Hα band and in SDO/AIA 171 - images as absorbed objects, implying that they are cool material ejections. The surge is ejected along open magnetic field lines in the extrapolated non-linear force-free field, which might actually be a part of a large-scale magnetic loop stretching back to the solar surface. After 10-20 minutes, the ejections gradually decay and the surge eventually vanishes. The total lifetime is about 35 minutes. The Hα brightening at the root of the fan-shaped surge implies that there is heating in the chromosphere, which could be produced by low-atmosphere interchange magnetic reconnection. Our observation provides evidence of the reconnection model for the fan-shaped surges, which was proposed by Jiang et al.
AB - We present high-resolution observations of a large fan-shaped surge, which was observed on 2013 June 5 with the current largest solar telescope, the 1.6 m New Solar Telescope (NST), at the Big Bear Solar Observatory. The observations are made at TiO, Hα, and 10830 - wavebands with a spatial resolution better than and a full-run cadence of ∼30 s. The fan-shaped surge consists of many small-scale threads with a typical width of 100 km and a length of up to 200 Mm at the maximum. The threads come from material ejections, which start with a velocity of several km s-1, and then accelerate up to 60-80 km s-1 over six to seven minutes with an acceleration of up to 0.2-0.3 km s-2. The threads can be observed in the Hα band and in SDO/AIA 171 - images as absorbed objects, implying that they are cool material ejections. The surge is ejected along open magnetic field lines in the extrapolated non-linear force-free field, which might actually be a part of a large-scale magnetic loop stretching back to the solar surface. After 10-20 minutes, the ejections gradually decay and the surge eventually vanishes. The total lifetime is about 35 minutes. The Hα brightening at the root of the fan-shaped surge implies that there is heating in the chromosphere, which could be produced by low-atmosphere interchange magnetic reconnection. Our observation provides evidence of the reconnection model for the fan-shaped surges, which was proposed by Jiang et al.
KW - Sun: activity
KW - Sun: chromosphere
KW - instrumentation: high angular resolution
KW - magnetic reconnection
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U2 - 10.3847/0004-637X/826/2/217
DO - 10.3847/0004-637X/826/2/217
M3 - Article
AN - SCOPUS:84982224382
SN - 0004-637X
VL - 826
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 217
ER -