Abstract
We report the bi-directional moving structures in a coronal bright point (CBP) on 2015 July 14. It is observed by the Atmospheric Imaging Assembly (AIA) onboard Solar Dynamics Observatory (SDO). This CBP has a lifetime of ∼10 minutes, and a curved shape. The observations show that many bright structures are moving intermittently outward from the CBP brightness core. Such moving structures are clearly seen at AIA 171 Å, 193 Å, 211 Å, 131 Å, 94 Å, 335 Å and 304 Å, slit-jaw (SJI) 1330 Å and 1400 Å. In order to analyze these moving structures, the CBP is cut along the moving direction with a curved slit from the AIA and SJI images. Then we can obtain the time-distance slices, including the intensity and intensity-derivative diagrams, from which, the moving structures are recognized as the oblique streaks, and they are characterized by the bi-direction, simultaneity, symmetry, and periodicity. The average speed is around \(300~\mbox{km}\,\mbox{s}^{-1}\), while the typically period is \(\sim90~\mbox{s}\). All these features (including the bi-directional flows and their periodicity) can be detected simultaneously at all the 9 wavelengths. This CBP takes place at the site between a small pair of magnetic polarities. High time resolution observations show that they are moving close to each other during its lifetime. These facts support the magnetic reconnection model of the CBP and the bi-directional moving structures could be the observational outflows after the reconnection. Therefore, they can be as the direct observation evidence of the magnetic reconnection.
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Acknowledgements
We would like to thank the anonymous referee for his/her valuable comments to improve the manuscript. The data used in this paper are mainly from IRIS and SDO. IRIS is a NASA small explorer mission developed and operated by LMSAL with mission operations executed at NASA Ames Research center and major contributions to downlink communications funded by the Norwegian Space Center (NSC, Norway) through an ESA PRODEX contract. SDO is the first mission to be launched under NASA’s Living With a Star (LWS) program. This study is supported by NSFC under grants 11333009, 11303101, 11473071, 11573072, 973 program (2014CB744200) and Laboratory No. 2010DP173032. This work is also supported by the Youth Fund of Jiangsu No. BK20141043 and BK20161095, and one hundred talent program of Chinese Academy of Sciences.
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Li, D., Ning, Z. & Su, Y. The bi-directional moving structures in a coronal bright point. Astrophys Space Sci 361, 301 (2016). https://doi.org/10.1007/s10509-016-2893-y
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DOI: https://doi.org/10.1007/s10509-016-2893-y