Actions for Three-Dimensional Structure and Evolution of Extreme-Ultraviolet Bright Points Observed by STEREO

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Three-Dimensional Structure and Evolution of Extreme-Ultraviolet Bright Points Observed by STEREO/SECCHI/EUVI

Author
Chae, Jongchul
Published
October 2012.
Physical Description
1 electronic document
Additional Creators
Jones, Shaela I., Poomvises, Watanachak, Moon, Yong-Jae, Davila, Joseph M., Kwon, Ryun Young, and Zhang, Jie
Online Version

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Summary
We unveil the three-dimensional structure of quiet-Sun EUV bright points and their temporal evolution by applying a triangulation method to time series of images taken by SECCHI/EUVI on board the STEREO twin spacecraft. For this study we examine the heights and lengths as the components of the three-dimensional structure of EUV bright points and their temporal evolutions. Among them we present three bright points which show three distinct changes in the height and length: decreasing, increasing, and steady. We show that the three distinct changes are consistent with the motions (converging, diverging, and shearing, respectively) of their photospheric magnetic flux concentrations. Both growth and shrinkage of the magnetic fluxes occur during their lifetimes and they are dominant in the initial and later phases, respectively. They are all multi-temperature loop systems which have hot loops (approx. 10(exp 6.2) K) overlying cooler ones (approx 10(exp 6.0) K) with cool legs (approx 10(exp 4.9) K) during their whole evolutionary histories. Our results imply that the multi-thermal loop system is a general character of EUV bright points. We conclude that EUV bright points are flaring loops formed by magnetic reconnection and their geometry may represent the reconnected magnetic field lines rather than the separator field lines.
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Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20140006632.
GSFC-E-DAA-TN9518.
The Astrophysical Journal; Volume 757; No. 2; 167.
Terms of Use and Reproduction
Copyright, Distribution as joint owner in the copyright.
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