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MULTI-WAVELENGTH OBSERVATIONS OF A SUBARCSECOND PENUMBRAL TRANSIENT BRIGHTENING EVENT
Bai, X. Y.; Su, J. T.; Cao, W. D.; Liu, S. Q.; Deng, Y. Y.; Priya, T. G.; Bai, XY (reprint author), Chinese Acad Sci, Space Environm Predict Ctr, Natl Space Sci Ctr, 1 Nanertiao, Beijing 100190, Peoples R China.; Bai, XY (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, 20 Datun Rd, Beijing 100012, Peoples R China.
Department空间环境部
Source PublicationASTROPHYSICAL JOURNAL
2016
Volume823Issue:1Pages:60
ISSN0004-637X
Language英语
KeywordMethods: Observational Sun: Chromosphere Sun: Corona Sun: Magnetic Fields Sun: Transition Region
AbstractWe report a subarcsecond penumbral transient brightening event with the high-spatial resolution observations from the 1.6 m New Solar Telescope (NST), Interface Region Imaging Spectrograph (IRIS), and the Solar Dynamics Observatory. The transient brightening, whose thermal energy is in the range of nanoflares, has signatures in the chromosphere, the transient region, and the corona. NST's H alpha channel reveals the fine structure of the event with a width as narrow as 101 km (0 ''.14), which is much smaller than the width from the previous observation. The transient brightening lasts for about 3 minutes. It is associated with a redshift of about 17 km s(-1), found in the Si IV 1402.77 angstrom line and exhibits an inward motion to the umbra with a speed of 87 km s(-1). The small-scale energy released from the event has a multi-temperature component. Spectral analysis of the brightening region from IRIS shows that not only the transition region lines such as Si IV 1402.77 and C II 1334.53 angstrom, but also the chromospheric Mg II k 2796.35 angstrom line are significantly enhanced and broadened. In addition, the event can be found in all the extreme-ultraviolet passbands of the Atmospheric Imaging Assembly and the derived differential emission measure profile increases between 4 and 15 MK (or 6.6 <= log T <= 7.2) in the transient brightening phase. It is possible that the penumbral transient brightening event is caused by magnetic reconnection.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5676
Collection空间环境部
Corresponding AuthorBai, XY (reprint author), Chinese Acad Sci, Space Environm Predict Ctr, Natl Space Sci Ctr, 1 Nanertiao, Beijing 100190, Peoples R China.; Bai, XY (reprint author), Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, 20 Datun Rd, Beijing 100012, Peoples R China.
Recommended Citation
GB/T 7714
Bai, X. Y.,Su, J. T.,Cao, W. D.,et al. MULTI-WAVELENGTH OBSERVATIONS OF A SUBARCSECOND PENUMBRAL TRANSIENT BRIGHTENING EVENT[J]. ASTROPHYSICAL JOURNAL,2016,823(1):60.
APA Bai, X. Y..,Su, J. T..,Cao, W. D..,Liu, S. Q..,Deng, Y. Y..,...&Bai, XY .(2016).MULTI-WAVELENGTH OBSERVATIONS OF A SUBARCSECOND PENUMBRAL TRANSIENT BRIGHTENING EVENT.ASTROPHYSICAL JOURNAL,823(1),60.
MLA Bai, X. Y.,et al."MULTI-WAVELENGTH OBSERVATIONS OF A SUBARCSECOND PENUMBRAL TRANSIENT BRIGHTENING EVENT".ASTROPHYSICAL JOURNAL 823.1(2016):60.
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