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Fine wave dynamics in umbral flash sources
Sych, R.1,2; Wang M(汪敏)1
Source PublicationASTRONOMY & ASTROPHYSICS
2018-10-17
Volume618Pages:9
DOI10.1051/0004-6361/201732139
Contribution Rank第1完成单位
Indexed BySCI ; EI
KeywordSun: Oscillations Sun: Uv Radiation Sunspots
Abstract

Context. Umbral flashes (UFs) are most common phenomenon of wave processes in sunspots. Studying the relationship between wave time dynamics and the origin of UFs requires further investigation of their fine spatial and height structure. 

Aims. We investigated the association between a short time increase in the variations of 3-min extreme ultraviolet (EUV) emission at footpoints of coronal magnetic loops and the UF emergence in sunspot umbra. The spatial structure of magnetic field lines and their inclination determine the cut-off frequency and visibility of sunspot waves. 

Methods. We applied the pixelized wavelet filtering (PWF) technique to analyse a cube of the images obtained by SDO/AIA at 1600 angstrom, 304 angstrom, and 171 angstrom to study the spatio-temporal oscillation power distribution in individual magnetic loops. Time-distance plots were used to obtain the wave front propagation velocity. 

Results. For the first time, we obtained the 2D images of the fine wave processes in magnetic structures of different spatial scales related to the UFs in sunspot. We revealed two types of the UFs as background and local. The background UFs associated with random increasing of separate parts of wave fronts. These UFs are seen as weak and diffuse details that ride the wave fronts without stable shapes and localization in space. The local UFs sources mainly localize near to the footpoint of magnetic loops, anchored in an umbra, along which the propagation of 3-min waves was observed. The time dynamics of flash evolution shows an increase in 3-min oscillations before the UFs peak value within one low-frequency wave train. It is shown that the maxima of 3-min oscillation trains coincide with the peak intensity of UFs. During the UFs evolution, a fine wave spatial and temporal dynamics in UFs local sources was observed. 

Conclusions. The sunspot 3-min wave dynamics showed a relation between the localization of oscillations power peak at the coronal magnetic loop footpoints and the UFs origin. The spatial structure of the UFs sources, their power, and lifetime are determined by the cut-off frequency

Funding ProjectMinistry of Education and Science of the Russian Federation ; Siberian Branch of the Russian Academy of Sciences[II.16.3.2] ; programme of basic research of the RAS Presidium[28] ; Goszadanie 2018[07-00163-18-00] ; Russian Foundation for Basic Research (RFBR)[14-0291157] ; Russian Foundation for Basic Research (RFBR)[17-52-80064 BRICS-a] ; Chinese Academy of Sciences President's International Fellowship Initiative[2015VMA014]
Funding OrganizationMinistry of Education and Science of the Russian Federation ; Siberian Branch of the Russian Academy of Sciences[II.16.3.2] ; programme of basic research of the RAS Presidium[28] ; Goszadanie 2018[07-00163-18-00] ; Russian Foundation for Basic Research (RFBR)[14-0291157, 17-52-80064 BRICS-a] ; Chinese Academy of Sciences President's International Fellowship Initiative[2015VMA014]
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN1432-0746
URL查看原文
WOS IDWOS:000447509300001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordRunning Penumbral Waves ; Photospheric Oscillations ; Sunspot Oscillations ; Solar Atmosphere ; Gravity-waves ; Chromosphere ; Polarization ; Modes ; Lines
EI Accession Number20184606059328
EI KeywordsWavefronts
EI Classification Number701.2magnetism: Basic Concepts And Phenomena
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/18038
Collection射电天文研究组
Corresponding AuthorSych, R.
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, Yunnan 650011, PR China
2.Institute of Solar-Terrestrial Physics SB RAS, Irkutsk 664033, Russia
Recommended Citation
GB/T 7714
Sych, R.,Wang M. Fine wave dynamics in umbral flash sources[J]. ASTRONOMY & ASTROPHYSICS,2018,618:9.
APA Sych, R.,&Wang M.(2018).Fine wave dynamics in umbral flash sources.ASTRONOMY & ASTROPHYSICS,618,9.
MLA Sych, R.,et al."Fine wave dynamics in umbral flash sources".ASTRONOMY & ASTROPHYSICS 618(2018):9.
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