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Differential Emission Measure Plasma Diagnostics of a Long-Lived Coronal Hole
Saqri, Jonas1,2; Veronig, Astrid M.1,2; Heinemann, Stephan G.1,2; Hofmeister, Stefan J.1,2; Temmer, Manuela1,2; Dissauer, Karin1,2; Su, Yang3
2020-01-10
Source PublicationSOLAR PHYSICS
ISSN0038-0938
Volume295Issue:1Pages:19
Corresponding AuthorVeronig, Astrid M.(astrid.veronig@uni-graz.at)
AbstractWe use Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) data to reconstruct the plasma properties from differential emission measure (DEM) analysis for a previously studied long-lived, low-latitude coronal hole (CH) over its lifetime of ten solar rotations. We initially obtain a non-isothermal DEM distribution with a dominant component centered around 0.9 MK and a secondary smaller component at 1.5 - 2.0 MK. We find that deconvolving the data with the instrument point spread function (PSF) to account for long-range scattered light reduces the secondary hot component. Using the 2012 Venus transit and a 2013 lunar eclipse to test the efficiency of this deconvolution, significant amounts of residual stray light are found for the occulted areas. Accounting for this stray light in the error budget of the different AIA filters further reduces the secondary hot emission, yielding CH DEM distributions that are close to isothermal with the main contribution centered around 0.9 MK. Based on these DEMs, we analyze the evolution of the emission measure (EM), density, and averaged temperature during the CH's lifetime. We find that once the CH is clearly observed in EUV images, the bulk of the CH plasma reveals a quite constant state, i.e. temperature and density reveal no major changes, whereas the total CH area and the photospheric magnetic fine structure inside the CH show a distinct evolutionary pattern. These findings suggest that CH plasma properties are mostly "set" at the CH formation or/and that all CHs have similar plasma properties.
KeywordCorona Coronal holes
DOI10.1007/s11207-019-1570-z
WOS KeywordSOLAR UPPER-ATMOSPHERE ; THERMAL STRUCTURE ; ORIGIN
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000511946400001
PublisherSPRINGER
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/36468
Collection中国科学院紫金山天文台
Corresponding AuthorVeronig, Astrid M.
Affiliation1.Karl Franzens Univ Graz, Inst Phys, Graz, Austria
2.Karl Franzens Univ Graz, Kanzelhohe Observ, Graz, Austria
3.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China
Recommended Citation
GB/T 7714
Saqri, Jonas,Veronig, Astrid M.,Heinemann, Stephan G.,et al. Differential Emission Measure Plasma Diagnostics of a Long-Lived Coronal Hole[J]. SOLAR PHYSICS,2020,295(1):19.
APA Saqri, Jonas.,Veronig, Astrid M..,Heinemann, Stephan G..,Hofmeister, Stefan J..,Temmer, Manuela.,...&Su, Yang.(2020).Differential Emission Measure Plasma Diagnostics of a Long-Lived Coronal Hole.SOLAR PHYSICS,295(1),19.
MLA Saqri, Jonas,et al."Differential Emission Measure Plasma Diagnostics of a Long-Lived Coronal Hole".SOLAR PHYSICS 295.1(2020):19.
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