Determination of Differential Emission Measure from Solar Extreme Ultraviolet Images
Su, Yang1,2; Veronig, Astrid M.3; Hannah, Iain G.4; Cheung, Mark C. M.5; Dennis, Brian R.6; Holman, Gordon D.6; Gan, Weiqun1,2; Li, Youping1,2

The Atmospheric Imaging Assembly (AIA) on board the Solar Dynamic Observatory (SDO) has been providing high-cadence, high-resolution, full-disk UV-visible/extreme ultraviolet (EUV) images since 2010, with the best time coverage among all the solar missions. A number of codes have been developed to extract plasma differential emission measures (DEMs) from AIA images. Although widely used, they cannot effectively constrain the DEM at flaring temperatures with AIA data alone. This often results in much higher X-ray fluxes than observed. One way to solve the problem is by adding more constraint from other data sets (such as soft X-ray images and fluxes). However, the spatial information of plasma DEMs are lost in many cases. In this Letter, we present a different approach to constrain the DEMs. We tested the sparse inversion code and show that the default settings reproduce X-ray fluxes that could be too high. Based on the tests with both simulated and observed AIA data, we provided recommended settings of basis functions and tolerances. The new DEM solutions derived from AIA images alone are much more consistent with (thermal) X-ray observations, and provide valuable information by mapping the thermal plasma from similar to 0.3 to similar to 30 MK. Such improvement is a key step in understanding the nature of individual X-ray sources, and particularly important for studies of flare initiation.

Keywordmagnetic reconnection - methods data analysis - Sun corona - Sun flares - Sun UV radiation - Sun X-rays gamma rays
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000428392300008
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Document Type期刊论文
Corresponding AuthorSu, Yang
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Karl Franzens Univ Graz, Inst Phys, Kanzelhohe Observ IGAM, Univ Pl 5-2, A-8010 Graz, Austria
4.Univ Glasgow, SUPA Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
5.Lockheed Martin Solar & Astrophys Lab, 3251 Hanover St, Palo Alto, CA 94304 USA
6.NASA, Solar Phys Lab Code 671, Heliophys Sci Div, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Recommended Citation
GB/T 7714
Su, Yang,Veronig, Astrid M.,Hannah, Iain G.,et al. Determination of Differential Emission Measure from Solar Extreme Ultraviolet Images[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,856(1):10.
APA Su, Yang.,Veronig, Astrid M..,Hannah, Iain G..,Cheung, Mark C. M..,Dennis, Brian R..,...&Li, Youping.(2018).Determination of Differential Emission Measure from Solar Extreme Ultraviolet Images.ASTROPHYSICAL JOURNAL LETTERS,856(1),10.
MLA Su, Yang,et al."Determination of Differential Emission Measure from Solar Extreme Ultraviolet Images".ASTROPHYSICAL JOURNAL LETTERS 856.1(2018):10.
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