Signatures of the non-Maxwellian kappa-distributions in optically thin line spectra II. Synthetic Fe XVII-XVIII X-ray coronal spectra and predictions for the Marshall Grazing-Incidence X-ray Spectrometer (MaGIXS)

0511040 - ASÚ 2020 RIV FR eng J - Journal Article
Dudík, Jaroslav - Dzifčáková, Elena - Del Zanna, G. - Mason, H. E. - Golub, L. - Winebarger, A. - Savage, S.
Signatures of the non-Maxwellian kappa-distributions in optically thin line spectra II. Synthetic Fe XVII-XVIII X-ray coronal spectra and predictions for the Marshall Grazing-Incidence X-ray Spectrometer (MaGIXS).
Astronomy & Astrophysics. Roč. 626, June (2019), č. článku A88. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR(CZ) GA17-16447S; GA ČR(CZ) GA18-09072S
Institutional support: RVO:67985815
Keywords : Sun * UV radiation * X-rays
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.636, year: 2019
Method of publishing: Limited access
https://doi.org/10.1051/0004-6361/201935285

We investigated the possibility of diagnosing the degree of departure from the Maxwellian distribution using the Fe XVII-Fe XVIII spectra originating in plasmas in collisional ionization equilibrium, such as in the cores of solar active regions or microflares. We find that many line intensity ratios are sensitive to both T and kappa. Best diagnostic options are provided if a ratio involving both Fe XVII and Fe XVIII is combined with another ratio involving lines formed within a single ion. The sensitivity of such diagnostics to kappa is typically a few tens of per cent. Much larger sensitivity, of about a factor of two to three, can be obtained if the Fe XVIII 93.93 angstrom line observed by SDO/AIA is used in conjuction with the X-ray lines.
Permanent Link: http://hdl.handle.net/11104/0301392