Updated Reference Wavelengths for Si vii and Mg vii Lines in the 272–281 Å Range

Peter R. Young*

*Corresponding author for this work

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Abstract

New reference wavelengths for atomic transitions of Mg vii and Si vii in the 272–281 Å wavelength range are derived using measurements from the Extreme-ultraviolet Imaging Spectrometer (EIS) on board the Hinode spacecraft. Mg vii and Si vii are important ions for measuring plasma properties in the solar transition region at around 0.6 MK. The six Si vii wavelengths are 13–21 mÅ and 7–11 mÅ longer than the values in the NIST Atomic Spectra Database (ASD) and the compilations of B. Edlén, respectively. The four Mg vii wavelengths are shorter than the values in the ASD by 8–12 mÅ but show reasonable agreement with the Edlén values. The new wavelengths will lead to more accurate Doppler shift measurements from the EIS instrument and will be valuable for spectral disambiguation modeling for the upcoming Multi-Slit Solar Explorer mission.
Original languageEnglish
Article number40
Pages (from-to)1-6
Number of pages6
JournalThe Astrophysical Journal
Volume958
Issue number1
DOIs
Publication statusPublished - 1 Nov 2023
Externally publishedYes

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