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- W4387476906 abstract "Abstract We have systematically investigated ultraviolet (UV) emission from molecular hydrogen (H2) using the Interface Region Imaging Spectrometer (IRIS), during three X-ray flares of C5.1, C9.7 and X1.0 classes on Oct. 25, 2014. Significant emission from five H2 spectral lines appeared in the flare ribbons, interpreted as photo-excitation (fluorescence) due to the absorption of UV radiation from two Si iv spectral lines. The H2 profiles were broad and consisted of two non-stationary components in red and in the blue wings of the line in addition to the stationary component. The red (blue) wing components showed small red-shifts (blue-shifts) of ∼5–15 km s−1 (∼5–10 km s−1). The nonthermal velocities were found to be ∼5–15 km s−1. The interrelation between intensities of H2 lines and their branching ratios confirmed that H2 emission formed under optically thin plasma conditions. There is a strong spatial and temporal correlation between Si iv and H2 emission, but the H2 emission is more extended and diffuse, further suggesting H2 fluorescence, and - by analogy with flare ‘back-warming’- providing a means to estimate the depth from which the H2 emission originates. We find that this is 1871 ± 157 km and 1207 ± 112 km below the source of the Si iv emission, in two different ribbon locations." @default.
- W4387476906 created "2023-10-11" @default.
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- W4387476906 date "2023-10-10" @default.
- W4387476906 modified "2023-10-16" @default.
- W4387476906 title "Behaviour of molecular hydrogen emission in three solar flares" @default.
- W4387476906 doi "https://doi.org/10.1093/mnras/stad2853" @default.
- W4387476906 hasPublicationYear "2023" @default.
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