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Spectroscopic diagnosis of a B-class flare and an associated filament eruption

Kayshap, Pradeep; Babu, B. Suresh; Tripathi, Sharad C.

The flare ribbon and an associated filament eruption are diagnosed using O IV 1401.16 Å, Si IV 1402.77 Å, and Mg II k 2796.35 Å spectral lines provided by Interface Region Imaging Spectrograph (IRIS). The flare ribbons have downflow (redshifts) in all these lines, and this redshift decreases from the transition region to the chromosphere. While th…