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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…

Self-absorption in solar surge as observed by IRIS

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

Solar surges are collimated flows of plasma that occur in the periphery of active regions (ARs). The kinematics, physical properties, and triggering mechanisms of a solar surge were studied through imaging and spectroscopic diagnosis. The surge has a typical inverted Y-shape, and it moves with a speed of more than 200 km/s in the transition-region…

The bi-directional moving structures in a coronal bright point

Li, Dong; Ning, Zongjun; Su, Yingna

We report the bi-directional moving structures in a coronal bright point (CBP) on 2015 July 14. It is observed by the Atmospheric Imaging Assembly (AIA) onboard Solar Dynamics Observatory (SDO). This CBP has a lifetime of ∼10 minutes, and a curved shape. The observations show that many bright structures are moving intermittently outward from the C…