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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…
Solar orbiter: a short review of the mission and early science results
Müller, Daniel; Harra, Louise
On 9 February 2020 at 11:03 pm EST, an Atlas V 411 rocket launched the ESA/ NASA Solar Orbiter mission. This mission was the culmination of decades of work across many countries to achieve the goal of getting close to the Sun and measuring how the Sun creates and maintains the heliosphere. The mission's goal is to understand how the inner heliosph…
A study on the evolutionary period changes of short-period type II cepheids
Pastukhova, Elena N.; Yacob, Alemiye Mamo; Berdinkov, Leonid N.
We investigate the period changes of 13 short-period Type II Cepheids using the O-C method over a century-long data baseline. The O-C diagrams for these stars exhibit a parabolic trend, indicating both increasing and decreasing period changes over time. These observed period changes are consistent with recent theoretical models based on horizontal…