Variation of Chromospheric Features as a Function of Latitude and Time using Ca-K Spectroheliograms for Solar Cycles 15-23: Implications for Meridional Flow

no code implementations • 9 Feb 2021 • Pooja Devi, Jagdev Singh, Ramesh Chandra, Muthu Priyal, Reetika Joshi

We have analysed the Ca-K images obtained at Kodaikanal Observatory as a function of latitude and time for the period of 1913 - 2004 covering the Solar Cycle 15 to 23.

Solar and Stellar Astrophysics

Observations of a prominence eruption and loop contraction

no code implementations • 19 Jan 2021 • Pooja Devi, Pascal Démoulin, Ramesh Chandra, Reetika Joshi, Brigitte Schmieder, Bhuwan Joshi

Rather, this prominence eruption is compatible with an unstable flux rope where the contraction and expansion of the lateral loop is the consequence of a side vortex developing after the flux rope is launched.

Solar and Stellar Astrophysics