Chowdhury, Partha; Ravindra, B; Bertello, Luca; Pevtsov, Alexei A
(IOP Publishing, 2022-01-20)
The Kodaikanal Observatory has provided long-term synoptic observations of chromospheric activities in the Ca ii K line (393.34 nm) since 1907. This article investigates temporal and periodic variations of the hemispheric ...