43 citations · 113 across the 13 of their papers we have counts for
13 papers
Evolution of Photospheric Magnetic Field and Electric Currents during the X1.6 Flare in Active Region NOAA 12192
Partha Chowdhury, Belur Ravindra, Sanjiv Kumar Tiwari
The dynamics of magnetic fields in the Sun's active regions plays a key role in triggering solar eruptions. Studies have shown that changes in the photosphere's magnetic field can…
Study of Wind pattern at the incursion site of Pangong Tso near Merak Village
Belur Ravindra, Deepangkar Sarkar, Shantikumar Singh Ningombam +5
This study analyzes twelve years of wind speed and direction data collected at the proposed National Large Solar Telescope (NLST) site near Pangong Tso, Merak village, Leh-Ladakh.…
Visible Emission Line Coronagraph (VELC) onboard ADITYA-L1
Jagdev Singh, R. Ramesh, B. Raghavendra Prasad +21
Aditya-L1, India's first dedicated mission to study the Sun and its atmosphere from the Sun-Earth Lagrangian L1 location was successfully launched on 2023 September 2. It carries s…
Equator to Pole Solar Chromospheric Differential Rotation using Ca-K Features Derived from Kodaikanal Data
Hema Kharayat, Jagdev Singh, Muthu Priyal +1
Differential rotation is one of the basic characteristics of the Sun, and it plays an important role in generating the magnetic fields and its activities. We investigated rotation…
Data processing of Visible Emission Line Coronagraph Onboard ADITYA L1
Muthu Priyal, Jagdev Singh, B. Raghavendra Prasad +28
ADITYA-L1 is India's first dedicated mission to observe the sun and its atmosphere from a halo orbit around L1 point. Visible emission line coronagraph (VELC) is the prime payload…
Temporal and latitudinal variations of Ca-K plage and network area: An implication to meridional flows
Muthu Priyal, Jagdev Singh, Belur Ravindra +1
The Ca-K spectroheliograms obtained at the Kodaikanal observatory (KO) are used to generate a uniform time series using the equal contrast technique (ECT) to study the long and sho…
Temporal evolutions and quasi-periodic variations present in the sunspot number and group sunspot area data measured at Kodaikanal Observatory for solar cycles 14 to 24
Belur Ravindra, Partha Chowdhury, Pratap Chandra Ray +1
The Kodaikanal Observatory has made synoptic observations of the Sun in white light since 1904, and these images are sketched on the Stonyhurst grids called sun charts. These conti…
Extending the Sunspot Area Series from Kodaikanal Solar Observatory
Bibhuti Kumar Jha, Manjunath Hegde, Aditya Priyadarshi +3
Kodaikanal Solar Observatory (KoSO) possesses one of world's longest and homogeneous records of sunspot observations that span more than a century (1904-2017). Interestingly, these…
Full-disk Synoptic Observations of the Chromosphere Using H Telescope at the Kodaikanal Observatory
B. Ravindra, K. Prabhu, K. E. Rangarajan +7
This paper reports on the installation and observations of a new solar telescope installed on 7th October, 2014 at the Kodaikanal Observatory. The telescope is a refractive type eq…
Butterfly Diagram and Carrington Maps for Century-Long Ca II K Spectroheliograms from Kodaikanal Observatory
Subhamoy Chatterjee, Dipankar Banerjee, B. Ravindra
The century-long (1907-2007) Ca II K spectroheliograms from Kodaikanal Solar Observatory (KSO) are calibrated, processed and analysed in the present study to follow the evolution o…
Fabry-Pérot based Narrow Band Imager for Solar Filament Observations
Sajal Kumar Dhara, B. Ravindra, Ravinder Kumar Banyal
We have recently developed a narrow band imager (NBI) using an air gap based Fabry-Pérot (FP) interferometer at the Indian Institute of Astrophysics, Bangalore. Narrow band imaging…
Separable solutions of force-free spheres and applications to solar active regions
A. Prasad, A. Mangalam, B. Ravindra
In this paper, we present a systematic study of the force-free field equation for simple axisymmetric configurations in spherical geometry and apply it to the solar active regions.…
On the line profile changes observed during the X2.2 class flare in the active region NOAA 11158
A. Raja Bayanna, Brajesh Kumar, P. Venkatakrishnan +4
The solar active region NOAA 11158 produced a series of flares during its passage through the solar disk. The first major flare (of class X2.2) of the current solar cycle occurred…