31 citations · 77 across the 4 of their papers we have counts for
6 papers
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…
A Theoretical Model of the Near Surface Shear Layer of the Sun
Bibhuti Kumar Jha, Arnab Rai Choudhuri
The Sun has a Near-Surface Shear Layer (NSSL), within which the angular velocity decreases rapidly with radius. We provide an explanation of this layer based on the thermal wind ba…
Measurements of Solar Differential Rotation Using the Century Long Kodaikanal Sunspot Data
Bibhuti Kumar Jha, Aditya Priyadarshi, Sudip Mandal +2
The rotational profile of the Sun is considered to be one of the key inputs in a solar dynamo model. Hence, precise and long-term measurements of this quantity is important for our…
Delving into the Historical Ca II K Archive from the Kodaikanal Observatory: the Potential of the Most Recent Digitised Series
Theodosios Chatzistergos, Ilaria Ermolli, Sami K. Solanki +4
Full-disc Ca II K photographic observations of the Sun carry direct information about the evolution of solar-plage regions for more than a century and are therefore a unique datase…
Study of Sunspot Penumbra to Umbra Area Ratio using Kodaikanal White-light Digitized Data
Bibhuti Kumar Jha, Sudip Mandal, Dipankar Banerjee
We study the long-term behaviour of sunspot penumbra to umbra area ratio by analyzing the recently digitized Kodaikanal white-light data (1923-2011). We implement an automatic umbr…
Long-term variation of sunspot penumbra to umbra area ratio: A study using Kodaikanal white-light Digitized Data
Bibhuti Kumar Jha, Sudip Mandal, Dipankar Banerjee
A typical sunspot, as seen in white-light intensity images, has a two part structure: a dark umbra and a lighter penumbra. Such distinction primarily arises due to the different or…