Browsing by Author "Bibhuti Kumar Jha"

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Long-term Evolution of Magnetic Field Proxies as Deduced from Archival Data

Banerjee, D; Bibhuti Kumar Jha; Mandal, Sudip; Chatterjee, Subhamoy; Hegde, M; KoSO Digitization Team (Cambridge University Press on behalf of International Astronomical Union, 2023)

Regular observations of the solar magnetic field are available only for about the last five cycles. Thus, to understand the origin of the variation of the solar magnetic field, it is essential to reconstruct the magnetic ...
Study of sunspot Penumbra to Umbra area ratio using Kodaikanal white-light digitised data

Bibhuti Kumar Jha; Mandal, Sudip; Banerjee, D (Springer, 2019-06)

We study the long-term behaviour of the sunspot penumbra to umbra area ratio by analysing recently digitised Kodaikanal white-light data (1923 – 2011). We implement an automatic umbra extraction method and compute the ratio ...

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