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

Published online by Cambridge University Press:  28 September 2023

Dipankar Banerjee Open the ORCID record for Dipankar Banerjee [Opens in a new window] ,
Bibhuti Kumar Jha Open the ORCID record for Bibhuti Kumar Jha [Opens in a new window] ,
Sudip Mandal ,
Subhamoy Chatterjee ,
Manjunath Hegde  and
KoSO Digitization Team
Dipankar Banerjee
Affiliation:
Arybhatta Research Institute of Observational Sciences, Nainital-263001, India Email: dipu@aries.res.in Indian Institute of Astrophysics, Bangalore-560034, Karnataka
Bibhuti Kumar Jha
Affiliation:
Arybhatta Research Institute of Observational Sciences, Nainital-263001, India Email: dipu@aries.res.in Indian Institute of Astrophysics, Bangalore-560034, Karnataka
Sudip Mandal
Affiliation:
Indian Institute of Astrophysics, Bangalore-560034, Karnataka
Subhamoy Chatterjee
Affiliation:
Max Planck Institute for Solar System Research, Göttingen, Germany
Manjunath Hegde
Affiliation:
Arybhatta Research Institute of Observational Sciences, Nainital-263001, India Email: dipu@aries.res.in
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Abstract

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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 field for the past cycles, utilizing the proxies of the magnetic field from other data sets. Long-term uniform observations for the past 100 yrs, as recorded at the Kodaikanal Solar Observatory (KoSO), in multi-wavelengths provide such an opportunity. Various automatic techniques have been developed to extract these features from KoSO data. We analyzed the properties of these extracted features to understand global solar magnetism in the past.

Keywords

Sun: magnetic fieldsSun: photosphereSun: chromosphere, catalogs
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S372: The Era of Multi-Messenger Solar Physics , August 2022 , pp. 84 - 85
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

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