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Differential Rotation of the Solar Chromosphere using multidecadal Ca ii K Spectroheliograms

Published online by Cambridge University Press:  23 December 2024

Dibya Kirti Mishra Open the ORCID record for Dibya Kirti Mishra [Opens in a new window] ,
Srinjana Routh ,
Bibhuti Kumar Jha ,
Subhamoy Chatterjee  and
Dipankar Banerjee
Dibya Kirti Mishra*
Affiliation:
Aryabhatta Research Institute of Observational Sciences, Nainital-263002, Uttarakhand, India Mahatma Jyotiba Phule Rohilkhand University, Bareilly-243006, Uttar Pradesh, India
Srinjana Routh
Affiliation:
Aryabhatta Research Institute of Observational Sciences, Nainital-263002, Uttarakhand, India Mahatma Jyotiba Phule Rohilkhand University, Bareilly-243006, Uttar Pradesh, India
Bibhuti Kumar Jha
Affiliation:
Southwest Research Institute, Boulder, CO 80302, USA
Subhamoy Chatterjee
Affiliation:
Southwest Research Institute, Boulder, CO 80302, USA
Dipankar Banerjee*
Affiliation:
Aryabhatta Research Institute of Observational Sciences, Nainital-263002, Uttarakhand, India Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India Center of Excellence in Space Sciences India, IISER Kolkata, Mohanpur 741246, West Bengal, India
*
email: dibyakirtimishra@aries.res.in
email: dipu@aries.res.in
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Abstract

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The study of the differential rotation in the chromosphere of the Sun is of significant importance as it provides valuable insights into the rotational behaviour of the solar atmosphere at higher altitudes and the coupling mechanism between the various layers of the solar atmosphere. In this work, we employed the image correlation technique, explicitly focusing on plages, intending to estimate the chromospheric differential rotation. For this purpose, we have utilized Ca ii K spectroheliograms (1907 – 2007) from the Kodaikanal Solar Observatory (KoSO), recently calibrated with a better technique to ensure accuracy. Our analysis indicates that plages in the chromosphere exhibit faster rotation and a smaller latitudinal gradient when compared to the rotation rate obtained through sunspot tracking. Furthermore, we investigate the temporal analysis of the chromospheric differential rotation parameters across various solar cycles.

Keywords

Sun: chromosphereSun: plagesSun: solar cycleSun: differential rotation
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 31 - 35
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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