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Machine Learning Based Identification of Solar Disk and Plages in Kodaikanal Solar Observatory Historical Suncharts
Dibya Kirti Mishra, Subhamoy Chatterjee, Bibhuti Kumar Jha +6
Kodaikanal Solar Observatory (KoSO) is one of the oldest solar observatories, possessing an archive of multi-wavelength solar observations, including white light, Ca II K, and H-al…
Detection of Solar Filaments using Suncharts from Kodaikanal Solar Observatory Archive Employing a Clustering Approach
Aditya Priyadarshi, Manjunath Hegde, Bibhuti Kumar Jha +4
With over 100 years of solar observations, the Kodaikanal Solar Observatory (KoSO) is a one-of-a-kind solar data repository in the world. Among its many data catalogues, the `sunch…
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…
Rotation rate of high latitude and near polar coronal holes
K. M. Hiremath, Manjunath Hegde, K. R. Varsha
For the period of 1997-2006, coronal holes detected in the SOHO/EIT 195 full disk calibrated images are used to compute the rotation rates of high latitude and near polar coron…
Thermal and magnetic field structure of near equatorial coronal holes
K. M. Hiremath, Manjunath Hegde
We use full-disk, SOHO/EIT 195 calibrated images to measure latitudinal and day to day variations of area and average photon fluxes of the near equatorial coronal holes. In add…
Analysis of full disc Ca II K spectroheliograms III. Plage area composite series covering 1892-2019
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova +16
We derive the plage area evolution over the last 12 solar cycles employing data from all Ca II K archives available publicly in digital form known to us, including several as yet u…