Extending the sunspot area series from Kodaikanal Solar Observatory
sunspots
sunspot area
QC801-809
Astronomy
Geophysics. Cosmic physics
Sun
FOS: Physical sciences
Astronomy and Astrophysics
QB1-991
01 natural sciences
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
solar cycle
0103 physical sciences
Kodaikanal Solar Observatory
white-light
Solar and Stellar Astrophysics (astro-ph.SR)
DOI:
10.3389/fspas.2022.1019751
Publication Date:
2022-10-25T07:25:45Z
AUTHORS (6)
ABSTRACT
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 observations (originally recorded in photographic plates/films) were taken with the same setup over this entire time period which makes this data unique and best suitable for long-term solar variability studies. A large part of this data, between 1921–2011, were digitized earlier and a catalog containing the detected sunspot parameters (e.g., area and location) was published in Mandal et al. (2017). In this article, we extend the earlier catalog by including new sets of data between 1904–1921 and 2011–2017. To this end, we digitize and calibrate these new datasets which include resolving the issue of random image orientation. We fix this by comparing the KoSO images with co-temporal data from Royal Greenwich Observatory. Following that, a semi-automated sunspot detection and automated umbra detection algorithm are implemented onto these calibrated images to detect sunspots and umbra. Additionally, during this catalog updation, we also filled data gaps in the existing KoSO sunspot catalog (1921–2011) by virtue of re-calibrating the “rouge” plates. This updated sunspot area series covering nearly 115 years (1904–2017) are being made available to the community and will be a unique source to study the long term variability of the Sun.
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