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Browsing by Author "Chowdhury, Partha"

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Analysis of Solar Hemispheric Chromosphere Properties using the Kodaikanal Observatory Ca–K Index

Chowdhury, Partha; Ravindra, B; Bertello, Luca; Pevtsov, Alexei A (IOP Publishing, 2022-01-20)

The Kodaikanal Observatory has provided long-term synoptic observations of chromospheric activities in the Ca ii K line (393.34 nm) since 1907. This article investigates temporal and periodic variations of the hemispheric ...
Mid-term periodicities in solar radio emission corresponding to sunspot number during solar cycle 23

Aroori, Mahender; Vemareddy, P; Chowdhury, Partha; Yellaiah, G (Springer, 2021-03)

We present a systematic time-series analysis of solar radio emission in nine different frequencies to compare with that of daily sunspot number (SSN) during Solar Cycle 23 (1996-2009). Owing to the contribution from quiet-sun ...
Solar-Cycle Characteristics in Kodaikanal Sunspot Area: North-South Asymmetry, Phase Distribution and Gnevyshev Gap

Ravindra, B; Chowdhury, Partha; Javaraiah, J (Springer Nature, 2021-01)

Solar activity is asymmetric in the two hemispheres in almost all cycles. This asymmetry is observed both in cycle amplitude and period. We have used about 90 years of sunspot-area data from the Kodaikanal Solar Observatory ...
Temporal Evolutions and Quasiperiodic Variations Present in the Sunspot Number and Group Sunspot Area Data Measured at Kodaikanal Observatory for Solar Cycles 14-24

Ravindra, B; Chowdhury, Partha; Ray, Pratap Chandra; Pichamani, Kumaravel (American Astronomical Society, 2022-11-20)

The Kodaikanal Observatory has made synoptic observations of the Sun in white light since 1904, and these images are sketched on the Stonyhurst grids called Sun charts. These continuous hand-drawn data sets are used for ...

Browsing by Author "Chowdhury, Partha"

Browsing by Author "Chowdhury, Partha"

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