| Name: | Ravindra B |
| Affiliation: | Indian Institute of Astrophysics |
| Conference ID : | ASI2024_446 |
| Title : | Ca-K plage sizes and their asymmetric properties: Analysis Using Kodaikanal Digitized Data |
| Authors : | 1B. Ravindra1
2 Partha Chowdhury
|
| Authors Affiliation: | 1 Indian Insititute of Astrophysics, Koramangala, Bangalore 560034, INDIA
2 University College of Science and Technology, Department of Chemical Technology, University of Calcutta, 92, A.P.C. Road, Kolkata, 700009, West Bengal, India |
| Mode of Presentation: | Poster |
| Abstract Category : | Sun, Solar System, Exoplanets, and Astrobiology |
| Abstract : | Plages are the chromospheric features that appear as bright patches on the solar disk when observed through Ca II K line (3933.67 Å) images. Here, we have used the Ca-K plage area time series obtained from the digitized Kodaikanal Solar Observatory Ca II K data for the period between 1907 and 1985, which covers from cycle 14 (descending phase only) to cycle 21( maximum phase). Then, we divided the plage data series into three different sizes: 0.5 to 2 (small-size), >2 to 4 (medium-size), and > 4 to 11 arcmin^2 (large-size). We have determined the cycle-wise hemispheric asymmetry of different classes of plages as well as their periodic behavior. We explored the periodic behavior of asymmetry data using the wavelet technique, including Rieger-type and quasi-biennial oscillations on different time scales present in the time series. These results may help us better understand the nature and variation of magnetic structures in different layers of the solar atmosphere. |
