Abstract Details

Name: Soumya Roy
Affiliation: Haldia Institute of Technology, Haldia
Conference ID: ASI2020_472
Title : Periodic Behaviour of 10.7 cm Solar Radio Flux during Solar Cycle 20 – 24 using Empirical Mode Decomposition
Authors and Co-Authors : Soumya Roy, Amrita Prasad, Koushik Ghosh, Subhash Chandra Panja, Sankar Narayan Patra
Abstract Type : Poster
Abstract Category : Sun and the Solar System
Abstract : Aim: The data of 10.7 cm Solar Radio Flux during solar cycle 20 to 24 (up to 31st December 2014) is undergone for periodicity analysis. Method: Periodicity analysis has been performed using Empirical Mode Decomposition. Result: Various significant intermediate periodicities are observed in daily 10.7 cm Solar Radio Flux data. The most significant periods are as follows: (i) the periods of ~22.4 years and ~10.94 years are well associated with ~22 years Hale cycle and ~11 years Solar cycle respectively which implies polarity interchange of the magnetic field of the Sun. (ii) Another period of ~27 days is due to the existence of synodic rotational modulation. (iii) the period of ~14 days is not only the sub-harmonic of ~27 day period but also due to the presence of 180° apart solar active longitudes. And the smallest period of ~7 day is nothing but the second harmonic of ~14 day period primarily due to the presence of short-lived regions inside the Sun. (iv) the concept of ‘Rieger Periodicity’ is well affirmed by this data with a period of ~156 days. Also, periods around ~44 days and ~89 days are due to the magnetic Rossby Wave which may be the possible source of ‘Rieger Periodicity’. (v) a period around ~1.1 years may be considered as an indication for understanding the behavior of magnetic field emergence and a magnetic cycle of the Sun. (vi) another mid-range periodicity like ~320 days and ~3.0 years are due to annual variation oscillation and quasi triennial periodicity of the Sun respectively. The result indicates that the 10.7 cm Solar Radio Flux together with the other solar activities are originated from the same location and the 10.7 cm Solar Radio Flux has a unique signature on the forecasting of space weather.