Chaos and Periodicities in Solar Flare Index from Kandilli Observatory during 1976–2014  

作　　者：Soumya Roy Amrita Prasad Koushik Ghosh Subhash Chandra Panja Sankar Narayan Patra 

机构地区：[1] Department of Applied Electronics and Instrumentation Engineering,Haldia Institute of Technology,Haldia,Midnapore(E)-721657,West Bengal,India [2] Department of Mechanical Engineering,Jadavpur University,Kolkata-700032,West Bengal,India [3] Department of Mathematics,University Institute of Technology,The University of Burdwan,Burdwan-713104,West Bengal,India [4] Department of Instrumentation and Electronics Engineering,Jadavpur University,Kolkata 700106,West Bengal,India

出　　处：《Research in Astronomy and Astrophysics》2020年第7期177-186,共10页天文和天体物理学研究（英文版）

基　　金：the support extended by Jadavpur University;West Bengal India. This work is a part of RUSA 2.0 Faculty Major Research Project under Jadavpur University。

摘　　要：The Solar Flare Index is regarded as one of the most important solar indices in the field of solarterrestrial research. It has the maximum effect on Earth of all other solar activity indices and is being considered for describing the short-lived dynamo action inside the Sun. This paper attempts to study the short as well as long-term temporal fluctuations in the chromosphere region of the Sun using the Solar Flare Index. The daily Solar Flare Index for Northern, Southern Hemisphere and Total Disk are considered for a period from January 1976 to December 2014(total 14 245 days) for chaotic as well as periodic analysis.The 0–1 test has been employed to investigate the chaotic behavior associated with the Solar Flare Index.This test revealed that the time series data is non-linear and multi-periodic in nature with deterministic chaotic features. For periodic analysis, the Raleigh Power Spectrum algorithm has been used for identifying the predominant periods within the data along with their confidence score. The well-known fundamental period of 27 days and 11 years along with their harmonics are well affirmed in our investigation with a period of 28 days and 10.77 years. The presence of 14 days and 7 days periods in this investigation states the short-lived action inside the Sun. Our investigation also demonstrates the presence of other mid-range periods including the famous Rieger type period which are very much confirming the results obtained by other authors using various solar activity indicators.

关 键 词：CHAOS method:data analysis Sun:activity Sun:flares Sun:fundamental parameters Sun:rotation 

分 类 号：P182.52[天文地球—天文学]