Jñānābha‎, Vol. 49 (2) (2019), 64-81

STATISTICAL ANALYSIS OF THE ASYMMETRIC BEHAVIOR OF DIFFERENT SOLAR ACTIVITY FEATURES DURING SOLAR CYCLES 20-24

By

Bimal Pande1, Deepa Bisht2, Mahesh C. Joshi3, Seema Pande4 and Ramesh Chandra5

1;4;5Department of Physics and 2;3Department of Mathematics DSB Campus

Kumaun University, Nainital - 263001, Uttrakhand, India

Email: pandebimal@yahoo.co.in, bishtdeepa812@gmail.com, mcjoshi69@gmail.com, pande.seema@yahoo.com and rchandra.ntl@gmail.com

(Received : October 16, 2019 ; Revised: November 11, 2019)



Abstract

The study of North-South (N-S) asymmetry phenomenon is quite important because of its applicability in understanding the nature of solar dynamo action. The aim of our present work is to study and analyze various solar active phenomena occurring in both north and south hemispheres of the sun during solar cycles 20-24(up to December 2011). The data of X-ray solar flares from 1975 to 2011 and of Hα Flares, Sunspot Area and Solar Active Prominences (SAP) from 1964 to 2011 are first normalized and then analyzed statistically. The N-S asymmetry indices and correlation for several solar phenomena have been calculated and plotted. Our study shows that most of the activity features in solar cycles 20-23 starts from northern hemisphere and afterward dominated in the southern hemisphere but in the rise phase of the solar cycle 24, activity features start in the southern hemisphere and afterward dominated in the northern hemisphere. The study indicates that some of the solar activity features like Sunspot Area and Hα Flares are highly correlated with one another where as in the northern hemisphere Sunspot Area and north dominated Soft X-rays are poorly correlated.


2010 Mathematics Subject Classification03H10, 85A99
Keywords and phrasesNorth-South asymmetry, X-ray solar fares, Hα fares, Sunspot Area and Solar Active Prominences (SAP)