Sep 21 – 23, 2015
Royal Observatory of Belgium
Europe/Brussels timezone

On long-term behavior of North-South Asymmetry of Solar Phenomena

Sep 21, 2015, 3:00 PM
30m
Meridian Room (Royal Observatory of Belgium)

Meridian Room

Royal Observatory of Belgium

Avenue Circulaire - 3 - Ringlaan 1180 Brussels
Talk 4-Space era data versus historical records

Speaker

Dr VIRENDRA VERMA (UTTRAKHAND SPACE APPLICATION CENTER, DEHRADUN, INDIA)

Description

V. K. VERMA Uttrakhand Space Application Center, Dehradun, India vkvermadr@rediffmail.com

Summary

The long-term behavior of North-South (N-S) asymmetry related to solar activity phenomena are investigated. In the present investigation we have used sunspots area data (1821-2015) and flare index data (1936-2014) for various solar cycles. The statistical technique was used check the validity of asymmetry. Earlier Verma (1992, 1993, and 2009) reported long-term cyclic period 11 solar cycles in N-S asymmetry and also predicted that the N-S asymmetry of solar activity phenomena during solar cycles 21, 22, 23 and 24 will be south dominated and the N-S asymmetry will shift to north hemisphere in solar cycle 25. The present study shows that the N-S asymmetry during solar cycles 22 and 23 were southern dominated as predicted by Verma (1992). The N-S asymmetry index for years 2008-2015 of solar cycle 24th is showing southern domination and confirming prediction/result of Verma (1992). The 11 solar cycle’s periodic behavior of the Sun may be related to internal structure of the Sun. The result of this study may be helpful to understand long-term helioseismic phenomena and dynamo models of the Sun which are based on the magnetic fields related to solar active phenomena.

References

Verma, V. K. 1992, ASPCS, 27, 429.

Verma, V. K. 1993, ApJ, 403, 797.

Verma, V.K. 2009, ASPCS, 416, 483

Primary author

Dr VIRENDRA VERMA (UTTRAKHAND SPACE APPLICATION CENTER, DEHRADUN, INDIA)

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