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Solar Activity Changes During Prolonged Sunspot Minima as Inferred from Indian Monsoon Rainfall Variations

Published online by Cambridge University Press:  27 November 2018

S. Ambily ,
V. G. Haritha ,
C. Sunil Kumar Morais  and
T. E. Girish
S. Ambily
Affiliation:
Department of Physics, University College, Trivandrum 695034, India emails: ambilysuresh03@gmail.com, vgharithamanoj@gmail.com, tegirish5@yahoo.co.in
V. G. Haritha
Affiliation:
Department of Physics, University College, Trivandrum 695034, India emails: ambilysuresh03@gmail.com, vgharithamanoj@gmail.com, tegirish5@yahoo.co.in
C. Sunil Kumar Morais
Affiliation:
PhD Research scholar in Physics, M.S. University, Tirunelveli, India email: sunilkumarmoraisc@yahoo.co.in
T. E. Girish
Affiliation:
Department of Physics, University College, Trivandrum 695034, India emails: ambilysuresh03@gmail.com, vgharithamanoj@gmail.com, tegirish5@yahoo.co.in
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Abstract

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We could find a new 5 year periodicity in the occurrences of peaks in sunspot activity and inferred deviations of annual Indian monsoon rainfall variations from the normal during the Maunder minimum (MM) period. This result is explained in terms of solar dynamo functioning in a different mode from normal during the MM where quadrupole field (first harmonic, 5-5.5 years) dominate over dipole field (fundamental, 11 years) causing extreme north south asymmetry in sunspot activity.

Keywords

Maunder minimaIndian monsoon rainfall5.5 year periodicitysolar activitysolar dynamoquadrupole fields

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