Solar physics meeting at IIA, Bangalore

1.2
Poloidal field in the solar wind
1
0.8
0.6
0.4
0.2
0
−0.2
1640 1650 1660 1670 1680 1690 1700 1710 1720 1730 1740 1750
Year
Sunspot eruption takes place only when the
toroidal field reaches a value of 10 5 G.
(Choudhuri 1998; D’Silva & Choudhuri 1993;
Fan et al. 1993)
During M.M., Babcock Leighton α effect will
not work but Parker’s traditional mean field α
effect will work.
Choudhuri & Karak (2009)