Fig. 2

Time series of the (a) SC index (F10.7Â cm flux), (b) multivariate ENSO index (MEI), and (c) QBO indices on a monthly basis from February 1979 to January 2018
Time series of the (a) SC index (F10.7Â cm flux), (b) multivariate ENSO index (MEI), and (c) QBO indices on a monthly basis from February 1979 to January 2018