Notes on the correlation between sudden stratospheric warmings and solar activity

Ekaterina Vorobeva
2019 Annales Geophysicae  
<p><strong>Abstract.</strong> A correlation between solar activity and normalized occurrence rate of sudden stratospheric warmings (SSWs) has been found. As a proxy for solar activity, the 10.7&amp;thinsp;cm solar radio flux has been used. In order to find the correlation, we derived a normalized occurrence rate of major sudden stratospheric warmings (MSSWs) based on both the ERA-40/ERA-Interim dataset and NCEP data. Based on this distribution, we calculated the correlation coefficient, which
more » ... oefficient, which amounts to 0.63, with a significance of 90.68&amp;thinsp;%, for ERA-40/ERA-Interim, and 0.55 for the NCEP–NCAR-I reanalysis, with a significance of 83.80&amp;thinsp;%. Additionally, we calculate correlation coefficients for Lyman-alpha flux and sunspot numbers with the analogous method for the same period.</p>
doi:10.5194/angeo-37-375-2019 fatcat:nwhmnxvodndodft35jgwdbdzqu