  This study presents the continuation of the analysis of variations of
atmospheric and space weather parameters above Iberian Peninsula along two
years near the 24th solar cycle maximum presented in Morozova et al. [2016].
Previously, the first mode of the principal component analysis was shown to
correlate with the lower stratospheric ozone and anti-correlate with cosmic ray
flux. In this paper we discuss the second mode that, to our mind, suggests a
coupling between the stratosphere and ionosphere. This second mode, located in
the low and middle stratosphere and explaining 6-15\% of temperature and 2.5\%
of geopotential height variations, positively correlates with the
middle-stratospheric ozone content. Among locally measured space weather
parameters, this atmospheric mode negatively correlates with the ionospheric
total electron content. The stratospheric-ionospheric coupling was analyzed
using the correlation and wavelet analyses. Found similarities between
variations of the stratospheric and ionospheric parameters were tested with a
method allowing estimation of the causal nature of the found relationships, the
convergent cross mapping (CCM). Strong evidences for the
stratospheric-ionospheric coupling were obtained for the winter 2012-2013 that
is characterized by the east QBO phase and a strong sudden stratospheric
warming event.
