The strength of the stratospheric wave driving during northern winter is often quantified by the January–February mean poleward eddy heat flux at 100 hPa. averaged over 40°–80° N (or a similar area and period). Despite the dynamical and chemical relevance of the wave driving. the causes for its variability are still not well understood. https://missouriquiltcoes.shop/product-category/embroidery-fabrics/