An artificial feed-forward neural network with one hidden layer and error back-propagation learning is used to predict the geomagnetic activity index (<i>D<sub>st</sub></i>) one hour in advance. The <i>B<sub>z</sub></i>-component and <i>Σ<sub>Bz</sub></i>. the density. and the velocity of the solar wind... https://pipingrockers.shop/product-category/elderberry-sambucus/