Improved bow shock model with dependence on the IMF strength

We have accumulated a large set of bow shock crossings observed by INTERBALL-1, MAGION-4, GEOTAIL, IMP 8, and CLUSTER-2 spacecraft and complemented this set with upstream measurements of WIND with motivation to improve the accuracy of a prediction of the bow shock location provided by the Němeček and Å afránková (J. Atmos. Terr. Phys. 53 (1991) 1049) model. Although proposed corrections conserve a simplicity of the original model, they decrease significantly the most probable error of the prediction.