Cool Stars 14 - Submitted Abstract # 143 This version created on 05 October 2006 A 3D-view of an highly active stellar atmosphere Uwe Wolter, Hamburger Sternwarte Juergen H.M.M. Schmitt, Hamurger Sternwarte We present a detailed view of the atmosphere of the highly active star BO Mic (= Speedy Mic). Based on densely sampled time series of high resolution optical and near-UV spectra, the view extends from the photosphere over the chromosphere to prominences far up in the corona. In this context we also analyze a small flare. ----------------------------------