Geophysica 44:1–2

Contents: Ari Viljanen, Antti Pulkkinen & Risto Pirjola, Prediction of the Geomagnetic K Index Based on its Previous Value; Martin Vermeer, Temperature and Water Vapour Profiling by Carrier Phase GNSS Observables on Board a Radiosonde; Maxim Smirnov & al., Broadband Magnetotelluric Instruments for Near-surface and Lithosperic Studies of Electrical Conductivity. A Fennoscandian Pool of Magnetotelluric Instruments; Jouni Räisänen & Leena Ruokolainen, Ongoing Global Warming and Local Warm Extremes. A Case Study of Winter 2006-2007 in Helsinki, Finland; Tapio J. Tuomi & Antti Mäkelä, Thunderstorm Climate of Finland 1998-2007.