Affiliation: | 1. Lebedev Physical Institute Russian Academy of Sciences, Leninsky Prospect, 53, Moscow, 119991, Russia 2. Sodankyl? Geophysical Observatory, University of Oulu, P.O. Box 3000, Oulu, Finland 3. Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland 4. University of Reading, Earley Gate, P.O. Box 243, Reading, RG6 6BB, UK 5. Ioffe Physical-Technical Institute, St. Petersburg, 194021, Russia
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