S. Bastin, Institut Pierre Simon Laplace/ Service d'Aeronomie, Palaiseau cedex, France; and P. Drobinski, A. M. Dabas, P. Delville, O. Reitebuch, and C. Werner
Danijel Belusic, Andrija Mohorovicic Geophysical Institute, Faculty of Science, University of Zagreb, Zagreb, Croatia; and D. Koracin, I. Kos, A. Jericevic, and K. Horvath