1. Dublin Institute for Advanced Studies, School of Cosmic Physics, 5 Merrion Square, Dublin 2, Ireland. E-mail: aavdeeva@cp.dias.ie.
2. Dublin Institute for Advanced Studies, School of Cosmic Physics, Dublin, Ireland and Russian Academy of Sciences, Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, 142190, Troitsk, Moscow region, Russian Federation. E-mail: d.avdeev@mtu-net.ru.