Institution: | a Astronomical Institute, Kharkov National University, 35 Sumska St., Kharkov, 61022, Ukraine b Astronomy, Department of Physics, University of Oulu, FIN-90014, Oulu, Finland c Department of Geological Sciences, Brown University, Providence, RI 02912-1846, USA d Space Science Institute, 3100 Marine St., Suite A353, Boulder, CO 80303-1058, USA e Astronomical Institute Anton Pannekoek, University of Amsterdam, Kruislaan 403, NL-1098 SJ, Amsterdam, The Netherlands f Department of Astronomy, Cornell University, 402 Space Sci. Building, Ithaca, NY 14853-6801, USA |