, Space Sci. Rev, vol.138, p.237, 2008.
, ApJ, vol.810, p.5, 2015.
, Icarus, vol.210, p.881, 2010.
, Geophys. Res. Lett, vol.18, p.261, 1991.
, Science, vol.349, p.671, 2015.
, A&A, vol.583, p.1, 2015.
, Icarus, vol.235, p.156, 2014.
, A&A, vol.583, p.6, 2015.
, ApJ, vol.229, p.402, 1979.
, Earth, Moon and Planets, vol.89, p.161, 2002.
, , vol.II, p.695, 2004.
, Icarus, vol.85, p.205, 1990.
, , vol.21, p.155, 1979.
, Icarus, vol.243, p.58, 2014.
, Icarus, vol.159, p.239, 2002.
, Icarus, vol.210, p.455, 2010.
, Icarus, vol.224, p.154, 2013.
, Icarus, vol.252, p.1, 2015.
, Science, vol.525, p.500, 2015.
, Nature, vol.508, p.233, 2014.
, A&A, vol.583, p.1, 2015.
, Geophys. Res. Lett, vol.42, p.5170, 2015.
, Icarus, vol.222, p.540, 2013.
, Nature, vol.529, p.368, 2016.
, A&A, vol.588, p.134, 2016.
, ApJ, vol.802, p.12, 2015.
, Icarus, vol.187, p.16, 2007.
, Icarus, vol.222, p.580, 2013.
, A&A, vol.583, p.1, 2015.
, J. Geophys. Res.: Planets, vol.98, p.15091, 1993.
, Science, vol.347, p.709, 2015.
, Icarus, vol.219, p.618, 2012.
, Icarus, vol.213, p.710, 2011.
, A&A, vol.583, p.1, 2015.
, A&A, vol.355, p.809, 2000.
, Science, vol.347, issue.2, 2015.
, J. Geophys. Res, vol.113, p.12004, 2008.
, Earth, Moon and Planets, vol.90, p.249, 2002.
, Nature, vol.321, p.320, 1986.
, Space Sci. Rev, vol.128, p.433, 2007.
, A&A, vol.579, p.5, 2015.
, A&A, vol.583, p.1, 2015.
, J. Geophys. Res, vol.82, p.4249, 1977.
, Adv. Space Res, vol.23, p.1309, 1999.
, Icarus, vol.89, p.73, 1991.
, Planet. Space Sci, vol.87, p.46, 2014.
, Icarus, vol.109, p.121, 1994.
, A&A, vol.583, p.1, 2015.
, A&A, vol.332, p.1123, 1998.
, A&A, vol.583, p.1, 2015.
, Geophysical Research Abstracts, vol.17, p.9767, 2015.
, A&A, vol.548, p.1, 2012.
, A&A, vol.569, p.1, 2014.
, Science, vol.349, p.1, 2015.
, A&A, vol.583, p.1, 2015.
, A&A, vol.592, p.69, 2016.
, A&A, vol.583, p.1, 2015.
, A&A, vol.583, p.1, 2015.
, Comets II, vol.1, p.359, 2004.
, Planet. Sp. Sci, vol.50, p.983, 2002.
, Icarus, vol.209, p.753, 2010.
, Science, vol.347, p.3905, 2015.
, Icarus, vol.2, p.115, 1963.
, A&A, vol.583, p.1, 2015.
, Nature, vol.518, p.216, 2015.
, Science, vol.304, p.1769, 2004.
, Science, vol.347, p.1044, 2015.
, Icarus, vol.221, p.1, 2012.
, Icarus, vol.153, p.180, 2001.
, Icarus, vol.212, p.867, 2011.
, Science, vol.349, p.657, 1961.
, Icarus, vol.222, p.610, 2013.
, A&A, vol.583, p.1, 2015.
, Science, vol.347, p.1, 2015.
, A&A, vol.512, p.1, 2010.
, A&A, vol.587, p.14, 2016.
, Icarus, vol.47, p.302, 1981.
, J. Geophys. Res, p.358, 1984.
, Germany e-mail: hoefner@mps.mpg.de 2 Institute for Geophysics and Extraterrestrial Physics, TU Braunschweig, 38106 Braunschweig, vol.516, p.75120
, Sidlerstrasse 5, Switzerland 6 Department of Physics and Astronomy "G. Galilei, vol.3, p.35122
, University of Padova, via Venezia 15, 35131 Padova, Italy 8 Department of Physics and Astronomy "G. Galilei, vol.3, p.35122
PO Box 78, 28691 Villanueva de la Cañada, European Space Agency (ESA), vol.7326, 2201. ,
, Gauss Professor Akademie der Wissenschaften zu Göttingen, p.37077
,
Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195 Meudon Principal Cedex, France 17 LATMOS, CNRS/UVSQ/IPSL, 11 boulevard d'Alembert, p.78280 ,
,
, , vol.11, p.34143
Italy 19 Instituto de Astrofisica de Andalucia-CSIC, Glorieta de la Astronomia, 18008 Granada, vol.2, p.12489 ,
Germany 21 Institute for Space Science, 32054. ,
, Muegyetem rkp 3, 1111 Budapest, Hungary 23 ESA/ESAC, PO Box 78, 28691 Villanueva de la Cañada, PO Box, vol.67, 1525.