Affiliation: | (1) NASA Goddard Space Flight Center, 20771 Greenbelt, MD, USA;(2) Max-Planck-Institut für Physik u. Astrophysik, Institut für Extraterrestrische Physik, D-8046 Garching, F.R.G.;(3) Hansen Laboratories of Physics and Dept. of Physics, Stanford University, 94305 Stanford, CA, USA;(4) Grumman Aerospace Corporation, 11714 Bethpage, NY, USA |