Author/Authors :
Galli، نويسنده , , Jürgen A. and Wurz، نويسنده , , P. and Bochsler، نويسنده , , P. and Barabash، نويسنده , , S. and Grigoriev، نويسنده , , A. and Futaana، نويسنده , , Y. and Holmstrِm، نويسنده , , M. and Gunell، نويسنده , , H. and Andersson، نويسنده , , Alison H. and Lundin، نويسنده , , R. and Yamauchi، نويسنده , , M. and Brinkfeldt، نويسنده , , K. and Fraenz، نويسنده , , William M. and Krupp، نويسنده , , N. and Woch، نويسنده , , J. and Baumjohann، نويسنده , , W. a، نويسنده ,
Abstract :
The ASPERA-4 instrument on board the Venus Express spacecraft offers for the first time the possibility to directly measure the emission of energetic neutral atoms (ENAs) in the vicinity of Venus. When the spacecraft is inside the Venus shadow a distinct signal of hydrogen ENAs usually is detected. It is observed as a narrow tailward stream, coming from the dayside exosphere around the Sun direction. The intensity of the signal reaches several 10 5 cm - 2 sr - 1 s - 1 , which is consistent with present theories of the plasma and neutral particle distributions around Venus.
