First observation of energetic neutral atoms in the Venus environment.

A. Galli, P. Wurz, P. Bochsler, S. Barabash, A. Grigoriev, Y. Futaana, M. Holmstrom, H. Gunell, H. Andersson, R. Lundin, M. Yamauchi, K. Brinkfeldt, M. Fraenz, N. Krupp, J. Woch, W. Baumjohann, H. Lammer, T. L. Zhang, K. Asamura, A. J. CoatesD. R. Linder, D. O. Kataria, C. C. Curtis, K. C. Hsieh, B. R. Sandel, J. A. Sauvaud, A. Fedorov, C. Mazelle, J. J. Thocaven, M. Grande, E. Kallio, T. Sales, W. Schmidt, P. Rilhela, H. Koskinen, J. Kozyra, J. Luhmann, S. McKenna-Lawlor, S. Orsini, R. Cerulli-Irelli, A. Mura, A. Milillo, M. Maggi, E. Roelof, P. Brandt, C. T. Russell, K. Szego, D. Winningham, R. Frahm, J. Scherrer, J. R. Sharber

Research output: Contribution to journalArticle

16 Citations (Scopus)


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 , which is consistent with present theories of the plasma and neutral particle distributions around Venus.
Original languageEnglish
Pages (from-to)807-811
Number of pages5
JournalPlanetary and Space Science
Issue number6
Publication statusPublished - May 2008


  • Venus exosphere
  • ENAs
  • Solar wind–planetary atmosphere interaction


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