First ENA observations at Mars:Solar-wind ENAs on the nightside
- Brinkfeldt, K.
- Gunell, H.
- Brandt, P. C.
- Barabash, S.
- Frahm, R. A.
- Winningham, J. D.
- Kallio, E.
- Holmström, M.
- Futaana, Y.
- Ekenbäck, A.
- Lundin, R.
- Andersson, H.
- Yamauchi, M.
- Grigoriev, A.
- Sharber, J. R.
- Scherrer, J. R.
- Coates, A. J.
- Linder, D. R.
- Kataria, D. O.
- Koskinen, H.
- Säles, T.
- Riihelä, P.
- Schmidt, W.
- Kozyra, J.
- Luhmann, J.
- Roelof, E.
- Williams, D.
- Livi, S.
- Curtis, C. C.
- Hsieh, K. C.
- Sandel, B. R.
- Grande, M.
- Carter, M.
- Sauvaud, J. A.
- Fedorov, A.
- Thocaven, J. J.
- McKenna-Lawler, S.
- Orsini, S.
- Cerulli-Irelli, R.
- Maggi, M.
- Wurz, P.
- Bochsler, P.
- Krupp, N.
- Woch, J.
- Fränz, M.
- Asamura, K.
- Dierker, C.
DOIAbstract
We present measurements with an Energetic Neutral Atom (ENA) imager on board Mars Express when the spacecraft moves into Mars eclipse. Solar wind ions charge exchange with the extended Mars exosphere to produce ENAs that can spread into the eclipse of Mars due to the ions' thermal spread. Our measurements show a lingering signal from the Sun direction for several minutes as the spacecraft moves into the eclipse. However, our ENA imager is also sensitive to UV photons and we compare the measurements to ENA simulations and a simplified model of UV scattering in the exosphere. Simulations and further comparisons with an electron spectrometer sensitive to photoelectrons generated when UV photons interact with the spacecraft suggest that what we...
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