The loss of ions from Venus through the plasma wake

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

148 Citations (SciVal)


Venus, unlike Earth, is an extremely dry planet although both began with similar masses, distances from the Sun, and presumably water inventories. The high deuterium-to-hydrogen ratio in the venusian atmosphere relative to Earth’s also indicates that the atmosphere has undergone significantly different evolution over the age of the Solar System1. Present-day thermal escape is low for all atmospheric species. However, hydrogen can escape by means of collisions with hot atoms from ionospheric photochemistry2, and although the bulk of O and O2 are gravitationally bound, heavy ions have been observed to escape3 through interaction with the solar wind. Nevertheless, their relative rates of escape, spatial distribution, and composition could not be determined from these previous measurements. Here we report Venus Express measurements showing that the dominant escaping ions are O+, He+ and H+. The escaping ions leave Venus through the plasma sheet (a central portion of the plasma wake) and in a boundary layer of the induced magnetosphere. The escape rate ratios are Q(H+)/Q(O+) = 1.9; Q(He+)/Q(O+) = 0.07. The first of these implies that the escape of H+ and O+, together with the estimated escape of neutral hydrogen and oxygen, currently takes place near the stoichometric ratio corresponding to water.
Original languageEnglish
Pages (from-to)650-653
Number of pages4
Issue number7170
Publication statusPublished - 29 Nov 2007


Dive into the research topics of 'The loss of ions from Venus through the plasma wake'. Together they form a unique fingerprint.
  • Author Correction: The loss of ions from Venus through the plasma wake

    Barabash, S., Fedorov, A., Sauvaud, J. J., Lundin, R., Russell, C. T., Futaana, Y., Zhang, T. L., Andersson, H., Brinkfeldt, K., Grigoriev, A., Holmström, M., Yamauchi, M., Asamura, K., Baumjohann, W., Lammer, H., Coates, A. J., Kataria, D. O., Linder, D. R., Curtis, C. C., Hsieh, K. C., & 30 othersSandel, B. R., Grande, M., Gunell, H., Koskinen, H. E. J., Kallio, E., Riihelä, P., Säles, T., Schmidt, W., Kozyra, J., Krupp, N., Fränz, M., Woch, J., Luhmann, J., McKenna-Lawlor, S., Mazelle, C., Thocaven, J. J., Orsini, S., Cerulli-Irelli, R., Mura, A., Milillo, A., Maggi, M., Roelof, E., Brandt, P., Szego, K., Winningham, J. D., Frahm, R. A., Scherrer, J., Sharber, J. R., Wurz, P. & Bochsler, P., 09 May 2022, In: Nature. 605, 7911, 1 p., E10.

    Research output: Contribution to journalCorrectionpeer-review

    Open Access
    16 Downloads (Pure)

Cite this