Three-Dimensional Energetic Ion Bulk Flows at Comet P/Giacobini-Zinner

  1. Thomas J. Birmingham and
  2. Alexander J. Dessler
  1. I.G. Richardson1,
  2. S.W.H. Cowley1,
  3. R.J. Hynds1,
  4. T.R. Sanderson2,
  5. K-P. Wenzel2 and
  6. P.W. Daly3

Published Online: 19 MAR 2013

DOI: 10.1029/SP027p0048

Comet Encounters

Comet Encounters

How to Cite

Richardson, I.G., Cowley, S.W.H., Hynds, R.J., Sanderson, T.R., Wenzel, K.-P. and Daly, P.W. (1988) Three-Dimensional Energetic Ion Bulk Flows at Comet P/Giacobini-Zinner, in Comet Encounters (eds T. J. Birmingham and A. J. Dessler), American Geophysical Union, Washington, D.C.. doi: 10.1029/SP027p0048

Author Information

  1. 1

    Blackett Laboratory, Imperial College

  2. 2

    Space Science Department of ESA

  3. 3

    Max-Planck-Institut für Aeronomie

Publication History

  1. Published Online: 19 MAR 2013
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780875902395

Online ISBN: 9781118668757



  • Energetic Particle Anisotropy Spectrometer (EPAS);
  • International Cometary Explorer (ICE);
  • Solar wind-comet interaction;
  • Three-dimensional energetic ion bulk;
  • Water group ions


Using energetic ion data obtained by the EPAS experiment on the ICE spacecraft we investigate the three dimensional ion bulk flow in the mass loading region around the comet P/Giacobini-Zinner. We find relatively abrupt changes in flow speed (∼100 km s−1) at the boundaries between the pickup and mass loading regions. Flow deflections away from the comet tail of ∼15° are observed at the boundaries with peaks up to ∼30° inside the mass loading region. Ion energies of ∼300 keV are found inside the mass loading region which suggest the need to consider other ion acceleration mechanisms in addition to solar wind pickup.