The Second Order Fermi Acceleration of Pick-Up Ions

  1. Alan Johnstone
  1. Peter Duffy

Published Online: 26 MAR 2013

DOI: 10.1029/GM061p0287

Cometary Plasma Processes

Cometary Plasma Processes

How to Cite

Duffy, P. (1991) The Second Order Fermi Acceleration of Pick-Up Ions, in Cometary Plasma Processes (ed A. Johnstone), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM061p0287

Author Information

  1. School of Cosmic Physics, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland

Publication History

  1. Published Online: 26 MAR 2013
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780875900278

Online ISBN: 9781118663660



  • Comets;
  • Space plasmas;
  • Astrophysics


A theoretical model for the second order Fermi acceleration of photo-ionised, pick-up ions is presented. This acceleration is caused by the scattering off magnetic turbulence in the solar wind upstream of the comet's bow shock. Exact solutions for the energetic particle spectrum are found and compared with measurements made near comet Halley.