Linear Effects of Varying Ion Composition on Perpendicularly-Driven Flute Modes: Comparison to Rocket Observation

  1. Tom Chang,
  2. M. K. Hudson,
  3. J. R. Jasperse,
  4. R. G. Johnson,
  5. P. M. Kintner and
  6. M. Schulz
  1. David N. Walker

Published Online: 21 MAR 2013

DOI: 10.1029/GM038p0311

Ion Acceleration in the Magnetosphere and Ionosphere

Ion Acceleration in the Magnetosphere and Ionosphere

How to Cite

Walker, D. N. (1986) Linear Effects of Varying Ion Composition on Perpendicularly-Driven Flute Modes: Comparison to Rocket Observation, in Ion Acceleration in the Magnetosphere and Ionosphere (eds T. Chang, M. K. Hudson, J. R. Jasperse, R. G. Johnson, P. M. Kintner and M. Schulz), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM038p0311

Author Information

  1. Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780875900636

Online ISBN: 9781118664216

SEARCH

Keywords:

  • Magnetosphere—Congresses;
  • Ionosphere—Congresses;
  • Ion flow dynamics—Congresses;
  • Space plasmas—Congresses

Summary

Electrostatic wave observations made during the injection of an Argon ion beam from the ARCS-I sounding rocket into the auroral ionosphere are compared to predictions of linear theory for a perpendicular ion beam-driven resonant instability. Assuming a two-ion component background plasma whose masses differ by at most a factor of two (e.g. O+, O2 +; O+, NO+), solutions are obtained as a function of varying ion composition both in the absence of a beam term (i.e., multicomponent ion Bernstein modes) and in the presence of an unmagnetized Ar+ ion beam assuming small thermal spreading of the beam. Numerical solutions for resonantly driven oscillations using small beam densities and perpendicular beam velocities yield increasing growth rates for increasing wave number, k, for the first three modes studied. An analytical approximation to the growth rates following a procedure similar to one used by Roth et al. 1983, is consistent with this conclusion.