A Study of the Statistical Behavior of Ion Temperatures from De 1 / RIMS

  1. Gordon R. Wilson
  1. P. D. Craven1,
  2. R. H. Comfort2,
  3. D. L. Gallagher1 and
  4. R. West3

Published Online: 18 MAR 2013

DOI: 10.1029/GM062p0173

Modeling Magnetospheric Plasma Processes

Modeling Magnetospheric Plasma Processes

How to Cite

Craven, P. D., Comfort, R. H., Gallagher, D. L. and West, R. (1991) A Study of the Statistical Behavior of Ion Temperatures from De 1 / RIMS, in Modeling Magnetospheric Plasma Processes (ed G. R. Wilson), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM062p0173

Author Information

  1. 1

    NASA/Marshall Space Flight Center, Space Science Laboratory, Huntsville, AL, 35812

  2. 2

    Center for Space and Aeronomy Research, University of Alabama in Huntsville, Huntsville, AL, 35809

  3. 3

    Boeing Computer Support Services, Inc., Boeing Corporation, Huntsville, AL, 35814

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780875900285

Online ISBN: 9781118663905



  • Space plasmas—Mathematical models—Congresses;
  • Magnetosphere—Mathematical models—Congresses


Retarding Ion Mass Spectrometer (RIMS) observations made from the Dynamics Explorer 1 satellite are averaged over one minute intervals and used to derive over 20,000 measurements of hydrogen ion temperatures. Temperatures are sorted by L-shell, local time, magnetic (Kp) and solar activity (F10.7). Average temperatures increase with L-shell. On lower L-shells, L < 3, the average temperatures increase with F10.7 but are generally less than 0.8 eV. No dependence on geomagnetic activity is found for L-shells less than 2. On higher L-shells, the average temperature increases with Kp, in some cases reaching a maximum of about 25 eV, but is usually less than 15 eV. In the lower L-shells, diurnal effects are small, less than 0.15 eV, for low F10.7 and less than 0.1 eV for high F10.7. On the higher L-shells the temperature appears to be independent of day-night conditions and of F10.7 flux. The behavior of the average temperature is indicative of both an ionospheric and an outer plasmaspheric heat source for plasmaspheric ions.