Theory and observation of energetic ions in the lobes of the geomagnetic tail

Details Theory and observation of energetic ions in the lobes of the geomagnetic tail Theory and observation of energetic ions in the lobes of the geomagnetic tail

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..761o&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, May 1991, p. 761-775.

Computer Science

1

Energetic Particles, Geomagnetic Tail, Ion Temperature, Solar Terrestrial Interactions, International Sun Earth Explorer 3, Plasma Layers, Satellite-Borne Instruments

Scientific paper

The Owen et al. (1990) model, which attempts to explain the nature of the pitch angle distributions of energetic ions within the lobes of the distant geomagnetic tail is briefly reviewed. Energetic ion data from the ISEE-3 spacecraft obtained during early 1983, when the spacecraft made several traversals of the distant geomagnetic tail are then presented. The data demonstrate that during quiet periods in which the spacecraft is continuously located in the tail lobes, the pitch angle distribution is observed to be highly anisotropic, being peaked closely perpendicular to the magnetic field direction, but with a small net flow in the antisunward direction, in agreement with the model results. Further predictions of the model, concerning the variation of the lobe energetic ion distributions with position in the lobes, are compared to observations made as the spacecraft performed a traversal of the lobe. Finally, since the model indicates that a more isotropic distribution should exist in the tail lobe during solar particle events, data is presented from such a period for further comparison. In all the above cases, good agreement is demonstrated between the data and the expections of the model.

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