Low-energy (<100 eV) ion pitch angle distributions in the magnetosphere by ISEE 1

Details Low-energy (<100 eV) ion pitch angle distributions in the magnetosphere by ISEE 1 Low-energy (<100 eV) ion pitch angle distributions in the magnetosphere by ISEE 1

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.6944n&link_type=abstract

Journal of Geophysical Research, Volume 88, Issue A9, p. 6944-6960

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6

Scientific paper

Low-energy (<100 eV) ion data from the plasma composition experiment on ISEE 1 are examined statistically to study pitch angle distributions in all local times of the magnetosphere (L=3-10). The pitch angle distributions in the data set used here can be classified into seven types; however, there are four major types, i.e., isotropic distribution, bi-directional field-aligned distribution unidirectional field-aligned distribution, and low flux. The isotropic distribution that consists of very low energy (typically <10 eV) ions is a persistent feature in the inner region. It is frequently observed with an accompanying loss cone-like structure. The bi-directional field-aligned distribution consisting of warm ions (>=10 eV) is a persistent feature on the outer dayside and it is seen just outside the isotropic distribution region of the nightside. It is noted that the loss cone-like structure is also a common feature of this type of distribution in the noon sector. On the outer nightside the unidirectional field-aligned distribution consisting of warm ions is the dominant signature, but in some cases only the low flux (no appreciable flux) is observed. The `sources' of ions in various regions are discussed on the basis of these results and others.

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