The velocity distribution function of the neutral lithium cloud produced by an AMPTE solar wind release

Details The velocity distribution function of the neutral lithium cloud produced by an AMPTE solar wind release The velocity distribution function of the neutral lithium cloud produced by an AMPTE solar wind release

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..965c&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Aug. 1987, p. 965-976.

Physics

4

Ampte (Satellites), Distribution Functions, Lithium, Metal Ions, Solar Wind, Velocity Distribution, Clouds, Ion Motion, Photoionization

Scientific paper

On Sept. 20, 1984 a release of photoionizing lithium neutrals was made in the quiet solar wind by the AMPTE-IRM spacecraft. The MSSL ion instrument on board the UKS spacecraft that was positioned about 30 km from the release center enabled measurement of significant fluxes of lithium ions to be made for about 3 min after the release; that is, long after the initial (about 25-s) local perturbation to the field and flow had died away. Here, the MSSL ion detector response to the release ions is examined in detail, showing that the ion measurements are consistent with injection into a cycloidal orbit. Knowing the ion orbit, it is then possible to trace the expansion of the neutral lithium cloud and obtain its initial velocity distribution. Various preliminary analyses suggested a shell-like expansion of the cloud, but disagreed over its velocity. The more detailed analysis of the UKS data presented here shows that it is not possible to determine from these data whether or not the cloud is shell-like, but reveals that significant local anisotropy is present.

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