Accession Number:

ADA175756

Title:

Kinetic Model of Auroral Plasma Formation II: Simultaneous Multi-Satellite Ion Observations and Interpretations.

Descriptive Note:

Technical rept.,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB

Report Date:

1986-09-30

Pagination or Media Count:

52.0

Abstract:

A detailed analysis of ion composition and distribution observed simultaneously by GEOS 2, SCATHA, and ISEE 1 satellites at the initial phases of an injection event in the inner magnetosphere was made. The mean convection electric field observed by GEOS 2 during the data interval was used to determine the space t ime variation of a global time dependent convection electric field model, which is approximately verified in this report by ISEE 1 plasma flow measurements and by the unusual SCATHA observation of low energy ions convected from the plalsmasphere cloak region. Theoretical tracing of ion trajectories with the tested electric field model indicates that multi satellite observations of keV ion dispersion can be interpreted in terms of a collisionmixing between an injected auroral ion population rich in oxygen with a preinjection population rich in hydrogen and doubly-ionized helium which had previously moved inward from ISEE 1 orbit. The results of this collisionmixing was that ion dispersion signatures afterwards appeared as if they were from a single population, having lost memory of their previous convection history. This is a possible formulation mechanism of th e ad hoc injection boundary which is marked only by plasma dispersion signature and not by any other magnetospheric feature.

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE