Accession Number : AD0734034

Title :   Thermalization of Colliding Ion Streams Beyond the Plasmapause.

Descriptive Note : Rept. for Oct 70-May 71,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Schulz,Michael ; Koons,Harry C.

Report Date : 15 SEP 1971

Pagination or Media Count : 26

Abstract : On field lines that are closed, oppositely directed plasma flows analogous to the polar wind can originate from conjugate regions of the ionosphere and encounter each other near the equatorial plane. For a background plasma of sufficiently low equatorial density (N sub 0 < or = 20/cc), thermalization of the two streams can occur through the excitation of unstable ion waves. At higher densities (N sub O > or = 20/cc) thermalization occurs via Coulomb collision. These flows, together with the complementary thermalization mechanisms, constitute a rapid means of replenishing the plasmasphere (d(N sub O)/dt about 10/cc-hr) during the recovery phase of a magnetic storm. Beyond the quiet-day plasmapause location, the conditions for two-stream instability appear to be present continuously, since the counter-streaming plasmas are simultaneously convected to the magnetospheric boundary. (Author)

Descriptors :   (*MAGNETOSPHERE, THERMAL PROPERTIES), ION BEAMS, MAGNETIC STORMS, STABILITY, DISTRIBUTION FUNCTIONS, DISPERSION RELATIONS, SUPERSONIC FLOW, NUMERICAL ANALYSIS, SOLAR WIND, PARTICLE TRAJECTORIES

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE