Accession Number:

ADA171464

Title:

A Laboratory Study of Ion Energization by EIC (Electrostatic Ion Cyclotron) Waves and Subsequent Upstreaming along Diverging Magnetic Field Lines,

Descriptive Note:

Corporate Author:

IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY

Report Date:

1986-07-01

Pagination or Media Count:

9.0

Abstract:

A laboratory study related to energetic upstreaming ions in the ionosphere-magnetosphere system is described. The experiment was carried out in a cesium Q machine plasma with a region of nonuniform magnetic field. Electrostatic ion cyclotron waves were excited by drawing an electron current to a small biased exciter electrode. In the presence of the instability, ions are heated in the direction perpendicular to B. Using a gridded retarding potential ion energy analyzer, we followed the evolution of the ion velocity distribution as the ions passed through the heating region and subsequently flowed out along the diverging B field lines. As expected, the heated ions transfer their energy from perpendicular to parallel motion as they move through the region or diverging B field. Both their parallel thermal energy and the parallel drift energy increase at the expense of the perpendicular energy.

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE