Showing papers by "John Morgan published in 1985"
TL;DR: Spectroscopic measurements of lines from both forbidden S II and forbidden O II in the Io torus taken on 15 nights spread over four months in 1981 are presented and discussed in this paper.
53 citations
TL;DR: In this paper, the authors analyzed the spectroscopic data reported by Morgan (1985) to analyze the three-dimensional models of the Io torus, including variations in the torus plasma properties with longitude, latitude, and distance from Jupiter.
31 citations
TL;DR: In this paper, the Io torus was studied by obtaining short exposure images in the forbidden S II 6731 A emission line over as long intervals and on as many nights as possible.
Abstract: The Io plasma torus was studied by obtaining short exposure images in the forbidden S II 6731 A emission line over as long intervals and on as many nights as possible. The results support the earlier conclusion drawn from ground-based data that the red forbidden S II emission is often brightest approximately in the active sector. It is shown that the region of strongest S II intensity modulation with magnetic longitude is essentially coincident with the region of brightest S III EUV emission. The possible effects of subcorotational velocities on ion density distributions in the torus are discussed.
23 citations