Showing papers by "Mary K. Hudson published in 1982"
TL;DR: In this article, the dispersion relation for k/sub parallel/ = 0 modes excited by warm ion rings in velocity space was studied and it was shown that waves are excited with real frequencies near the lower hybrid frequency and with growth rates ranging from approx.0.01 to 1 times the ion cyclotron frequency.
Abstract: Discrete emissions at the lower hybrid frequency are often seen on the S3-3 satellite. Simultaneous observation of perpendicularly heated ions suggests that ions may provide the free energy necessary to drive the instability. Studies of the dispersion relation for k/sub parallel/ = 0 modes excited by warm ion rings in velocity space show that waves are excited with real frequencies near the lower hybrid frequency and with growth rates ranging from approx.0.01 to 1 times the ion cyclotron frequency. Numerical results are therefore consistent with the possibility that the observed ions are the free energy source for the observed waves.
40 citations
01 Jan 1982
TL;DR: In this paper, time-stationary solutions to the Vlasov-Poisson equation for ion holes and double layers were examined along with particle simulations which pertain to recent observations of small amplitude (e phi)/t sub e approx. 1 electric field structures on auroral field lines.
Abstract: Time-stationary solutions to the Vlasov-Poisson equation for ion holes and double layers were examined along with particle simulations which pertain to recent observations of small amplitude (e phi)/t sub e approx. 1 electric field structures on auroral field lines. Both the time-stationary analysis and the simulations suggest that double layers evolve from holes in ion phase space when their amplitude reaches (e phi)/t sub e approx. 1. Multiple small amplitude double layers which are seen in long simulation systems and are seen to propagate past spacecraft may account for the acceleration of plasma sheet electrons to produce the discrete aurora.
4 citations