[4]
Washington, D. C.: National Academy Press, 1993.
Figure 1: Proton temperature anisotropy (the ratio of
perpendicular to parallel temperature minus 1) vs. parallel plasma
beta observed in the subsolar magnetosheath at times of quasi-perpendicular upstream conditions together with isocontours of
constant growth rate for the proton cyclotron and mirror
instabilities. The solid curve shows the contour of proton
cyclotron growth rate of 0.01 
, and the dotted curve
shows the corresponding contour for the mirror mode assuming 4%
He
. The data fall along or near a line essentially parallel
to the contours of constant instability growth, indicating that the
plasma characteristics are closely tied to the waves. (From
Anderson et al. [1994])
Figure 2: Time series of magnetic perturbation vectors
drawn every 5 s during a westward moving traveling vortex event
observed in local morning at three of the MACCS sites: Pangnirtung
(PG), Cape Dorset (CD), and Repulse Bay (RB). The H axis points
toward magnetic north, and the D axis toward magnetic east. PG, the
most eastward station, observed several smaller vortices following
the main vortex, while RB, the most westward station, observed more
smaller vortices before the largest vortex arrived. (From
Hughes et al. [1994])
Figure 3: Time history of the ionospheric magnetic field
at 9:00 magnetic local time (MLT) from a numerical simulation with
240-second period driving pulse. The vertical axis shows invariant
(magnetic) latitude. Magnetic disturbance vectors are normalized
such that the distance between adjacent grid points is 5 nT. (From
Lysak et al. [1994])