Figure 1:
(top) Shows the magnetic field, in GSM coordinates, observed with
the INTERBALL-1 spacecraft, during 0000-0800 UT, March 28, 1996.
(bottom) Solid lines show the magnetic field, in GSM coordinates,
observed with the POLAR spacecraft. Dotted lines show the model field
by Tsyganenko [1995]. The attached text shows the
position of POLAR in GSM coordinates.
Figure 2:
(top) Shows ground magnetometer X components data for the same
interval as Figure 1. Superposed half-circles show the local dusk
(1800 LT), and triangles show the local midnight (0000 LT).
(middle) Shows the magnetic field observed at POLAR minus the model field,
expressed in the ``field-aligned coordinate system''. See text for the
definition of the coordinate system.
(bottom) Shows the data from the GEOTAIL spacecraft: From top, the plasma
ion velocity components in GSM coordinates, plasma ion density and
temperature.
Refer to the text for vertical lines A through D.
