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 . 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.