Figure 1: Solar wind conditions recorded at the Wind spacecraft, showing the arrival of a CME, with associated interplanetary shock and strong dynamic pressure fluctuations, on 24 Sept. 1998 at 2320 UT, and continuing for several hours thereafter. The data are averaged over the hour prior to plotted time.
Figure 2: Association of DE-1 upwelling O escape flux with the hourly average deviation of the solar wind dynamic pressure from the ISEE-1 spacecraft, for the solar maximum epoch 1981-2. The data sets are as described by Pollock et al. . This data was previously presented by Pollock et al. . Also shown are data points from the present study (open symbols).
Plate 1: Northern polar wind, mantle and cleft region conditions recorded at the POLAR spacecraft in response to the CME that arrived at the Earth on 24 Sept. 1998. The MHD compression arrives at POLAR near 23:45 UT. The "+/-" symbols indicate the spin angles corresponding to field parallel and antiparallel ion motion. The "x" symbols indicate the spin angle corresponding to s/c motion. The magnetic field data are displayed as differences from a model field, normalized to the model field magnitude.
Plate 2: Southern cleft and polar cap conditions recorded at the POLAR spacecraft subsequent to the passage of a CME past the magnetosphere on 24-25 Sept. 1998. Southern cleft crossing occurs near 07:05-07:15 UT. Ion fluxes for TIDE are transformed to 1000 km altitude for comparison purposes.
© 1999 American Geophysical Union