Comparison of greater than or similar to 40 keV electron events at high and low heliolatitudes: Ulysses/HI-SCALE and ACE/EPAM

We have performed a joint survey of anisotropic greater than or similar to 40 keV electron events from August 1997 to September 2000 using the matched detectors on the Ulysses (ULS)/HI-SCALE and the ACE/EPAM instruments. A co mputer algorithm selected events with strong, statistically significant pit ch-angle anisotropies. Electron pitch-angle distributions at ACE (similar t o1 AU) are often 'beams' that are strongly collimated along the local inter planetary magnetic field (IMF). These flare-associated impulsive injections can display rapid rise times (similar to 15 min) and slower decays, or mor e irregular intensity histories. At ULS, the electron intensities are lower and the time histories smoother, but strong anisotropies are still observa ble, indicating direct, nearly field-aligned propagation outward from the S un. We focus on four event periods, selected from the survey, during times when the angle between the footpoints of the IMF lines intersecting ACE and ULS is small. These events span three full years and cover a wide range of distances and heliographic latitudes. We found one reasonably good associa tion between impulsive electron events at ACE and ULS, and two events with small field-aligned gradients.