Observation of an impulsive solar electron event extending down to similar to 0.5 keV energy

We present the first observation of a solar impulsive electron event spanning the entire solar wind-suprathermal particle energy range (few eV to hundreds of keV), obtained with the 3-D Plasma and Energetic Particle experiment on the WIND spacecraft. The electron energy spectrum fits to a power-law similar to E(-3) from similar to 40 keV down to a peak at less than or similar to 1 keV, with significant flux detected down to similar to 0.5 keV. Since the range of such low energy electrons in ionized hydrogen is much less than the column density of the corona, they must be accelerated high, similar to 1 R. (solar radius) above the photosphere, for typical active coronal density models.