Solar source regions of HE-3-rich particle events

Hydrogen alpha x-ray and metric and kilometric radio data were applied to examine the solar sources of energetic He-3-rich particle events observed near earth in association with impulsive 2 to 100 keV electron events. Each He-3/electron event is associated with a kilometric type 3 burst belonging to a family of such bursts characterized by similar interplanetary propagation paths from the same solar active region. The He-3/electron events correlate very well with the interplanetary low frequency radio brightnesses of these events, but progressively worse with signatures from regions closer to the Sun. When H alpha brightnings can be associated with He-3/electron events, they have onsets coinciding to within 1 min of that of the associated metric type 3 burst but are often too small to be reported. The data are consistent with the earlier idea that many type 3 bursts, the He-3/electron events, are due to particle acceleration in the corona, well above the associated H alpha and x-ray flares