Quiet-Sun Explosive Events Observed in He ii λ304 with MOSES-06

In this paper the unique data from the Multi-Order Solar Extreme-Ultraviolet Spectrograph ( MOSES ) are used to investigate transition region explosive events in the He ii λ 304 spectral line. Particular attention is paid to two example events: one blueshifted jet and one bidirectional jet. Observations suggest that these events consist exclusively of high-velocity (∼100 km s −1 ) plasma. These two and other examples presented here exhibit a striking lack of emission in the line core. No acceleration phase is observed at the onset of either event. In total, 41 examples of explosive events are identified, including 5 blueshifted jets, 2 redshifted jets, and 10 bidirectional jets. The remaining 24 events resist simple classification, but observations indicate compact, highly Doppler-shifted emission. Event spatial scales and lifetimes are consistent with published explosive event characteristics. Data from the Michelson Doppler Imager provide magnetic context to the MOSES observations. Bidirectional jets lacking line core emission are interesting because they are predicted in models of Petschek reconnection in the transition region.