Explosive Events
High-resolution ultraviolet (UV) spectra of the solar
outer atmosphere show transient brightenings often referred to as explosive
events. These are localized regions with small spatial extent that
show sudden enhancements of line intensities associated with strong non-Gaussian
broadenings at temperatures between 20,000 -- 200,000 K. Several thousand
of these occur on the Sun every hour.
Explosive events in O VI (~250,000K)
A sequence of Explosive
events
as viewed in Si IV. Although they play a role in
heating the corona, they are not sufficient in number or energy to be only
source.