Energetics of Transition Region Dynamics Observed by SUMER on SOHO

Details Energetics of Transition Region Dynamics Observed by SUMER on SOHO Energetics of Transition Region Dynamics Observed by SUMER on SOHO

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.2305w&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #23.05; Bulletin of the American Astronomical Society, Vol. 31, p.861

Astronomy and Astrophysics

Astronomy

Scientific paper

The plasma constituting the solar transition region exhibits a variety of motions, including directed flows, non-thermal mass motions (or microturbulence) and, in the most extreme cases, highly skewed or extremely broadened velocity distributions. These extreme motions result in shifted, broadened, and skewed spectral lines commonly referred to as explosive events. Using high spectral, spatial, and temporal resolution SUMER data of various transition region lines, we have developed new criteria to define explosive events and present a summary of explosive event characteristics, such as birthrate, average lifetime, and average energy. We have also employed a new method of deriving the energy flux associated with explosive event line profiles. Our results show that previous measurements of energy flux, estimated from characteristic velocities of the plasma, are an order of magnitude, or more, too low. Using the more correct measure of energy flux, we have, for the first time, developed the energy distribution ((dN)/(dE)) of explosive events, taking into account projection effects. We will compare the energy distribution of event profiles to ``normal'' non-event profiles and discuss the implications on solar coronal heating, nanoflares, and explosive event theory.

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