Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1302c&link_type=abstract
American Astronomical Society, SPD meeting #40, #13.02; Bulletin of the American Astronomical Society, Vol. 41, p.832
Other
Scientific paper
The determination of non-thermal velocities from spectral line observations provide insight into the availability of additional energy sources within the observed regions of the corona. These non-thermal velocities can be attributed to waves, electron beams, turbulent motions among other potential sources. Observationally constraining these velocities directly limits the available energy for heating within the observed coronal regions. We present the determination of non-thermal velocity distributions from the 397 identified lines from the SERTS 1991-1997 flights covering the spectral range 171-355 angstroms along with the distributions for the 253 lines identified in active regions, the 102 lines from quiet sun regions, and 42 lines from off limb observations respectively. We find that for all four the velocity distributions peak at non-thermal velocities between 23-30 km/s independent of activity level suggesting that many of these non-thermal velocities are likely the result of non-thermal motions of cooling plasma visible in both active and quiet regions; however the active region distribution does exhibit a more pronounced high velocity tail with a secondary bump which could .be the result of a component resulting from heating of the coronal plasma.
Coyner Aaron J.
Davila Jose Manuel
Ofman Leon
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