Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1816c&link_type=abstract
American Astronomical Society, SPD meeting #42, #18.16; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
Scientific paper
Excess broadening in the emission line spectra from non-thermal motions provide an unresolved energy input into the coronal plasma. The driving mechanism for and significance of the energy contributions of this non-thermal component has been a subject of much discussion. Observationally constraining the non-thermal contributions to line broadening in the coronal emission spectra provides valuable limitations which coronal physics models must take into account. Using full-CCD raster observations from EIS, we determine a distribution of non-thermal velocities for all lines in each full-CCD raster observation for both spatially-averaged and spatially-resolved EIS spectra. We present here composite non-thermal velocity distributions incorporating a multiple elements, ionization states and temperatures for a variety of EIS observations including both active region and quiet sun emission. We determine an expectation value for the velocity of the non-thermal component from this composite statistical approach. Initial spatially-averaged results from 7 independent EIS rasters show a strong Gaussian peak at approximately 20 km/s per second.. We address the implications of this consistent velocity and energy peak in the spatially-averaged results as well as present and compare our analysis from spatially-resolved spectra for each EIS raster included in the spatially-averaged study.
Coyner Aaron J.
Davila Jose Manuel
Kilper Gary K.
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