Determination Of Non-thermal Velocity Distributions From Spatially-averaged EUV Spectra Observed With SERTS And Hinode/EIS

Details Determination Of Non-thermal Velocity Distributions From Spatially-averaged EUV Spectra Observed With SERTS And Hinode/EIS Determination Of Non-thermal Velocity Distributions From Spatially-averaged EUV Spectra Observed With SERTS And Hinode/EIS

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640710c&link_type=abstract

American Astronomical Society, AAS Meeting #216, #407.10; Bulletin of the American Astronomical Society, Vol. 41, p.861

Astronomy and Astrophysics

Astronomy

Scientific paper

Unresolved non-thermal broadenings have been reported in observations of solar EUV spectra for decades. These unresolved broadenings are generally attributed to non-thermal motions within coronal plasma loops and have been shown to provide a limitation on the maximum available energy in the coronal plasma to facilitate coronal heating. Therefore, determining an average non-thermal velocity component of the broadening in observed EUV line profiles provides a significant observational constraint for all coronal heating models to address. We have analyzed spatially-averaged spectra from both the Solar EUV Research Telescope and Spectrograph (SERTS) over the EUV bandpass from 170-420 angstroms in a variety of solar conditions, from quiet sun to active region to off-limb data. For each instrument, we construct a non-thermal velocity, , distributions for active region and quiet sun emission lines respectively. We then fit each distribution with a Gaussian to determine the typical unresolved non-thermal velocities observed in both quiet sun and active region distributions. Ideally, if no non-thermal component exists the distributions would all peak at zero, but in the case of the SERTS observations, we find the distributions peak at velocities between 21-25 km/s regardless of solar activity. Building off of the SERTS analysis, we create similar distributions using spatially-averaged line profiles from Hinode/EIS observations to use the increased spectral resolution of EIS to refine the non-thermal velocity constraints determined with SERTS.

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