Characterization of Solar Coronal Holes and Plumes Using Spectroscopic Diagnostic Techniques Applied to SOHO/CDS Observations |
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Authors: | G Del Zanna B J I Bromage |
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Institution: | (1) Centre for Astrophysics, University of Central Lancashire, Preston, PR1 2HE, UK |
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Abstract: | Results from a series of SOHO/Coronal Diagnostic Spectrometer (CDS) observations of coronal holes and plumes are presented,
including analysis of a low-latitude plume observed in August 1996. Spectroscopic diagnostic techniques using the CHIANTI
atomic database are applied to derive the plasma parameters: electron density, temperature, and element abundances. The results
are compared with quiet sun values. Coronal electron densities in the holes are found to be about 2 × 108 cm-3, a factor of two to three lower than in the quiet sun. The plasma thermal distribution exhibits differences between coronal
holes, the quiet sun and plumes. For example, the peak of the emission in coronal holes is at a lower temperature (T ⋍ 8 ×
105 K) than in the quiet sun (T ⋍ 1 × 106 K), while plumes are cooler (T ⋍ 7.6 × 105 K) and show a different distribution, closer to an isothermal state.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | solar corona spectroscopic diagnostics plumes |
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