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Inferring the Coronal Density Irregularity from EUV Spectra

Michael Hahn; Daniel Wolf Savin

Title:
Inferring the Coronal Density Irregularity from EUV Spectra
Author(s):
Hahn, Michael
Savin, Daniel Wolf
Date:
Type:
Articles
Department(s):
Astrophysics Laboratory
Volume:
829
Persistent URL:
Book/Journal Title:
The Astrophysical Journal
Abstract:
Understanding the density structure of the solar corona is important for modeling both coronal heating and the solar wind. Direct measurements are difficult because of line-of-sight integration and possible unresolved structures. We present a new method for quantifying such structures using density-sensitive extreme ultraviolet line intensities to derive a density irregularity parameter, a relative measure of the amount of structure along the line of sight. We also present a simple model to relate the inferred irregularities to physical quantities, such as the filling factor and density contrast. For quiet-Sun regions and interplume regions of coronal holes, we find a density contrast of at least a factor of 3–10 and corresponding filling factors of about 10%–20%. Our results are in rough agreement with other estimates of the density structures in these regions. The irregularity diagnostic provides a useful relative measure of unresolved structure in various regions of the corona.
Subject(s):
Sun's corona
Astrophysics
Spectroscopic imaging
Publisher DOI:
https://doi.org/10.3847/0004-637X/829/1/42
Item views
35
Metadata:
text | xml
Suggested Citation:
Michael Hahn, Daniel Wolf Savin, , Inferring the Coronal Density Irregularity from EUV Spectra, Columbia University Academic Commons, .

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