Intensity Distribution and Contrast of the Solar EUV Network |
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Authors: | K P Raju |
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Institution: | (1) ESA Space Science Department, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA; |
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Abstract: | Intensity distributions of the EUV network and the cell interior in the solar atmosphere have been obtained in fourteen emission
lines from Solar and Heliospheric Observatory (SOHO)/Coronal Diagnostic Spectrometer (CDS) observations. The formation temperature of the observed lines is in the range
log T=4.90 – 6.06 (T in Kelvin), and hence they represent increasing heights in the solar atmosphere from the upper chromosphere and the transition
region to the low corona. Intensity distributions of the cell interior have been found to be different in the quiet Sun and
the coronal hole even at the lower transition region, which is at variance with some earlier results. The intensity contrast
of the network with respect to the cell interior has been obtained for each line, and differences in the quiet Sun and the
coronal hole have been examined. The network contrast, in general, is lower for the coronal hole as compared to the quiet
Sun, but becomes equal to it in the upper transition region. The maximum contrast for both the regions is at about log T=5.3. Also obtained are the relative contributions of the network and the cell interior to the total intensity. The implications
of the results for models of the transition region are briefly mentioned. |
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Keywords: | |
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