Mathematics – Logic
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..489m&link_type=abstract
8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel
Mathematics
Logic
Scientific paper
The magnetic field plays a vital role in governing the size, shape and dynamics of loops in the solar atmosphere and as such it seems reasonable to ask whether differences in the spatial distribution of these structures are indicative of differences in the form of the heating. Using observations from the Coronal Diagnostic Spectrometer (CDS) on SoHO and the Soft X-ray Telescope (SXT) on Yohkoh we investigate how the spatial distribution of EUV and X-ray emission in active regions varies with temperature. We examine various correlations between emission at different temperatures, the variation of contrast with temperature and employ Fourier methods to obtain the two dimensional power spectrum of the intensity distribution for a number of lines at different temperatures. Integrating this over polar angle we find isotropic power-law behaviour at all temperatures in a number of topologically different active regions, with a tendency for flatter spectra at lower temperatures. The existence of power-law spectra indicates that there is no preferred length scale within the regions. Flatter spectra at lower temperatures are consistent with emission predominantly from smaller scale structures such as low-lying loops or footpoints.
Harra-Murnion Louise K.
Klimchuk James A.
Matthews Sarah A.
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