Abstract
Examination of X-ray images obtained by the S-054 X-ray spectrographic telescope on Skylab shows the presence of some atypical X-ray emitting coronal structures in active regions which are not consistent with potential extrapolations of photospheric magnetic fields. Analysis of the observed temporal changes in the X-ray emitting active region structures demonstrates that the majority of these consist of brightness changes representing temperature (and perhaps, density) variations of the material in the loops.
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