Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...85..243b&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 85, June 1983, p. 243-265.
Astronomy and Astrophysics
Astronomy
16
Extreme Ultraviolet Radiation, Fine Structure, Line Spectra, Noise Storms, Solar Corona, Ultraviolet Spectra, Coronal Loops, Solar Limb, Solar Magnetic Field, Spaceborne Astronomy
Scientific paper
Fe XV (284-A, 2-MK) images obtained with the NRL slitless spectroheliograph aboard Skylab in 1973 and 1974 are presented and analyzed in comparison to published magnetic-noise-storm and sunspot data. The observing periods are subdivided into storm or no-storm periods and discussed individually in terms of coronal structures. It is found that all type-I noise storms observed were associated with newly emerging flux and changes in the structure of the coronal magnetic field, while quiet periods showed stable coronal features with no emerging flux, at least in the vicinity of existing active regions. It is inferred that type-I storms are caused by large-scale changes in the coronal magnetic field connecting different active regions, and that coronal arches must attain a certain size to affect the surrounding magnetic-field structure. It is also shown that the Fe XV loops are not in hydrostatic equilibrium, since densities such as 1.3 x 10 to the 9th per cu cm are observed over a wide range of altitudes.
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