Physics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...89..341l&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 89, Dec. 1983, p. 341-353. Research supported by the California State University Foundation
Physics
Emission Spectra, Line Spectra, Magnesium, Solar Flares, Solar Spectra, Cross Correlation, Filtergrams, Morphology, Photosphere, Visible Spectrum
Scientific paper
Observations of emission in the Mg I b2 line at 5172 A are presented for 13 flares. Also discussed are three flares which occurred in regions under observation but which showed no Mg emission. The Mg flare kernels resemble white light flare kernels in their general morphology and location. Comparison of Mg filtergrams with magnetograms indicates that the Mg kernels occur at the feet of magnetic arches across neutral lines. Time-lapse Mg filtergram films indicate photospheric shearing motions near flare sites for several hours before flare onset. Flare Mg emission has been compared with microwave and both hard and soft X-ray flare emissions. Examination at the time development of the July 27, 1981, flare shows that the microwave and X-ray bursts may be clearly related to the appearance of successive Mg flare kernels. Subjective, relative Mg flare importances are also compared with other flare emission measurements. For the full sample of flares, Mg importance is significantly correlated with hard and soft X-ray emission peaks, with X-ray 'hardness' (ratio of hard to soft peaks) and with the rise slope of soft X-bursts. The Mg importance does not correlate with the microwave peaks when the full sample of flares is used, but for the subset showing Mg emission there is significant correlation. No correlation with H-alpha importance was found. Present results suggest that Mg emission is associated with an impulsive component which may be absent from some flares. The San Fernando Observatory magnesium etalon filter system is described.
Chapman Gary A.
Herzog A. D.
Lawrence John K.
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