The extreme-ultraviolet spectrum of a solar impulsive burst

Details The extreme-ultraviolet spectrum of a solar impulsive burst The extreme-ultraviolet spectrum of a solar impulsive burst

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..835w&link_type=abstract

Astrophysical Journal, Part 1, vol. 258, July 15, 1982, p. 835-845.

Astronomy and Astrophysics

Astrophysics

20

Emission Spectra, Extreme Ultraviolet Radiation, Line Spectra, Solar Flares, Solar Spectra, Ultraviolet Spectra, Bursts, Helium, Iron, Nitrogen, Oxygen Spectra, Silicon, Skylab Program, Solar Temperature, Spectroheliographs, Temperature Gradients

Scientific paper

The spectrum of the Dec. 22, 1973 flare in the 170-345 A range is examined as an example of a class of impulsive EUV events observed with the NRL spectroheliograph on Skylab. The spectrum shows strongly enhanced emission of He II and transition-zone ions; and a number of new solar identifications of N IV, O IV, and O V are given. The transition-zone emission measure shows an unusually flat slope varying as T to the 0.8 power. The EUV emission has a fine-scale structure of the order of 2 km in O IV and O V, and 60 km in Fe IX and Si X. The unresolved fine structure could represent a collection of filaments or, alternatively, thin layers produced by sharp temperature gradients along a loop.

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