Observation of nonthermal energy distributions during the impulsive phase of solar flares

Details Observation of nonthermal energy distributions during the impulsive phase of solar flares Observation of nonthermal energy distributions during the impulsive phase of solar flares

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..541s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 541-554. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

31

Electron Energy, Energy Distribution, Solar Flares, Solar X-Rays, X Ray Spectra, Electronic Spectra, Iron, Resonance Fluorescence, Solar Spectrometers, Time Dependence

Scientific paper

The Fe XXV resonance line and dielectronic satellite intensities have been measured as functions of time for several flares recorded by the Naval Research Laboratory crystal spectrometer (SOLFLEX) flown on the US Air Force P78-I spacecraft. The intensity ratios of the Fe XXV resonance line, the Fe XXIV n = 2 satellite line j, and the Fe XXIV n = 3 satellite line d13 indicate that nonthermal electron energy distributions occur during the impulsive phase of the flares. For the electron energies at which the j and d13 satellites are formed (4.7 and 5.8 keV, respectively), the electron energy distributions during the impulsive phase are observed to have a bump or to be nearly flat. For all of the flares that were studied, hard X-ray bursts occurred near the time of the nonthermal distributions observed in the SOLFLEX data.

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