Interrelation of soft and hard X-ray emissions during solar flares. I - Observations

Details Interrelation of soft and hard X-ray emissions during solar flares. I - Observations Interrelation of soft and hard X-ray emissions during solar flares. I - Observations

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...375..366w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 375, July 1, 1991, p. 366-381.

Astronomy and Astrophysics

Astrophysics

25

Particle Acceleration, Solar Flares, Solar Spectra, Solar X-Rays, X Ray Spectra, Chromosphere, Doppler Effect, Solar Maximum Mission, Spectral Energy Distribution

Scientific paper

The interrelation between the acceleration and heating of electrons and ions during impulsive solar flares is determined on the basis of simulataneous observations of hard and soft X-ray emission from the Solar Maximum Mission at high time resolution (6 s). For all the flares, the hard X-rays are found to have a power-law spectrum which breaks down during the rise phase and beginning of the decay phase. After that, the spectrum changes to either a single power law or a power law that breaks up at high energies. The characteristics of the soft X-ray are found to depend on the flare position. It is suggested that small-scale quasi-static electric fields are important for determining the acceleration of the X-ray-producing electrons and the outflowing chromospheric ions.

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