Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986epos.conf..4.1d&link_type=abstract
In NASA. Goddard Space Flight Center Energetic Phenomena on the Sun: The Solar Maximum Mission Flare Workshop. Proceedings 42 p
Physics
Chromosphere, Explosions, Plasma Heating, Solar Corona, Solar Flares, Solar Physics, Solar X-Rays, Sun, Electron Beams, Solar Electrons, Solar Maximum Mission, Solar Spectra, Spectrometers, Ultraviolet Radiation
Scientific paper
Three issues relative to chromospheric explosions were debated. (1) Resolved: The blue-shifted components of x-ray spectral lines are signatures of chromospheric evaporation. It was concluded that the plasma rising with the corona is indeed the primary source of thermal plasma observed in the corona during flares. (2) Resolved: The excess line broading of UV and X-ray lines is accounted for by a convective velocity distribution in evaporation. It is concluded that the hypothesis that convective evaporation produces the observed X-ray line widths in flares is no more than a hypothesis. It is not supported by any self-consistent physical theory. (3) Resolved: Most chromospheric heating is driven by electron beams. Although it is possible to cast doubt on many lines of evidence for electron beams in the chromosphere, a balanced view that debaters on both sides of the question might agree to is that electron beams probably heat the low corona and upper chromosphere, but their direct impact on evaporating the chromosphere is energetically unimportant when compared to conduction. This represents a major departure from the thick-target flare models that were popular before the Workshop.
Antiochos Spiro K.
Antonucci Ester
Cheng Chung-Chieh
Culhane Leonard J.
Doschek George A.
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