What produces the high densities observed in solar flare plasmas

Details What produces the high densities observed in solar flare plasmas What produces the high densities observed in solar flare plasmas

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..210c&link_type=abstract

Astronomy and Astrophysics, vol. 97, no. 1, Apr. 1981, p. 210-212.

Astronomy and Astrophysics

Astrophysics

7

Dense Plasmas, Magnetic Field Reconnection, Plasma Density, Plasma Heating, Solar Flares, Solar Wind, Chromosphere, Coronal Loops, Density Measurement, Plasma Radiation, Solar Magnetic Field, Solar Temperature, Solar X-Rays

Scientific paper

Attention is drawn to the implications of the high densities observed in flare plasmas in the wide temperature range from 10 to the 4th K to more than 10 to the 7th K. The chromospheric evaporation theory for the decay phase is discussed, and it is found that it is not consistent with the observations. It is pointed out that all the flare mechanisms proposed so far, e.g., magnetic field reconnection in various geometries, have entirely ignored the fundamental problem of how the high densities arise in the first place, and, in fact, they are unable to answer this question. It is suggested that compressional heatings of a flaring loop might be responsible for the density and emission measure (EM) increases observed in flare plasmas. Chromospheric evaporation associated with local heating in the initial rising phase of the flare, in distinction to the existing evaporation theory which assumes a coronal heating source, is also discussed. Possible observational tests, utilizing the newly launched Solar Maximum Mission (SMM) satellite, are presented.

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