Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223.1058m&link_type=abstract
Astrophysical Journal, Part 1, vol. 223, Aug. 1, 1978, p. 1058-1061, 1063, 1065-1071.
Astronomy and Astrophysics
Astrophysics
78
High Temperature Plasmas, Plasma Heating, Solar Flares, X Ray Spectra, Adiabatic Conditions, H Alpha Line, Microwave Emission, Photosphere, Solar Radio Emission, Solar X-Rays
Scientific paper
A study is made of adiabatic heating in two impulsive solar flares on the basis of dynamic X-ray spectra in the 28-254 keV range, H-alpha, microwave, and meter-wave radio observations. It is found that the X-ray spectra of the events are like those of thermal bremsstrahlung from single-temperature plasmas in the 10-60 keV range if photospheric albedo is taken into account. The temperature-emission correlation indicates adiabatic compression followed by adiabatic expansion and that the electron distribution remains isotropic. H-alpha data suggest compressive energy transfer. The projected areas and volumes of the flares are estimated assuming that X-ray and microwave emissions are produced in a single thermal plasma. Electron densities of about 10 to the 9th/cu cm are found for homogeneous, spherically symmetric sources. It is noted that the strong self-absorption of hot-plasma gyrosynchrotron radiation reveals low magnetic field strengths.
Bai Taeil
Crannell Carol J.
Frost Kenneth J.
Maetzler C.
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