The Relationship Between Solar Radio and Hard X-ray Emission
Space Science Reviews(2011)
摘要
This review discusses the complementary relationship between radio and hard X-ray observations of the Sun using primarily
results from the era of the Reuven Ramaty High Energy Solar Spectroscopic Imager satellite. A primary focus of joint radio and hard X-ray studies of solar flares uses observations of nonthermal gyrosynchrotron
emission at radio wavelengths and bremsstrahlung hard X-rays to study the properties of electrons accelerated in the main
flare site, since it is well established that these two emissions show very similar temporal behavior. A quantitative prescription
is given for comparing the electron energy distributions derived separately from the two wavelength ranges: this is an important
application with the potential for measuring the magnetic field strength in the flaring region, and reveals significant differences
between the electrons in different energy ranges. Examples of the use of simultaneous data from the two wavelength ranges
to derive physical conditions are then discussed, including the case of microflares, and the comparison of images at radio
and hard X-ray wavelengths is presented. There have been puzzling results obtained from observations of solar flares at millimeter
and submillimeter wavelengths, and the comparison of these results with corresponding hard X-ray data is presented. Finally,
the review discusses the association of hard X-ray releases with radio emission at decimeter and meter wavelengths, which
is dominated by plasma emission (at lower frequencies) and electron cyclotron maser emission (at higher frequencies), both
coherent emission mechanisms that require small numbers of energetic electrons. These comparisons show broad general associations
but detailed correspondence remains more elusive.
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关键词
Sun: radio radiation,Sun: X-rays,Sun: flares,Sun: energetic particles
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