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Space Science Reviews

, 159:225 | Cite as

The Relationship Between Solar Radio and Hard X-ray Emission

  • S. M. WhiteEmail author
  • A. O. Benz
  • S. Christe
  • F. Fárník
  • M. R. Kundu
  • G. Mann
  • Z. Ning
  • J.-P. Raulin
  • A. V. R. Silva-Válio
  • P. Saint-Hilaire
  • N. Vilmer
  • A. Warmuth
Article

Abstract

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.

Keywords

Sun: radio radiation Sun: X-rays Sun: flares Sun: energetic particles 

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Copyright information

© US Government 2011

Authors and Affiliations

  • S. M. White
    • 1
    • 5
    Email author
  • A. O. Benz
    • 2
  • S. Christe
    • 3
  • F. Fárník
    • 4
  • M. R. Kundu
    • 5
  • G. Mann
    • 6
  • Z. Ning
    • 7
  • J.-P. Raulin
    • 8
  • A. V. R. Silva-Válio
    • 8
  • P. Saint-Hilaire
    • 9
  • N. Vilmer
    • 10
  • A. Warmuth
    • 6
  1. 1.Space Vehicles Directorate, AFRLKirtland AFBAlbuquerqueUSA
  2. 2.Institute of AstronomyETH ZürichZürichSwitzerland
  3. 3.NASA/Goddard Space Flight CenterGreenbeltUSA
  4. 4.Astronomical InstituteAcademy of SciencesOndřejovCzech Republic
  5. 5.Dept. of AstronomyUniversity of MarylandCollege ParkUSA
  6. 6.Astrophysikalisches Institut PotsdamPotsdamGermany
  7. 7.Purple Mountain ObservatoryNanjingChina
  8. 8.Centro de Radio Astronomia e Astrofisica MackenzieSão PauloBrazil
  9. 9.Space Sciences LaboratoryUniversity of CaliforniaBerkeleyUSA
  10. 10.Observatoire de ParisLESIA—CNRS UMR 8109MeudonFrance

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