Solar Physics

, Volume 18, Issue 2, pp 284–304 | Cite as

On the origin of solar flare X-rays

  • A. A. Korchak


The origin of X-ray solar bursts is investigated on the basis of the theoretical model developed by Syrovatskii. According to this model (i) one of the most important manifestations of flares is the acceleration of charged particles (mainly of electrons) to subrelativistic and relativistic energies, and (ii) the two flare phases: stationary (soft) and nonstationary (hard) should be distinguished. The first phase is accompanied by the generation of the soft (2–8 Å) thermal X-rays and the second one by the generation of hard thermal and nonthermal X-rays in the ⩾10 keV range. The thermal X-rays arise in both phases due to the heating of the ambient gas by accelerated particles. The possible mechanisms of non-thermal X-rays are investigated. Simple models of the emitting region are considered, taking into account the simultaneous observations in different regions of the electromagnetic spectrum.


Theoretical Model Flare Simple Model Charged Particle Relativistic Energy 
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  1. Ahiezer, A. I. and Berestetskii, V. B.: 1950, Kvantovaja Elektrodinamika, Moscow.Google Scholar
  2. Arnoldy, R. L., Kane, S. R., and Winckler, J. R.: 1967, Solar Phys. 2, 171.Google Scholar
  3. Chiuderi, C. and Chiuderi, F. D.: 1967, Nuovo Cimento 58, 186.Google Scholar
  4. Chubb, T. A., Kreplin, R. W., and Friedman, H.: 1966, J. Geophys. Res. 71, 3611.Google Scholar
  5. Cox, D. P. and Tucker, W. H.: 1969, Astrophys. J. 157, 1157.Google Scholar
  6. Culhane, J. L. and Phillips, K. J. H.: 1970, Solar Phys. 11, 117.Google Scholar
  7. De Jager, C.: 1967, Solar Phys. 2, 347.Google Scholar
  8. Dolan, I. F.: 1965, Astron. J. 70, 137.Google Scholar
  9. Dolginova, J. N. and Korchak, A. A.: 1968, Soln. Dann. No. 5, 99.Google Scholar
  10. Elwert, G.: 1939, Ann. Phys. Paris, 34, 178.Google Scholar
  11. Elwert, G.: 1968, in K. O. Kiepenheuer (ed.), ‘Structure and Development of Solar Active Regions’, IAU Symp. 35, 444.Google Scholar
  12. Frost, K. J.: 1969, Astrophys. J. 158, L 159.Google Scholar
  13. Ginzburg, V. L. and Syrivatskii, S. I.: 1966, Origin of Cosmic Rays, Macmillan & Co., New York.Google Scholar
  14. Glückstern, R. L., Hill, M. H., and Breit, G.: 1953, Phys. Rev. 90, 1030.Google Scholar
  15. Gopasjuk, S. I., Erushev, N. N., and Neshpor, Ju. N.: 1969, Izv. Krymsk. Astrofiz. Observ. 39, 299.Google Scholar
  16. Heitler, W.: 1954, The Quantum Theory of Radiation, Oxford.Google Scholar
  17. Holt, S. S. and Ramaty, E.: 1969, Solar Phys. 8, 115.Google Scholar
  18. Hudson, H. S., Peterson, L. E., and Schwartz, D. A.: 1969, Solar Phys. 6, 205.Google Scholar
  19. Kane, S. R.: 1969, Astrophys. J. 158, L 139.Google Scholar
  20. Ken. Ichiro-Ohki: 1969, Solar Phys. 7, 260.Google Scholar
  21. Korchak, A. A.: 1965a, Geomagnetizm i Aeronomiya 5, 601.Google Scholar
  22. Korchak, A. A.: 1965b, Geomagnetizm i Aeronomiya 5, 32; Kosmich. Issled. 5, 751.Google Scholar
  23. Korchak, A. A.: 1967a, Astron. Zh. 44, 328.Google Scholar
  24. Korchak, A. A.: 1967b, Nature 213, 1209.Google Scholar
  25. Korchak, A. A.: 1967c, Dokl. Akad. Nauk. S.S.S.R. 173, 291.Google Scholar
  26. Korchak, A. A.: 1968, Doct. Dissertation, Moscow State University.Google Scholar
  27. Korchak, A. A.: 1969, Proceedings of the International Symposium on Solar-Terrestrial Physics, Crimean Astrophysical Observatory, October, 1968, Moscow, p. 20.Google Scholar
  28. Korchak, A. A. and Platov, J. V.: 1968, Astron. Zh. 45, 1185.Google Scholar
  29. Korchak, A. A. and Ponomarenko, J. B.: 1966, Geomagnetizm i Aeronomiya 6, 417.Google Scholar
  30. Kundu, M. R.: 1963, Space Sci. Rev. 2, 346.Google Scholar
  31. Parks, G. K. and Winckler, J. R.: 1969, Astrophys. J. 155, L 117.Google Scholar
  32. Petchek, H. E.: 1964, in W. Hess (ed.), AAS-NASA Symposium on the Physics of Solar Flares, NASA SP-50, 425.Google Scholar
  33. Pinter, S.: 1969, Solar Phys. 8, 142.Google Scholar
  34. Platov, J. V.: 1971, Geomagnetizm i Aeronomiya (in press).Google Scholar
  35. Pottasch, S. R.: 1965, Bull. Astron. Inst. Neth. 18, 7.Google Scholar
  36. Shmeleva, O. P. and Nikolskii, G. M.: 1971, Astron. Zh. (in press).Google Scholar
  37. Snijders, R.: 1968, Solar Phys. 4, 432.Google Scholar
  38. Stein, W. A. and Ney, E. P.: 1963, J. Geophys. Res. 68, 65.Google Scholar
  39. Švestka, Z.: 1966, Space Sci. Rev. 5, 388.Google Scholar
  40. Švestka, Z. and Simon, P.: 1969, Solar Phys. 10, 3.Google Scholar
  41. Sweet, P. A.: 1958, Nuovo Cimento Suppl. 8, 188.Google Scholar
  42. Syrovatskii, S. I.: 1966, Astron. Zh. 43, 340.Google Scholar
  43. Syrovatskii, S. I.: 1969, in C. de Jager and Z. Švestka (eds.), ‘Solar Flares and Space Research’, COSPAR Symp. 155.Google Scholar
  44. Syrovatskii, S. I.: 1970, Invited Review Paper at the COSPAR XIII, U.S.S.R., Leningrad.Google Scholar
  45. Syrovatskii, S. I. and Shmeleva, O. P.: 1971, Astron. Zh. (in press).Google Scholar
  46. Takakura, T.: 1967, Solar Phys. 1, 304.Google Scholar
  47. Takakura, T. and Kai, K.: 1966, Publ. Astron. Soc. Japan 18, 57.Google Scholar
  48. Teske, R. G.: 1969, Solar Phys. 6, 193.Google Scholar
  49. Teske, R. G. and Thomas, R. J.: 1969, Solar Phys. 8, 348.Google Scholar
  50. Tindo, I. P., Ivanov, V. D. Mandelstam, S. L., and Shuryghin, A. I.: 1970, Solar Phys. 14, 204.Google Scholar
  51. Vorpahl, J. and Zirin, H.: 1970, Solar Phys. 11, 285.Google Scholar
  52. Westfold, K. C.: 1959, Astrophys. J. 130, 241.Google Scholar
  53. Zirin, H., Ingham, W., Hudson, H., and McKenzie, D.: 1969, Solar Phys. 9, 269.Google Scholar

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© D. Reidel Publishing Company 1971

Authors and Affiliations

  • A. A. Korchak
    • 1
  1. 1.Institute of Terrestrial Magnetism, Ionosphere and Radio-Wave Propagation of the U.S.S.R. Academy of SciencesMoscowU.S.S.R.

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