Solar Physics

, Volume 100, Issue 1–2, pp 465–490

Solar hard X-ray bursts

  • Brian R. Dennis
Article

Abstract

The major results from SMM are presented as they relate to our understanding of the energy release and particle transportation processes that lead to the high-energy X-ray aspects of solar flares. Evidence is reviewed for a 152–158 day periodicity in various aspects of solar activity including the rate of occurrence of hard X-ray and gamma-ray flares. The statistical properties of over 7000 hard X-ray flares detected with the Hard X-Ray Burst Spectrometer are presented including the spectrum of peak rates and the distribution of the photon number spectrum. A flare classification scheme introduced by Tanaka is used to divide flares into three different types. Type A flares have purely thermal, compact sources with very steep hard X-ray spectra. Type B flares are impulsive bursts which show double footpoints in hard X-rays, and soft-hard-soft spectral evolution. Type C flares have gradually varying hard X-ray and microwave fluxes from high altitudes and show hardening of the X-ray spectrum through the peak and on the decay. SMM data are presented for examples of type B and type C events. New results are presented showing coincident hard X-rays, O v, and UV continuum observations in type B events with a time resolution of ≤128 ms. The subsecond variations in the hard X-ray flux during ≲ 10% of the stronger events are discussed and the fastest observed variation in a time of 20 ms is presented. The properties of type C flares are presented as determined primarily from the non-imaged hard X-ray and microwave spectral data. A model based on the association of type C flares and coronal mass ejections is presented to explain many of the characteristics of these gradual flares.

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References

  1. Acton, L. W., Culhane, J. L., Gabriel, A. H., and 21 co-authors: 1980, Solar Phys. 65, 53.Google Scholar
  2. Antonucci, E., Gabriel, A. H., and Dennis, B. R.: 1984, Astrophys. J. 287, 179.Google Scholar
  3. Bai, T.: 1982, in R. E. Lingenfelter, H. S. Hudson, and D. M. Worrall (eds.), Gamma Ray Transients and Related Astrophysical Phenomena, American Institute of Physics, New York, p. 409.Google Scholar
  4. Bai, T. and Dennis, B. R.: 1985, Astrophys. J. 292, 699.Google Scholar
  5. Bai, T. and Ramaty, R.: 1979, Astrophys. J. 227, 1072.Google Scholar
  6. Bai, T., Hudson, H. S., Pelling, R. M., Lin, R. P., Schwartz, R. A., and von Rosenvinge, T. T.: 1983, Astrophys. J. 267, 433.Google Scholar
  7. Bai, T., Kiplinger, A. L., and Dennis, B. R.: 1985, Astrophys. J. (in preparation).Google Scholar
  8. Batchelor, D. A.: 1984, Ph.D. Thesis, University of North Carolina at Chapel Hill; also NASA TM86102.Google Scholar
  9. Bogert, R. S. and Bai, T.: 1985, presented at the Solar Physics Division meeting Tucson, May 13–15, 1985.Google Scholar
  10. Brown, J. C.: 1971, Solar Phys. 18, 489.Google Scholar
  11. Cheng, C.-C., Tandberg-Hanssen, E., Bruner, E. C., Orwig, L. E., Frost, K. J., Woodgate, B. E., and Shine, R. A.: 1981, Astrophys. J. 248, L39.Google Scholar
  12. Cliver, E. W.: 1983, Solar Phys. 84, 347.Google Scholar
  13. Cliver, E. W., Dennis, B. R., Kane, S. R., Neidig, D. F., Sheeley, N. R. Jr., and Koomen, M. J.: 1985, Astrophys. J. (submitted).Google Scholar
  14. Cook, J. W. and Brueckner, G. E.: 1979, Astrophys. J. 227, 645.Google Scholar
  15. Crannell, C. J., Frost, K. J., Mätzler, C., Ohki, K., and Saba, J. L.: 1978, Astrophys. J. 223, 620.Google Scholar
  16. Datlowe, D. W.: 1975, Space Sci. Instr. 1, 389.Google Scholar
  17. Datlowe, D. W.: 1977, Nucl. Inst. Methods 145, 365.Google Scholar
  18. Datlowe, D. W., Elcan M. J., and Hudson, H. S.: 1974, Solar Phys. 39, 155.Google Scholar
  19. Deeming, T. J.: 1975, Astrophys. Space Sci. 36, 137.Google Scholar
  20. Dennis, B. R., Frost, K. J., and Orwig, L. E.: 1981, Astrophys. J. 244, L167.Google Scholar
  21. Dennis, B. R., Frost, K. J., Orwig, L. E., Kiplinger, A. L., Dennis, H. E., Gibson, B. R., Kennard, G. S., and Tolbert, A. K.: 1983, NASA TM84998.Google Scholar
  22. Dennis, B. R., Kiplinger, A. L., Orwig, L. E., and Frost, K. J.: 1985, Proc. 2nd India-U.S. Workshop on Solar Terrestrial Physics, January 1984, New Delhi, India; also NASA TM86187.Google Scholar
  23. Donnelly, R. F. and Kane, S. R.: 1978, Astrophys. J. 222, 1043.Google Scholar
  24. Duijveman, A. and Hoyng, P.: 1983, Solar Phys. 86, 289.Google Scholar
  25. Duijveman, A., Hoyng, P., and Machado, M. E.: 1982, Solar Phys. 81, 137.Google Scholar
  26. Emslie, A. G. and Nagai, F.: 1984, Astrophys. J. 279, 896.Google Scholar
  27. Emslie, A. G. and Vlahos, L.: 1980, Astrophys. J. 242, 359.Google Scholar
  28. Hoyng, P., Marsh, K. A., Zirin, H., and Dennis, B. R.: 1983, Astrophys. J. 268, 865.Google Scholar
  29. Hurley, K., Niel, M., Talon, R., Estulin, I. V., and Dolidge, V. Ch.: 1983, Solar Phys. 86, 367.Google Scholar
  30. Kahler, S. W.: 1982, J. Geophys. Rev. 87, 3439.Google Scholar
  31. Kane, S. R.: 1973, in R. Ramaty and R. G. Stone (eds.), High Energy Phenomena in the Sun, NASA SP-342, p. 55.Google Scholar
  32. Kane, S. R. and Anderson, K. A.: 1970, Astrophys. J. 162, 1003.Google Scholar
  33. Kane, S. R., Frost, K. J., and Donnelly, R. F.: 1979, Astrophys. J. 234, 669.Google Scholar
  34. Kawabata, K., Ogawa, H., and Suzuki, I.: 1983, Solar Phys. 86, 247.Google Scholar
  35. Kiplinger, A. L., Dennis, B. R., Emslie, A. G., Frost, K. J., and Orwig, L. E.: 1983a, Astrophys. J. 265, L99.Google Scholar
  36. Kiplinger, A. L., Dennis, B. R., Frost, K. J., and Orwig, L. E.: 1983b, Astrophys. J. 273, 783.Google Scholar
  37. Kiplinger, A. L., Dennis, B. R., Frost, K. J., and Orwig, L. E.: 1984, Astrophys. J. 287, L105.Google Scholar
  38. Kiplinger, A. L., Dennis, B. R., and Orwig, L. E.: 1985, Bull. Am. Astron. Soc. 16, 891.Google Scholar
  39. Leach, J. and Petrosian, V.: 1983, Astrophys. J. 269, 715.Google Scholar
  40. Lin, R. P. and Hudson, H. S.: 1976, Solar Phys. 50, 153.Google Scholar
  41. Lin, R. P., Schwartz, R. A., Kane, S. R., Pelling, R. M., and Hurley, K. C.: 1984, Astrophys. J. 283, 421.Google Scholar
  42. Lin, R. P., Schwartz, R. A., Pelling, R. M., and Hurley, K. C.: 1981, Astrophys. J. 251, L109.Google Scholar
  43. MacKinnon, A. L., Brown, J. C., and Hayward, J.: 1984, preprint.Google Scholar
  44. Mariska, J. T. and Poland, A. I.: 1985, Solar Phys. 96, 317.Google Scholar
  45. Ohki, K., Takakura, T., Tsunata, S., and Nitta, N.: 1983, Solar Phys. 86, 301.Google Scholar
  46. Orwig, L. E., Frost, K. J., and Dennis, B. R.: 1981, Astrophys. J. 244, L163.Google Scholar
  47. Pallavicini, R., Serio, S., and Vaiana, G. S.: 1977, Astrophys. J. 216, 108.Google Scholar
  48. Poland, A. I., Machado, M. E., Wolfson, C. J., Frost, K. J., Woodgate, B. E., Shine, R. A., Kenny, P. J., Cheng, C.-C., Tandberg-Hanssen, E. A., Bruner, E. C., and Henze, W.: 1982, Solar Phys. 78, 201.Google Scholar
  49. Poland, A. I., Orwig, L. E., Mariska, J. T., Nakatsuka, R., and Auer, L. H.: 1985, Astrophys. J. 280, 457.Google Scholar
  50. Pryor, H., Pierce, M. J., Speich, D. M., Fesq, L. M., Spear, K. A., Nelson, J. J., and McGovern, J. G.: 1981, Solar Maximum Mission Event Listing, Internal Document of the SMM Data Analysis Center, NASA, GSFC.Google Scholar
  51. Rieger, E., Share, G. H., Forrest, D. J., Kanback, G., Reppin, C., and Chupp, E. L.: 1985, Nature 312, 623.Google Scholar
  52. Rust, D. M.: 1984, Adv. Space Res. 4, 191.Google Scholar
  53. Rust, D. M., Simnett, G. M., and Smith, D. F.: 1985, Astrophys. J. 288, 401.Google Scholar
  54. Smith, D. F.: 1985, Astrophys. J. 288, 801.Google Scholar
  55. Švestka, Z., Schrijver, J., Somov, B., Dennis, B. R., Woodgate, B. E., Fürst, E., Hirth, W., Klein, L., and Raoult, A.: 1983, Solar Phys. 85, 313.Google Scholar
  56. Tanaka, K., 1983, in P. B. Byrne and M. Rodono (eds.), ‘Activity in Red-Dwarf Stars’, IAU Colloq. 71, 307.Google Scholar
  57. Tanaka, K., Nitta, N., Akita, K., and Watanabe, T.: 1983, Solar Phys. 86, 91.Google Scholar
  58. Tramiel, L. J., Charan, G. A., and Novick, R.: 1984, Astrophys. J. 280, 440.Google Scholar
  59. Tsuneta, S.: 1983, in J.-C. Pecker and Y. Uchida (eds.), Proc. Japan-France Seminar on Active Phenomena in the Outer Atmosphere of the Sun and Stars, 3–7 October 1983, CNRS and Observatoire de Paris, p. 243.Google Scholar
  60. Tsuneta, S.: 1985, Astrophys. J. 290, 353.Google Scholar
  61. Tsuneta, S., Nitta, N., Ohki, K., Takakura, T., Tanaka, K., Makishima, K., Murakami, T., Oda, M., and Ogawara, Y.: 1984a, Astrophys. J. 284, 827.Google Scholar
  62. Tsuneta, S., Takakura, T., Nitta, N., Ohki, K., Tanaka, K., Makishima, K., Murakami, T., Oda, M., Ogawara, Y., and Kondo, I.: 1984b, Astrophys. J. 280, 887.Google Scholar
  63. Tucker, W. H.: 1975, Radiation Processes in Astrophysics, MIT Press, Cambridge.Google Scholar
  64. Wolff, C. L.: 1983, Astrophys. J. 264, 667.Google Scholar
  65. Woodgate, B. E.: 1984, Adv. Space Res. 4, 393.Google Scholar
  66. Woodgate, B. E., Shine, R. A., Poland, A. I., and Orwig, L. E.: 1983, Astrophys. J. 265, 530.Google Scholar
  67. Wu, S. T., de Jager, C., Dennis, B. R., Hudson, H. S., Simnett, G. M., Strong, K. T., Bentley, R. D., Bornmann, P. L., Bruner, M. E., Cargill, P. J., Crannell, C. J., Doyle, J. G., Hyder, C. L., Kopp, R. A., Lemen, J. R., Martin, S. F., Pallavicini, R., Peres, G., Serio, S., Sylvester, J., and Veck, N. J.: 1985, in M. R. Kundu and B. E. Woodgate (eds.), Proc. SMM Workshop on Solar Flares, NASA, (in preparation).Google Scholar

Copyright information

© D. Reidel Publishing Company 1985

Authors and Affiliations

  • Brian R. Dennis
    • 1
  1. 1.Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight CenterGreenbeltU.S.A.

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