Abstract
The time profiles of electromagnetic fluxes at hard X-rays and short microwaves are signatures of the energy conversion mechanisms at the origin of solar flares. The distinction between continuum and discrete energy production brings drastic conceptual consequences for the interpretation of the energy conversion processes. As more sensitive detectors were used on measurements with higher time resolution, the notion of continuum energy release in the impulsive phase is being replaced by the concept of repetitive energy production or Elementary Flare Bursts manifested at hard X-rays and by rapid time structures in microwave emissions. These discrete time structures are now known to be as short as tens of milliseconds, and part of their emissions are possibly produced by the same populations of accelerated electrons. Fast spikes, with mm-wave emission fluxes increasing for shorter wavelengths, simultaneous with hard X-rays, bring severe constraints for interpretation. This problem is reviewed, with the suggestion of a possible significant burst emission component in the sub-mm-IR range, due to primeval short-lived explosive compact sources, for which there are still no diagnostics.
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Acton, L. W.: 1974, Nature 204, 64.
Akabane, K., Nakajima, H., Ohki, M., Moriyama, F., and Miyaji, T.: 1973, Solar Phys. 33, 431.
Allaart, M. A. F., van Nieuwkoop, J., Slottje, C., and Sondaar, L. H.: 1990, Solar Phys. 130, 193.
Aschwanden, M. J., Benz, A. O., and Schwartz, R. A.: 1993, Astrophys. J. 417, 790.
Benz, A. O.: 1993, Plasma Astrophysics: Kinetic Processes in Solar and Stellar Coronae, Kluwer Academic Publishers, Dordrecht, Holland, p. 10.
Benz, A. O.: 1994, Space Sci. Rev. 68, 135.
Benz, A. O., Su, H., Magun, A., and Stahling, K.: 1992, Astron. Astrophys. 93, 539.
Boischot, A.: 1967, Ann. Astrophys. 30, 85.
Brown, J. C.: 1976, Trans. Roy. Soc. London A291, 473.
Brown, J. C. and Smith, D. F.: 1980, Rep. Progr. Phys. 43, 125.
Brown, J. C., Craig, J. D., and Karpen, J. T.: 1980, Solar Phys. 67, 143.
Charikov, Y. E., Kocharov, G. E., and Lazutkov, V. P.: 1981, 17th Int. Cosmic Ray conf., Paris.
Chertok, I. M., Fomichev, V. V., Gorgutsa, R. V., Hildebrandt, J., Krüger, A., Magun, A., and Zaitsev,V. V.: 1994, Solar Radio Bursts with a Spectra Flattening at Millimeter Wavelengths, presented at CESRA Workshop on Coronal Magnetic Energy Release, Postdam, Germany, 16–20 May.
Clark, C. D. and Park, W. M.: 1968, Nature 219, 922.
Cliver, E. W., Kahler, S. W., and McIntosh, A. S.: 1983, Astrophys. J. 264, 699.
Cogdell, J. R.: 1972, Solar Phys. 22, 147.
Correia, E.: 1983, MS Thesis, INPE, S.J. Campos, SP, Brazil.
Correia, E., Costa, J. E. R., Kaufmann, P., Magun, A., and Herrmann, R.: 1995, Solar Phys. 159, 143.
Costa, J. E. R., Kaufmann, P., and Takakura, T.: 1984, Solar Phys. 94, 369.
Croom, D. L: 1970, Solar Phys. 15, 414.
Croom, D. L.: 1973, in R. Ramaty and R. G. Stone (eds.), ‘Solar Millimeter-Wave Bursts’, High Energy Phenomena on the Sun, NASA/GSFC Symposium, September 28 – 30, 1972, Publ. NASA SP-342, p. 114.
de Jager, C.: 1986, Space Sci. Rev. 44, 43.
de Jager, C. and de Jonge, G.: 1978, Solar Phys. 58, 127.
de Jager, C., Kuperus, M., and Rosenberg, H.: 1976, Phil. Trans. Roy. Soc. London A281, 507.
de Jager, C., Kuijpers, J., Correia, E., and Kaufmann, P.: 1987, Solar Phys. 110, 317.
Dent, W. A., O'Dea, C. R, Balonek, T. J., Hobbs, R. W., and Howard, R. J.: 1983, Nature 306, 41.
Dröge, F.: 1961, Inf. Bull. Solar Radio Obs. 8.
Dröge, F.: 1977, Astron. Astrophys. 57, 285.
Emslie, A. G., Mehta, S., and Machado, M. E.: 1994, AGU-EOS Trans. 75, 295.
Forrest, D. J. and Chupp, E. L.: 1983, Nature 305, 291.
Frost, K. J.: 1969, Astrophys. J. 158, L159.
Ginzburg, V. L. and Syrovatskii, S. I.: 1965, Ann. Rev. Astron. Astrophys. 3, 297.
Gordon, I. M.: 1960, Soviet Astron. 4, 873.
Hachenberg, O. and Wallis, G.: 1961, Z. Astrophys. 52, 42.
Hudson, H. S.: 1972, Solar Phys. 24, 414.
Hurley, K., Niel, M., Talon, R., Estulin, I. V., and Dolidze, V. C.: 1983, Astrophys. J. 265, 1076.
Jones, T. W., O'Dell, S. L., and Stein, W. A.: 1974, Astrophys. J. 192, 261.
Kaufmann, P.: 1985, Solar Phys. 102, 97.
Kaufmann, P.: 1988, Adv. Space Res. 8 (11), 39.
Kaufmann, P., Piazza, L. R., and Raffaelli, J. C.: 1977, Solar Phys. 54, 179.
Kaufmann, P., Piazza, L. R., Schaal, R. E., and Iacomo, P., Jr.: 1978, Ann. Geophys. 34, 105.
Kaufmann, P., Strauss, F. M., Opher, R., and Laporte, C.: 1980, Astron. Astrophys. 87, 58.
Kaufmann, P., Strauss, F. M., Costa, J. E. R., Dennis, B. R., Kiplinger, A., Frost, K. J., and Orwig, L. E.: 1983, Solar Phys. 84, 311.
Kaufmann, P., Correia, E., Costa, J. E. R., Dennis, B. R., Hurford, G. J. and Brown, J. C.: 1984, Solar Phys. 91, 359.
Kaufmann, P., Correia, E., Costa, J. E. R., Zodi Vaz, A. M., and Dennis, B. R.: 1985, Nature 313, 380.
Kaufmann, P., Correia, E., Costa, J. E. R., and Zodi Vaz, A. M.: 1986, Astron. Astrophys. 157, 11.
Kaufmann, P., Parada, N. J., Magun, A., Rovira, M., Ghielmetti, H., and Levato, H.: 1994, Proc. Kofu Symposium ‘A new Look of the Sun’, 6–10 September, Kofu, Japan, NRO Report No. 360, July, 1994, p. 323.
Kellerman, K. I. and Pauliny-Toth, I. I. K.: 1969, Astrophys. J. 155, L71.
Kiplinger, A. L., Frost, K. J., and Orwig, L.E.: 1983, Solar Phys. 84, 311.
Kiplinger, A. L., Dennis, B. R., Emslie, A. G., Frost, K. J., and Orwig, L. E.: 1983, Astrophys. J. 265, L99.
Korchak, V. V.: 1971, Solar Phys. 18, 284.
Krüger, A., Kliem, B., Hildebrandt, J., and Zaitsev, V. V.: 1994, Astrophys. J. Suppl. 90, 683.
Kundu, M.R.: 1980, in M. R. Kundu and T. E. Gergely (eds.), ‘Radio Physics of the Sun’, IAU Symp. 86, 157.
Lim, J., White, S. W., Kundu, M. R., and Gary, D. E.: 1992, Solar Phys. 140, 343.
Loran, J. M., Brown, J. C., Correia, E., and Kaufmann, R: 1985, Solar Phys. 97, 363.
Lu, E. T. and Hamilton, R. J.: 1991, Astrophys. J. 380, L89.
Machado, M. E., Ong, K. K., Emslie, A. G., Fishman, G. J., Meegan, C., Wilson, R., and Paciesas, W.S.: 1993, Adv. Space Res. 13 (9), 175.
Masuda, S., Kosugi, T., Hara, H., Tsuneta, S., and Ogawara, Y.: 1994, Nature 371, 495.
McClements, K. G. and Brown, J. C.: 1996, Astron. Astrophys. 165, 235.
Nagita, K. and Orrall, F. W.: 1970, Solar Phys. 15, 176.
Neidig, D. F. and Cliver, E. W.: 1983, A Catalog of Solar White-Light Flares (1859 –1982), Including Their Statistical Properties and Associated Emissions, Rept. AFGL-TR-83-0257.
Ohki, K. and Hudson, H. S.: 1975, Solar Phys. 43, 405.
Parks, G. K. and Winckler, J. R.: 1969, Astrophys. J. 155, L117.
Ramaty, R.: 1973, in R. Ramaty and R. G. Stone (eds.), High Energy Phenomena on the Sun, NASA Publ. SP-342, p. 188.
Ramaty, R. and Petrosian, V.: 1972, Astrophys. J. 178, 241.
Shimabukuro, F. I.: 1970, Solar Phys. 15, 424.
Shimabukuro, F. I.: 1972, Solar Phys. 23, 169.
Shklovsky, J.: 1964, Nature 202, 275.
Slottje, C.: 1978, Nature 275, 520.
Spicer, D. S.: 1981, Solar Phys. 70, 149.
Stein, W. A. and Ney, E. P.: 1963, J. Geophys. Res. 68, 65.
Sturrock, P. A. and Uchida, Y.: 1981, Astrophys. J. 246, 331.
Sturrock, P. A., Kaufmann, P., Moore, R. L., and Smith, D. F.: 1985, Solar Phys. 94, 341.
Takakura, T.: 1967, Solar Phys. 1, 304.
Tandberg-Hanssen, E., Kaufmann, P., Reichmann, E. J., Teuber, D. L., Moore, R. L., Orwig, L. E., and Zirin, H.: 1984, Solar Phys. 90, 41.
van Beek, H.F., de Feiter, L. D., and de Jager, C.: 1974, Space Res. XIV, 447.
Vilmer, N., Trottet, G., Barat, C., Dezalay, J.P., Talon, R., Sunyaev, R., Terekhov, O., and Kuznetsov, A.: 1994, Space Sci. Rev. 68, 233.
Wild, J. P., Smerd, S. F., and Weiss, A. A.: 1963, Ann. Rev. Astron. Astrophys. 1, 291.
White, S. M., Kundu, M. R., Bastian, T. S., Gary, D. E., Hurford, G. J., Kucera, T., and Bieging, J. H.: 1992, Astrophys. J. 384, 656.
Zheleznyakov, V. V: 1965, Soviet Astron. 9, 73.
Zirin, H. and Tanaka, K.: 1973, Solar Phys. 32, 173.
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Kaufmann, P. Fast discrete emissions at hard X-rays and sub-mm-IR waves in the impulsive phase of solar bursts. Sol Phys 169, 377–388 (1996). https://doi.org/10.1007/BF00190614
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DOI: https://doi.org/10.1007/BF00190614