Abstract
In Paper I (Emslie, 1985) we derived ‘scaling laws’ which relate peak loop temperature to injected non-thermal electron flux in electron-heated models of the flare corona. In this paper, we compare these predicted relationships with recent coordinated observations in hard X-rays and soft X-rays. Satisfactory agreement is found for large events, while for smaller events the plasma electron temperature determined by soft X-ray spectral fitting is too high. We discuss a possible resolution of this apparent discrepancy through careful examination of the method used to determine the temperature of the soft X-ray emitting plasma. It is concluded that temperatures determined by spectral fitting over a series of lines are not necessarily representative of the true temperature of the plasma, since the fitting technique is plagued by the same difficulties as a more straightforward technique involving a single spectral line or portion of continuum (Craig and Brown, 1976). The differences between actual and derived temperatures are sufficiently large to remove the above discrepancy between observations and modeling of electron-heated coronae.
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Acton, L. W., Culhane, J. L., Gabriel, A. H., Bentley, R. D., Bewies, J. A., Firth, J. G., Finch, M. L., Gilbreth, C. W., Guttridge, P., Hayes, R. W., Joki, E. G., Jones, B. B., Kent, B. J., Leibacher, J. W., Nobles, R. A., Patrick, T. J., Phillips, K. J. H., Rapley, C. G., Sheather, P. H., Sherman, J. C., Stark, J. P., Springer, L. A., Turner, R. F., and Wolfson, C. J.: 1980, Solar Phys. 65, 53.
Antiochos, S. K. and Sturrock, P. A.: 1976, Solar Phys. 49, 359.
Antonucci, E., Gabriel, A. H., Acton, L. W., Culhane, J. L., Doyle, J. G., Leibacher, J. W., Machado, M. E., Orwig, L. E., and Rapley, C. G.: 1982, Solar Phys. 78, 107.
Antonucci, E., Gabriel, A. H., and Dennis, B. R.: 1984, Astrophys. J. 287, 917.
Brown, J. C.: 1971, Solar Phys. 18, 489.
Craig, I. J. D. and Brown, J. C.: 1976, Astron. Astrophys. 59, 239.
de Jager, C. and de Jonge, G.: 1978, Solar Phys. 58, 127.
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, The Hard X-Ray Burst Spectrometer Event Listing 1980, 1981 and 1982, NASA Technical Memorandum 84998, Goddard Space Flight Center.
Emslie, A. G.: 1980, Astrophys. J. 235, 1055.
Emslie, A. G.: 1981, Astrophys. J. 249, 817.
Emslie, A. G.: 1985, Solar Phys. 98, 281 (Paper I).
Emslie, A. G., Phillips, K. J. H., and Dennis, B. R.: 1985, Solar Phys., in press.
Gabriel, A. H.: 1972, Monthly Notices Roy. Astron. Soc. 160, 99.
Knight, J. W. and Sturrock, P. A.: 1977, Astrophys. J. 218, 306.
McClymont, A. N., Canfleld, R. C., and Fisher, G. H.: 1985, quoted in Section II.E.1 of Canfield et al., Impulsive Phase Transport, in Solar Flares: Proceedings of the SMM Workshop.
Mewe, R. and Gronenschild, E. H. B. M.: 1981, Astron. Astrophys. Suppl. Ser. 45, 11.
Orwig, L. E., Frost, K. J. and Dennis, B. R.: 1980, Solar Phys. 65, 25.
Spitzer, L. W.: 1962, Physics of Fully Ionized Gases, 2nd ed., Interscience, New York.
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Gordon Emslie, A. The structure of high-temperature flare plasma. Sol Phys 103, 103–110 (1986). https://doi.org/10.1007/BF00154861
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DOI: https://doi.org/10.1007/BF00154861