Abstract
X-ray images taken by the Hard X-Ray Imaging Spectrometer (HXIS) aboard SMM during the 1980, November 18 limb flare are analysed. The temporal and spatial evolutions of the X-radiation are described. They differ significantly for hard and soft X-rays. During the elementary flare bursts energetic photons are predominantly emitted from a region close to the solar limb. In contrast, the soft X-ray sources are situated higher in the solar atmosphere. The observed X-ray spectra, in particular those emitted from small source regions at various altitudes, were fitted to power laws. Analysis of the spatial variation of the spectral index shows that there is a systematic tendency of the spectra to get harder with decreasing source altitude, especially during the elementary flare bursts. This fact is in agreement with the existence of nonthermal electron beams precipitating from the corona towards the denser layers of the solar atmosphere.
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References
Brown, J. C. and Hayward, J.: 1981, Solar Phys. 73, 121.
Crannell, C. J., Frost, K. J., Mätzler, C., Ohki, K., and Saba, J. L.: 1978, Astrophys. J. 223, 620.
Datlowe, D. W. and Lin, R. P.: 1973, Solar Phys. 32, 459.
Donnelly, R. F. and Kane, S. R.: 1978, Astrophys. J. 222, 1043.
Haug, E., Elwert, G., and Hoyng, P.: 1984, Adv. Space. Res. 4, 211.
Haug, E., Elwert, G., and Rausaria, R. R.: 1985, Astron. Astrophys. 146, 159.
Kane, S. R.: 1974, in G. Newkirk (ed.), ‘Coronal Disturbances’, IAU Symp. 57, 105.
Kane, S. R.: 1983, Solar Phys. 86, 355.
Kane, S. R., Anderson, K. A., Evans, W. D., Klebesadel, R. W., and Laros, W.: 1979, Astrophys. J. 223, L151.
Kane, S. R., Crannell, C. J., Datlowe, D., Feldman, U., Gabriel, A., Hudson, H. S., Kundu, M. R., Mätzler, C., Neidig, D., Petrosian, V., and Sheeley, N. R.: 1980, in P. A. Sturrock (ed.), Solar Flares, Colorado Assoc. Univ. Press, p. 187.
Melrose, D. B. and Brown, J. C.: 1976, Monthly Notices Roy. Astron. Soc. 176, 15.
Orwig, L. E., Frost, K. J., and Dennis, B. R.: 1980, Solar Phys. 65, 25.
Sakurai, T.: 1985, Solar Phys. 95, 311.
Simnett, G. M. and Strong, K. T.: 1984, Astrophys. J. 284, 839.
Smith, D. F.: 1985, Astrophys. J. 288, 801.
Takakura, T.: 1973, in R. Ramaty and R. G. Stone (eds.), High Energy Phenomena on the Sun, NASA SP-342, p. 179.
Van Beek, H. F., De Feiter, L. D., and De Jager, C.: 1974, Space Res. XIV, 447.
Van Beek, H. F., Hoyng, P., Lafleur, B., and Simnett, G. M.: 1980, Solar Phys. 65, 39.
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Haug, E., Elwert, G. Evidence for beamed electrons in a limb X-ray flare observed by HXIS. Sol Phys 99, 219–230 (1985). https://doi.org/10.1007/BF00157309
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DOI: https://doi.org/10.1007/BF00157309