Abstract
The history of solar flare X-ray polarimetry is reviewed and it is shown that as yet, there is no experimental evidence for such polarization. The present experimental limits are at the level of a few percent but these results may be biased by a large thermal component at low energies which may decrease the apparent polarization. To avoid this difficulty it will be necessary to make observations at higher energies where thermal emission is less important.
The theoretical estimates of the polarization expected in the solar flare are also reviewed. The best present theoretical estimates are in the range of a few percent and are consistent with the present experimental limits.
In this paper we discuss a new satellite instrument that has sufficient sensitivity at high energies to detect the polarization that is predicted by the present theories. The instrument sensitivity for a moderate (M class) event approaches polarization levels of 1% in each of 7 energy bins spanning the 10 to 100 keV range for integration times as short as 10 s. Comparable results can be obtained for an X class flare in 1 s.
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References
Bai, T. and Ramaty, R.: 1978, Astrophys. J. 219, 705.
Brown, J. C.: 1972, Solar Phys. 26, 441.
Dermer, C. D. and Ramaty, R.: 1986, Astrophys. J. 301, 962.
Elwert, G.: 1968, in K. O. Kiepenheuer (ed.), ‘Structure and Development of Solar Active Regions’, IAU Symp. 35, 444.
Elwert, G. and Haug, E.: 1970, Solar Phys. 15, 234.
Elwert, G. and Haug, E.: 1971, Solar Phys. 20, 413.
Emslie, A. G. and Brown, J. C.: 1980, Astrophys. J. 237, 1015.
Emslie, A. G. and Vlahos, L.: 1980, Astrophys. J. 242, 359.
Haug, E.: 1972, Solar Phys. 25, 425.
Haug, E., Elwert, G., and Rausaria, R. R.: 1985, Astron. Astrophys. 148, 115.
Henoux, J. C.: 1975, Solar Phys. 42, 219.
Kane, S. R. et al.: 1980, Astrophys. J. 239, L85.
Korchak, A. A.: 1967, Soviet Phys. Dokl. 12, 192.
Langer, S. H. and Petrosian, V.: 1977, Astrophys. J. 215, 666.
Leach, J. and Petrosian, V.: 1983, Astrophys. J. 269, 715.
Leach, J., Emslie, A. G., and Petrosian, V.: 1985, Solar Phys. 96, 331.
Lemen, J. R.: 1981, Ph.D. Thesis, Columbia University (unpublished).
Lemen, J. R., Chanan, G. A., Hughes, J. P., Laser, M. R., Novick, R., Rochwarger, I. R., Sackson, M., and Tramiel, L. J.: 1982, Solar Phys. 80, 333.
Rieger, E., Reppin, C., Kanbach, G., Forrest, D. J., Chupp, E. L., and Share, G. H.: 1983, in 18th Int. Cosmic Ray Conf. (Late Papers), Bangalore 10, 338.
Tindo, I. P., Mandel'stam, S. L., and Shuryghin, A. I.: 1973, Solar Phys. 32, 469.
Tindo, I. P., Shuryghin, A. I., and Steffen, W.: 1976, Solar Phys. 46, 219.
Tindo, I. P., Ivanov, V. D., Mandel'stam, S. L., and Shuryghin, A. I.: 1972a, Solar Phys. 24, 429.
Tindo, I. P., Ivanov, V. D., Valníček, B., and Livshits, M. A.: 1972b, Solar Phys. 27, 426.
Tramiel, L. J., Chanan, G. A., and Novick, R.: 1984, Astrophys. J. 280, 440.
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Chanan, G., Emslie, A.G. & Novick, R. Prospects for solar flare X-ray polarimetry. Sol Phys 118, 309–319 (1988). https://doi.org/10.1007/BF00148598
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DOI: https://doi.org/10.1007/BF00148598