Abstract
An attempt has been made in the present work to reveal the directivity of solar non-thermal X-ray emission using the data obtained from the Prognoz and Explorer satellites. The frequency of occurrence of X-ray bursts and the mean intensities of the emission are studied as a function of distance from the central meridian. The most complete statistics have been obtained for the 4–24 keV X-ray bursts for the period 1970–1973. The X-ray burst frequency of occurrence normalized to the corresponding Hα flare frequency increases towards the solar limb. During the studied period this trend is more pronounced to the east than to the west. Distributions of the mean intensities of X-ray bursts are very similar to those of the frequency of occurrence of X-ray bursts; the effect is more noticeable for the low intensity bursts. The effect of the east-west asymmetry for Hα flares has been found to vary in magnitude and direction during the 20th solar activity cycle.
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References
Acton, L. W.: 1968, Astrophys. J. 152, 305.
Brown, J. C.: 1971, Solar Phys. 18, 489.
Brown, J. C.: 1972a, Solar Phys. 25, 158.
Brown, J. C.: 1972b, Solar Phys. 26, 441.
Catalano, C. P. and Van Allen, J. A.: 1973, Astrophys. J. 185, 335.
Datlowe, D. W., Elcan, M. J., and Hudson, H. S.: 1974, Solar Phys. 39, 155.
Drake, J. F.: 1971, Solar Phys. 16, 152.
Elwert, G.: 1968, in K. O. Kiepenheuer (ed.), ‘Structure and Development of Solar Active Regions’, IAU Symp. 35, 144.
Elwert, G. and Haug, E.: 1970, Solar Phys. 15, 234.
Elwert, G. and Haug, E.: 1971, Solar Phys. 20, 413.
Evstafiev, N. N., Kovrizhnikh, O. M., Melioranskii, A. S., Nazarova, N. L., Pankov, V. M., Rozantsev, I. N., Savenko, I. A., and Chupova, L. M.: 1974, Soln. Dannye, No. 12, 55.
Grigorov, N. L., Kovrizhnikh, O. M., Kudriavtsev, M. I., Melioranskii, A. S., Savenko, I. A., Chupova, L. M., and Shamolin, V. M.: 1973, Soln. Dannye, No. 6, 95.
Haug, E.: 1972, Solar Phys. 25, 425.
Henoux, J. C.: 1975, Solar Phys. 42, 219.
de Jager, C. and Kundu, M. R.: 1963, Space Res. Eng. III, 836.
Kane, S. R. and Anderson, K. A.: 1970, Astrophys. J. 162, 1003.
Korchak, A. A.: 1967, Soviet Astron.-A.J. 44, 328.
Kovrizhnikh, O. M., Kudriavtsev, M. I., Melioranskii, A. S., Savenko, I. A., Chupova, L. M., and Shamolin, V. M.: 1974, Soln. Dannye; No. 6, 94.
Letfus, V.: 1960, Bull. Astron. Inst. Czech. 11, 31.
Ohki, K.: 1969, Solar Phys. 7, 260.
Pintér, S.: 1969, Solar Phys. 8, 142.
Pizzichini, G., Spizzichino, A., and Vespignani, G. R.: 1974, Solar Phys. 35, 431.
Růžičková-Topolová, B.: 1974, Bull. Astron. Inst. Czech. 25, 345.
Sakurai, K.: 1973, Solar Phys. 31, 483.
Santangelo, N., Horstman, O., and Horstman-Moretti, E.: 1973, Solar Phys. 29, 143.
Smith, H. J. and Smith, E. P.: 1963, Solar Flares, Macmillan, New York.
Solar Geophys. Data, Boulder, 1965–1974.
Syrovatskii, S. I. and Shmeleva, O. P.: 1972, Soviet Astron.-A. J. 49, 334.
Takakura, T. and Kai, K.: 1966, Publ. Astron. Soc. Jap. 18, 57.
Tomblin, F.: 1972, Astrophys. J. 171, 377.
Warwick, C. S.: 1954, Astrophys. J. 120, 237.
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Kovrizhnikh, O.M., Savenko, I.A. & Chupova, L.M. Directivity of non-thermal X-ray emission from solar flares. Sol Phys 50, 447–456 (1976). https://doi.org/10.1007/BF00155306
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DOI: https://doi.org/10.1007/BF00155306