Letter | Published:

Galactic X-ray sources and the ionospheric D region

Naturevolume 257pages3435 (1975) | Download Citation



SEVERAL authors (see refs 1–5 for example) have studied the possible influence of galactic point X-ray sources in the ionospheric D region. The observed variabilities in phase and amplitude of very low frequency (v.l.f.) night-time propagation have been attributed to different ionisation sources, but the relationship between the appearance of strong X-ray sources in the sky and the recorded v.1.f. phase and intensity variations has been emphasised. Particularly important are the effects of Sco X-1, Cen X-2 and Cen X-4.

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  1. 1

    Baird, G. A., and Francey, R. J., J. geophys. Res., 77, 1967 (1967).

  2. 2

    Sharma, D. P., et al., Astrophys. Space Sci., 17, 409 (1972).

  3. 3

    Aikin, A. C., COSPAR Symp. Aeronomy Rep., 48, 96 (Univ. Illinois, Illinos, 1972).

  4. 4

    Kaufmann, P., Paes De Barros, M. H., and Vianna, N. E., Nature, 228, 1080 (1970).

  5. 5

    Mitra, A. P., and Romanamurty, Y. V., Radio Sci., 7, 67 (1972).

  6. 6

    Gagliardini, D. A., and Karszenbaum, H., J. atmos. terr. Phys. (in the press).

  7. 7

    Clark, G. W., et al., Astrophys. J., 179, 263 (1973).

  8. 8

    Peterson, L. Non Solar X and Gamma Ray Astromony (edit. by Gratton, L.), 59 (1970).

  9. 9

    Lewin, W. A. G., McClintock, J. E., Ryckman, S. G., Glass, I. S., and Smith, W., Astrophys. J. Lett., 162, L109 (1970).

  10. 10

    Rappaport, S., Bradt, H. V., Naranan, S., and Spada, G., Nature, 221, 428 (1969).

  11. 11

    Young, J. N., Carruther, T. C., Holme, S., Johnson, Y., and Patterson, N. P., Science, 160, 990 (1969).

  12. 12

    Meira, L. G., J. geophys. Res., 76, 202 (1971).

  13. 13

    Winter, T. C., and Chubb, T. A., J. geophys. Res., 72, 4405 (1967).

  14. 14

    Velinov, P. J., J. atmos. terr. Phys., 30, 1891 (1968).

  15. 15

    Kitamura, T., et al., Nature, 224, 784 (1969).

  16. 16

    Cooke, B. A., Pounds, K. A., Stewardson, E. A., and Adams, D. J., Astrophys. J., Lett., 150, L189 (1967).

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  1. Aeronomy Group, Engineering Department, Universidad Nacional de La Plata, and Comisión Nacional de Estudios Geo-Helioffsicos, Corrientes 640, Piso 11, Buenos Aires, Argentina



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