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Some relationships between solar X-ray bursts and SPA's produced on VLF propagation in the lower ionosphere

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Abstract

This paper discusses SPA's measured at long VLF propagation paths in the lower ionosphere and their association with solar X-ray bursts observed by USNRL satellites in the 0–3 Å, 0–8 Å and 8–20 Å bands. Excellent correlations were found between the SPA importances (in degrees per Mm) and the logarithm of the X-ray burst peak intensities. A hardening of the X-ray burst spectra is evident for increasing importance of SPA's; the threshold energy required for the occurrence of such anomalies was estimated, it is 4.3×10−5 ergs cm−2 sec−1 in the main ionizing band of 0–3 Å. It was also possible to derive the effective recombination coefficient at the normal D-region height of 70 km, this beingα r≈6×10−6 cm3 sec−1; furthermore ion production rates were estimated during SPA's at heights below the reference level.

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References

  • Acton, L. W., Chubb, T. A., Kreplin, R. W., and Meekins, J. F.: 1963,J. Geophys. Res. 68, 3335.

    Article  ADS  Google Scholar 

  • Arnoldy, R. L., Kane, S. R., and Winckler, J. R.: 1967,Solar Phys. 2, 171.

    Article  ADS  Google Scholar 

  • Belrose, J. S. and Bourne, I. A.: 1967, inProc. Conf. on Ground-Based Radio Wave Propagation Studies of the Lower Ionosphere, Defense Research Telecommunications Establishment, Canada, and AFCRL, USA, p. 79.

    Google Scholar 

  • Burgess, B. and Jones, T. B.: 1967,Radio Sci. 2, 619.

    Google Scholar 

  • Chilton, C. J., Steele, F. K., and Norton, R. B.: 1963,J. Geophys. Res. 68, 5421.

    ADS  Google Scholar 

  • Chilton, C. J., Conner, J. P., and Steele, F. K.: 1965,Proc. IEEE 53, 2018.

    Article  Google Scholar 

  • Cole, A. E., Court, A., and Kantor, A. J.: 1965, inHandbook of Geophysics and Space Environments (ed. by S. L. Valley), AFCRL, USA, 2-1.

  • Crain, C. M.: 1967, inProc. Conf. on Ground-Based Radio Wave Propagation Studies of the Lower Ionosphere, Defense Research Telecommunications Establishment, Canada, and AFCRL, USA, p. 1.

  • Crain, C. M.: 1961,J. Geophys. Res. 66, 1117.

    Article  ADS  Google Scholar 

  • Crombie, D. D.: 1965,Proc. IEEE 53, 2009.

    Article  Google Scholar 

  • de Jager, C.: 1965,Ann. Astrophys. 28, 125.

    ADS  Google Scholar 

  • Forsythe, W. E.: 1956, inSmithsonian Physical Tables, Smithsonian Institution, Washington, USA, p. 705.

    Google Scholar 

  • Friedman, H.: 1960, inPhysics of the Upper Atmosphere (ed. by J. A. Ratcliffe), Academic Press, New York, p. 133.

    Google Scholar 

  • Hudson, H. S., Peterson, L. E., and Schwartz, D. A.: 1968, ‘Solar and Cosmic X-Rays above 7.7 keV’, Univ. of California, San Diego, Preprint UCSD-SP-68-4.

    Google Scholar 

  • Kaufmann, P. and Mendes, A. M.: 1968,J. Geophys. Res. 73, 2487.

    Article  ADS  Google Scholar 

  • Kaufmann, P. and Mendes, A. M.: 1969,J. Atmos. Terr. Phys., in press.

  • Kreplin, R. W.: 1964, inSpace Research, Vol. V (ed. by P. Muller), North-Holland Publ. Co., Netherlands, p. 951.

    Google Scholar 

  • Kreplin, R. W., Chubb, T. A., and Friedman, H.: 1962,J. Geophys. Res. 67, 2231.

    Article  ADS  Google Scholar 

  • Kreplin, R. W.: 1966, Final Data and Calibrations for Explorer 30 (NRL Solrad 8) X-Ray Monitoring Experiment (1965-93A), NRL E. O. Hulbert Center for Space Research Report, USA, January.

  • Lindsay, J. C.: 1963, The Solar EUV Radiation (1–400 Å), Goddard Space Flight Center, Rept. X-614-63-256.

  • Minzer, R. A., Champion, K. S. W., and Pond, H. L.: 1959,A.F. Surveys in Geophysics 115, August.

  • Nicolet, M. and Aikin, A. C.: 1960,J. Geophys. Res. 65, 1469.

    Article  ADS  Google Scholar 

  • Pierce, E. T.: 1961,J. Res. Natl. Bur. Std. 65D, 543.

    Google Scholar 

  • Reid, G. C.: 1964,Rev. Geophys. 2, 311.

    Article  ADS  Google Scholar 

  • Swift, D. W.: 1961,J. Atmos. Terr. Phys. 23, 29.

    Article  Google Scholar 

  • Wait, J. R.: 1959,Proc. IRE 47, 998.

    Google Scholar 

  • Wait, J. R. and Walters, L. C.: 1963,J. Res. Natl. Bur. Std. 67D, 361.

    Google Scholar 

  • Wait, J. R. and Spies, K. P.: 1964,Natl. Bur. Std. Tech. Note, No. 300.

  • Walker, Jr., A. B. C. and Rugge, H. R.: 1967, COSPAR Symposium on Solar Flares, Tokyo, Japan, p. 102.

  • Whitten, R. C., Poppoff, I. G., Edmonds, R. S., and Berning, W. W.: 1965,J. Geophys. Res. 70, 1737.

    Article  ADS  Google Scholar 

  • Whitten, R. C. and Poppoff, I. G.: 1965,Physics of the Lower Ionosphere, Prentice-Hall, Inc., USA, Chapter 2.

    Google Scholar 

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Authors and Affiliations

  1. Centre of Radio Astronomy and Astrophysics, Mackenzie University, São Paulo, Brasil

    Pierre Kaufmann & M. H. Paes de Barros

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  1. Pierre Kaufmann
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  2. M. H. Paes de Barros
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Kaufmann, P., Paes de Barros, M.H. Some relationships between solar X-ray bursts and SPA's produced on VLF propagation in the lower ionosphere. Sol Phys 9, 478–486 (1969). https://doi.org/10.1007/BF02391673

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  • DOI: https://doi.org/10.1007/BF02391673

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