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The frequency variation of Pc5 ULF waves during a magnetic storm

Abstract

The relationship between Pc5 ULF waves and the asymmetric ring current during the magnetic storm on July 15, 2000 is studied using ground-based magnetometer data and particle observations by the LANL satellite. A frequency decreases of Pc5 is noted during the main phase, which can be attributed to injections of heavier ions (O+ and He+) into the ring current. In addition, it is observed that during the main phase of the storm, the frequency drop of the Pc5 in the IMAGE chain around the MLT midnight is larger than that in the ALASKA chain at MLT post noon. Meanwhile, the longitudinal variation ΔH with the maximum around midnight implies a highly asymmetric distribution of the ring current. These results suggested that the frequency variation of Pc5 pulsation during storms is related to the partial distribution in the ring current.

References

  1. Akasofu, S.-I., W. Sun, and B.-H. Ann, Comments on some long-standing problems in storm/substorm studies, Disturbances in Geospace: The storm-substorm relationship, Geophysical Monograph, 142, 243–254, 2003.

    Google Scholar 

  2. Anderson, B. J., Statistical studies of Pc 3–5 pulsations and their relevance for possible source mechanisms of ULF waves, Ann. Geophysicae, 11, 128–143, 1993.

    Google Scholar 

  3. Chen, L. and A. Hasegawa, A theory of long-period magnetic pulsations, J. Geophys. Res., 79, 1024, 1974.

    Article  Google Scholar 

  4. Daglis, I. A., The role of magnetosphere-ionosphere coupling in magnetic storm dynamics, in Magnetic Storms, AGU Monogragh, 98, 107–116, 1997.

    Article  Google Scholar 

  5. Du, A., et al., Characteristics of Pc5 ULF waves during the magnetic storm on July 15–16, 2000, Chinese Geophysics Journal, 46(3), 322–327, 2003.

    Article  Google Scholar 

  6. Fu, S. Y., et al., Temporal and spatial variation of the ion composition in the ring current, Space Science Reviews, 95, 539–554, 2001.

    Article  Google Scholar 

  7. Glassmeier, K.-H., ULF pulsations, in Handbook of Atmospheric Electrodynamics, volume II, Chapter 14, pp. 482–503, 1995.

    Google Scholar 

  8. Jordanova, V. K. and R. M. Thorne, Ring current dynamics during the 13–18 July 2000 storm period, Solar Physics, 204, 361–375, 2001.

    Article  Google Scholar 

  9. Mathie, R. A., F. W. Menk, I. R. Mann, and D. Orr, Discrete field line resonances and the Alfven continuum in the outer magnetosphere, Geophys. Res. Lett., 26, 659–662, 1999.

    Article  Google Scholar 

  10. Obayashi, T. and J. A. Jacobs, Geomagnetic pulsations and the Earth’s outer atmosphere, Geophys. J. R. Astr. Soc., 1, 53, 1958.

    Article  Google Scholar 

  11. Southwood, D. J., Some features of field line resonances in the magnetosphere, Planet. Space Sci., 17, 483, 1974.

    Article  Google Scholar 

  12. Takahashi, K., B. J. Anderson, and S. Ohtani, Multisatellite study of night-side transient toroidal waves, J. Geophys. Res., 101, 24815–24825, 1996.

    Article  Google Scholar 

  13. Tamao, T., Transmission and coupling resonance of hydromagnetic disturbances on the non-uniform Earth’s magnetosphere, Sci. Rep. Tohoku Univ., Ser. 5, 17, 43, 1966.

    Google Scholar 

  14. Torrence, C. and G. P. Compo, A practical guide to wavelet analysis, Bull. Amer. Meteor. Soc., 79, 61–78, 1998.

    Article  Google Scholar 

  15. Voelker, H., Zur Breitenabhangigkeit der perioden erdmagnetischer pulsations, Naturwissenschaften, 49, 8–9, 1962.

    Article  Google Scholar 

  16. Waters, C. L., F. W. Menk, and B. J. Fraser, The resonance structure of low latitude Pc3 geomagnetic pulsations, Geophys. Res. Lett., 18, 2293, 1991.

    Article  Google Scholar 

  17. Waters, C. L., J. C. Samson, and E. F. Donovan, The temporal variation of the frequency of high latitude field line resonances, J. Geophys. Res., 100, 7987–7996, 1995.

    Article  Google Scholar 

  18. Waters, C. L., J. C. Samson, and E. F. Donovan, Variation of plasmatrough density derived from magnetospheric field line resonances, J. Geophys. Res., 101, 24737, 1

    Article  Google Scholar 

  19. Waters, C. L., B. G. Harrold, et al., Field line resonances and waveguide modes at low latitudes, J. Geophys. Res., 105(A4), 7763–7774, 2000.

    Article  Google Scholar 

  20. Yeoman, T. K. and D. M. Wright, ULF waves with drift resonance and drift-bounce resonance energy sources as observed in artificially-induced HF radar backscatter, Annales Geophysicae, 19, 159–170, 2001.

    Article  Google Scholar 

  21. Yumoto, K., Long-period magnetic pulsations generated in the magnetosperic boundary layers, Planet. Space Sci., 32, 1205–1218, 1984.

    Article  Google Scholar 

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Correspondence to A. Du.

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Du, A., Sun, W., Xu, W. et al. The frequency variation of Pc5 ULF waves during a magnetic storm. Earth Planet Sp 57, 619–625 (2005). https://doi.org/10.1186/BF03351841

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Key-words

  • ULF waves
  • magnetic storm
  • ring current