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The frequency variation of Pc5 ULF waves during a magnetic storm
Earth, Planets and Space volume 57, pages 619–625 (2005)
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.
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.
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.
Chen, L. and A. Hasegawa, A theory of long-period magnetic pulsations, J. Geophys. Res., 79, 1024, 1974.
Daglis, I. A., The role of magnetosphere-ionosphere coupling in magnetic storm dynamics, in Magnetic Storms, AGU Monogragh, 98, 107–116, 1997.
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.
Fu, S. Y., et al., Temporal and spatial variation of the ion composition in the ring current, Space Science Reviews, 95, 539–554, 2001.
Glassmeier, K.-H., ULF pulsations, in Handbook of Atmospheric Electrodynamics, volume II, Chapter 14, pp. 482–503, 1995.
Jordanova, V. K. and R. M. Thorne, Ring current dynamics during the 13–18 July 2000 storm period, Solar Physics, 204, 361–375, 2001.
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.
Obayashi, T. and J. A. Jacobs, Geomagnetic pulsations and the Earth’s outer atmosphere, Geophys. J. R. Astr. Soc., 1, 53, 1958.
Southwood, D. J., Some features of field line resonances in the magnetosphere, Planet. Space Sci., 17, 483, 1974.
Takahashi, K., B. J. Anderson, and S. Ohtani, Multisatellite study of night-side transient toroidal waves, J. Geophys. Res., 101, 24815–24825, 1996.
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.
Torrence, C. and G. P. Compo, A practical guide to wavelet analysis, Bull. Amer. Meteor. Soc., 79, 61–78, 1998.
Voelker, H., Zur Breitenabhangigkeit der perioden erdmagnetischer pulsations, Naturwissenschaften, 49, 8–9, 1962.
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.
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.
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
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.
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.
Yumoto, K., Long-period magnetic pulsations generated in the magnetosperic boundary layers, Planet. Space Sci., 32, 1205–1218, 1984.
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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
- ULF waves
- magnetic storm
- ring current