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Characteristics of consecutive bursts of Pi2 pulsations observed at the SMALL array: A new implication

Abstract

Consecutive bursts of Pi2 pulsations are examined with magnetic field data obtained by the SMALL array in 1999. With reference to the H-component magnetic bays in the high-latitude magnetograms at CPMN, 10 events consisting of two consecutive Pi2 bursts simultaneously observed by the Beijing (BJI, L = 1.46) and Wuhan (WHN, L = 1.20) stations are identified as associated with substorm onsets. Owing to the same waveform seen by the CPMN and IGPP/LANL arrays, they are the global phenomena. Their occurrences are mostly in the 2100–2300 LT (local time) sector in which the dominant frequencies at WHN are higher than the mean frequency, but those at BJI are lower and close to the frequency of the surface wave at the plasmapause. Moreover, the LT dependence of azimuth and polarization of two consecutive Pi2 bursts at BJI and WHN are analyzed and consistent with the ULF waves theory by Itonaga and Yumoto (1998). GOES 8 and GOES 10 confirm the formation of the substorm current wedge after the onsets of two Pi2 bursts. Thus during substorm onsets, Pi2 pulsations at low latitudes may result from hydromagnetic waves driven by an impulsive source in the magnetotail which could commence in the longitude of 2230 LT and later propagate westward and eastward as well. Low-latitude Pi2 waves near the source site may be affected by several factors as they propagate by the stimulation of a surface wave at the plasmapause, by a localized field line oscillation inside the plasmapause, and by the magnetospheric/plasmaspheric cavity (resonance) mode.

References

  • Bauer, T. M., W. Baumjohann, and R. A. Treumann, Neutral sheet oscillations at substorm onset, J. Geophys. Res., 100, 23,737–23,742, 1995.

    Article  Google Scholar 

  • Baumjohann, W. and K. H. Glassmeier, The transient response mechanism and Pi2 pulsations at substorm onset—Review and outlook, Planet. Space Sci., 32, 1361–1370, 1984.

    Article  Google Scholar 

  • Burch et al., Global dynamics of the plasmasphere and ring current during magnetic storms, Geophys. Res. Lett., 28, 1159–1162, 2001.

    Article  Google Scholar 

  • Cheng, C.-C., J.-K. Chao, and T.-S. Hsu, Evidence of the coupling of a fast magnetospheric cavity mode to field line resonances, Earth Planets Space,50, 683–697, 1998.

    Article  Google Scholar 

  • Cheng, C.-C., J.-K. Chao, and K. Yumoto, Spectral power of low-latitude Pi2 pulsations at 210° magnetic meridian stations and plasmaspheric cavity resonances, Earth Planets Space,52, 615–627, 2000.

    Article  Google Scholar 

  • Cheng, C.-C., C. T. Russell, Y. F. Gao, and P. J. Chi, On consecutive bursts of low-latitude Pi2 pulsations, J. Atoms. Sol. Terr. Phys., 64, 1809–1821, 2002a.

    Article  Google Scholar 

  • Cheng, C.-C., C. T. Russell, M. Connors, and P. J. Chi, Relationship between multiple substorm onsets and the IMF: A case study, J. Geophys. Res., 107(A10), 1289, doi:10.1029/2001JA007553, 2002b.

    Article  Google Scholar 

  • Fujita, S. and M. Itonaga, A plasmaspheric cavity resonance in a longitudinally non-uniform plasmasphere, Earth Planets Space, 55, 219–222, 2003.

    Article  Google Scholar 

  • Fujita, S., H. Nakata, M. Itonaga, A. Yoshikawa, and T. Mizuta, A numerical simulation of the Pi2 pulsations associated with the substorm current wedge, J. Geophys. Res., 107(A3), 1034, doi:10.1029/2001JA900137, 2002.

    Article  Google Scholar 

  • Gao, Y. F., P. J. Chi, G. Le, C. T. Russell, D. M. Yang, X. Zhou, S. F. Yang, V. Angelopoulos, and F. K. Chun, Sino-magnetic array at low latitudes (SMALL) including initial results from the sister sites in the united states, Adv. Space Res., 25, 1343–1351, 2000.

    Article  Google Scholar 

  • Itonaga, M., Spatial structure and polarization of geomagnetic pulsations observed on the ground, J. Geomag. Geoelectr., 47, 1023–1027, 1995.

    Article  Google Scholar 

  • Itonaga, M. and K. Yomoto, ULF waves and the ground magnetic field, J. Geophys. Res., 103, 9285–9291, 1998.

    Article  Google Scholar 

  • Kepko, L. and M. G. Kivelson, Generation of Pi2 pulsations by bursty bulk flows, J. Geophys. Res., 104, 25021–25034, 1999.

    Article  Google Scholar 

  • Kosaka, K., T. Iyemori, M. Nosé, M. Bitterly, and J. Bitterly, Local time dependence of the dominant frequency of Pi2 pulsations at mid- and lowlatitudes, Earth Planets Space, 54, 771–781, 2002.

    Article  Google Scholar 

  • Lanzerotti, L. J. and L. V. Medford, Local night, impulsive (Pi2-type) hydromagnetic wave polarization at low latitudes, Planet. Space Sci., 32, 135–142, 1984.

    Article  Google Scholar 

  • Lee, D. H. and K. Kim, Compressional MHD waves in the magnetosphere: A new approach, J. Geophys. Res., 104, 12,379–12,385, 1999.

    Article  Google Scholar 

  • Lester, M., H. J. Singer, D. P. Smits, and W. J. Hughes, Pi2 pulsations and the substorm current wedge: Low-latitude polarization, J. Geophys. Res., 94, 17133–17141, 1989.

    Article  Google Scholar 

  • Li, Y., B. J. Fraser, F. W. Menk, D. J. Webster, and K. Yumoto, Properties and sources of low and very low latitude Pi2 pulsations, J. Geophys. Res., 103, 2343–2358, 1998.

    Article  Google Scholar 

  • Lin, C. A., L. C. Lee, and Y. J. Sun, Observations of Pi2 pulsations at a very low latitude (L=1.06) station and magnetospheric cavity resonances, J. Geophys. Res., 96, 21,105–21,114, 1991.

    Article  Google Scholar 

  • Mishin, V. M., T. Saifudinova, A. Bazarzhapov, C. T. Russell, W. Baumjohann, B. Nakamura, and M. Kubyshkina, Two distinct substorm onsets, J. Geophys. Res., 106, 13,105–13,118, 2001.

    Article  Google Scholar 

  • Nosé, M., Automated detection of Pi2 pulsations using wavelet analysis: 2. An application for dayside Pi2 pulsations study, Earth Planets Space,51, 23–32, 1999.

    Article  Google Scholar 

  • Nosé et al., Multipoint observations of a Pi2 pulsation on morningside: The 20 September 1995 event, J. Geophys. Res., 108(A5), 1219, doi:10.1029/2002JA009747, 2003.

    Article  Google Scholar 

  • Olson, J. V., Pi2 pulsations and substorm onsets: A review, J. Geophys. Res., 104, 17,499–17,520, 1999.

    Article  Google Scholar 

  • Rankin, D. and R. Kurtz, Statistic study of micropulsation polarizations, J. Geophys. Res., 75, 5444–5458, 1970.

    Article  Google Scholar 

  • Russell, C. T., Interactive analysis of magnetic field data, Adv. Space Res., 2(7), 173–176, 1983.

    Article  Google Scholar 

  • Russell, C. T., How northward turnings of the IMF can lead to substorm expansion onsets, Geophys. Res. Lett., 27, 3257–3259, 2000.

    Article  Google Scholar 

  • Shiokawa, K., W. Baumjohann, G. Haerendel, G. Paschmann, J. F. Fennell, E. Friis-Christensen, H. Luhr, G. D. Reeves, C. T. Russell, P. R. Sutciffe, and K. Takahashi, High-speed ion flow, substorm current wedge, and multiple Pi2 pulsations, J. Geophys. Res., 103, 4491–4507, 1998.

    Article  Google Scholar 

  • Takahashi, K., S. I. Ohtani, and B. J. Anderson, Statistical analysis of Pi2 pulsations observed by the AMPTE CCE spacecraft in the inner magnetosphere, J. Geophys. Res., 100, 21,929–21,941, 1995.

    Article  Google Scholar 

  • Takahashi, K., S. I. Ohtani, W. J. Hughes, and B. J. Anderson, CRRES observation of Pi2 pulsations: Wave mode inside and outside the plasmasphere, J. Geophys. Res., 106, 15,567–15,581, 2001.

    Article  Google Scholar 

  • Villante, U., M. Vellante, M. De Biase, L. J. Lanzerotti, and L. V. Medford, Pi2 pulsations at separate site (ΔΦ90°): a comparison between midand low-latitude observations, Ann. Geophys., 10, 472–482, 1992.

    Google Scholar 

  • Yamaguchi et al., The timing relationship between bursty bulk flows and Pi2s at the geosynchronous orbit, Geophys. Res. Lett., 29, doi:10.1029/2001GL013783, 2002.

  • Yumoto, K., Generation and propagation mechanisms of low-latitude magnetic pulsations—A review, J. Geophys., 60, 79–105, 1986.

    Google Scholar 

  • Yumoto, K., H. Osaki, K. Fukao, K. Shiokawa, Y. Tanaka, S. I. Soloeyev, G. Krymskij, E. F. Vershinin, V. F. Osinin, and 210° MM Magnetic Observation Group, Correlation of high- and low-latitude Pi2 magnetic pulsations observed at 210° magnetic meridian chain stations, J. Geomag. Geoelectr., 46, 925–935, 1994.

    Article  Google Scholar 

  • Yumoto, K. and the CPMN Group, Chararcteristics of Pi2 magnetic pulsations observed at the CPMN stations: A review of the STEP results, Earth Planets Space,53, 981–992, 2001.

    Article  Google Scholar 

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Correspondence to C. -C. Cheng.

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Cheng, C.C., Russell, C.T., Yumoto, K. et al. Characteristics of consecutive bursts of Pi2 pulsations observed at the SMALL array: A new implication. Earth Planet Sp 56, 531–545 (2004). https://doi.org/10.1186/BF03352513

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  • DOI: https://doi.org/10.1186/BF03352513

Key words

  • Pi2 pulsations
  • substorm onsets
  • ULF waves