Abstract
With the 4-s resolution data of the magnetometer and the ion plasma analyzer on TC-1 from June to November of each year during the period of 2004-2006, we statistically analyzed the occurrence rate of both convective and field-aligned bursty flows (FABFs). A near-Earth bursty bulk flow (NEBBF) occurred during both the quiet time and substorm process. In general, the magnetic field and the plasma density began oscillating with the appearance of the NEBBF associated with a distinct increase of the AE index. The increase of AE index during the NEBBF was more than 100 nT in both quiet time and substorm process. The statistical analysis indicated that the occurrence rates of the FABFs were nearly the same in the different stages of the AE index, but the occurrence rate of the NEBBFs was much higher in the growth stage of the AE index, indicating that the NEBBFs were directly related to the growth and expansion phases of the substorm. The observations suggested that the quite large number of BBFs from the mid magnetotail could enter into the near-Earth tail and play important role in triggering the substorm onset.
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Fairfield D H, Ness N F. Configuration of the geomagnetic tail during substorms. J Geophys Res, 1970, 75: 7032–7047
McPherron R L. Substorm related changes in the geomagnetic tail: the growth phase. Planet Space Sci, 1972, 20: 1521–1539
Nagai T, Baker D N, Higbie P R. Development of substorm activity in multiple-onset substorms at synchronous orbit. J Geophys Res, 1983, 88: 6994–7004
Lui A T Y. Current disruption in the Earth’s magnetosphere: Observations and models. J Geophys Res, 1996, 101: 13067–13088
Angelopoulos V, Baumjohann W, Kennel C F, et al. Bursty bulk flows in the inner central plasma sheet. J Geophys Res, 1992, 97: 4027–4039
Baker D N, Pulkkinen T I, Angelopoulos V, et al. The neutral line model of substorms: Past results and present view. J Geophys Res, 1996, 101: 12975–13010
Baumjohann W. Modes of convection in the magnetotail. Phys Plasmas, 2002, 9: 3665–3667
Baumjohann W, Hesse M, Kokubun S, et al. Substorm dipolarization and recovery. J Geophys Res, 1999, 104: 24995–25000
Baumjohann W, Paschmann G, Sckopke N, et al. Average ion moments in the plasma sheet boundary layer. J Geophys Res, 1988, 93: 11507–11520
Baumjohann W, Paschmann G, Cattell C A. Average plasma properties in the center plasma sheet. J Geophys Res, 1989, 94: 6597–6606
Baumjohann W, Paschmann G, Lühr H. Characteristics of high-speed ion flows in the plasma sheet. J Geophys Res, 1990, 95: 11507–11520
Nakamura R, Baumjohann W, Brittnacher M, et al. Flow bursts and auroral activations, onset timing and footpoint location. J Geophys Res, 2001, 106: 10777–10790
Nakamura R, Baumjohann W, Schödel R, et al. Earthward flow bursts, auroral streamers and small expansions. J Geophys Res, 2001, 106: 10791–10801
Cao J B, Ma Y D, Park G, et al. Joint observations by cluster satellites of bursty bulk flows in the magnetotail. J Geophys Res, 2006, 111: A04206, doi:10.1029/2005JA011322
Shiokawa K, Baumjohann W, Haerendel G, et al. High-speed ion flow, substorm current wedge, and multiple Pi2 pulsations. J Geophys Res, 1998, 103: 4491–4507
Carr C, Brown P, Zhang T L, et al. The Double Star magnetic field investigation: instrument design, performance and highlights of the first year’s observations. Ann Geophys, 2005, 23: 2713–2732
Rème H, Dandouras I, Aoustin C, et al. The HIA instrument on board the Tan Ce 1 Double Star near-equatorial spacecraft and its first results. Ann Geophys, 2005, 23: 2757–2774
Zhang L Q, Liu Z X, Ma Z W, et al. A new processing method for the AE index. Sci China Ser E-Tech Sci, 2008, 51(10), doi: 10.1007/s11431-008-0255-x
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Supported by the National Natural Science Foundation of China (Grant Nos. 40704031, 40674091 and 40536030)
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Zhang, L., Shi, J., Liu, Z. et al. Near-Earth bursty bulk flows and AE index. Sci. China Ser. E-Technol. Sci. 51, 1704–1712 (2008). https://doi.org/10.1007/s11431-008-0256-9
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DOI: https://doi.org/10.1007/s11431-008-0256-9