Volume 32 Issue 6
Nov.  2012
Turn off MathJax
Article Contents
SHENG Cheng, FU Suiyan, ZHENG Hao, BAI Xi, YANG Biao, WANG Yongfu. Variation of the Bz Component of Magnetic Field During the Front of Bursty Bulk Flows[J]. Chinese Journal of Space Science, 2012, 32(6): 793-803. doi: 10.11728/cjss2012.06.793
Citation: SHENG Cheng, FU Suiyan, ZHENG Hao, BAI Xi, YANG Biao, WANG Yongfu. Variation of the Bz Component of Magnetic Field During the Front of Bursty Bulk Flows[J]. Chinese Journal of Space Science, 2012, 32(6): 793-803. doi: 10.11728/cjss2012.06.793

Variation of the Bz Component of Magnetic Field During the Front of Bursty Bulk Flows

doi: 10.11728/cjss2012.06.793
  • Received Date: 2011-05-26
  • Rev Recd Date: 2012-04-28
  • Publish Date: 2012-11-15
  • Bursty Bulk Flows (BBFs) play an important role in the magnetotail activites. The formation mechanism of BBFs and the interaction between BBFs and the ambient plasma have become important research subjects recently. Based on the observations made by Cluster during the periods from July to October 2001 and 2002, the variations of magnetic field during the passage of BBFs are statistically analyzed. Superposed epoch analyses show that there is a sharp change in the Bz component as the bulk speed of the flow begins to increase at the front of BBFs: a sharp increase preceded by a transient decrease. This signature in Bz component was found in most of the BBFs events observed by Cluster, which is generally agreed with the result reported based on Geotail observations. However, the change of Bz component is not always symmetry, and the decease of Bz is usually not strong enough to lead to a negative value. This implied that magnetic structure does not always occur together with BBFs. The interaction between BBFs and ambient plasma is responsible for the change in Bz. After the dipolarization front is formed, the diamagnetic effect due to the hot ions bouncing back from the boundary might contribute to the decrease in Bz. The pile-up of the magnetic flux carried by BBFs may be the reason for the increase.

     

  • loading
  • [1]
    Angelopoulos V, Baumjohann W, Kennel C F, et al. Bursty bulk flows in the inner central plasma sheet[J]. J. Geophys. Res., 1992, 97:4027-4039
    [2]
    Angelopoulos V, Coroniti F V, Kennel C F, et al. Multipoint analysis of a bursty bulk flow event on April 11, 1985[J]. J. Geophys. Res., 1996, 101:4967-4989
    [3]
    Ohtani S, Shay M A, Mukai T. Temporal structure of the fast convective flow in the plasma sheet: Comparison between observations and two-fluid simulation[J]. J. Geophys. Res., 2004, 109, A03210, doi:10.1029/ 2003JA010002
    [4]
    Slavin J A, Lepping R P, Gjerloev J, et al. Geotail observations of magnetic flux ropes in the plasma sheet[J]. J. Geophys. Res., 108(A1), 1015, doi:10.1029/ 2002JA009557, 2003
    [5]
    Runov A, Angelopoulos V, Sitnov M I, et al. THEMIS observations of an earthward- propagating depolarization front[J]. Geophys. Res. Lett., 36, L14106, doi:10.1029/ 2009GL038980
    [6]
    Runov A, Angelopoulos V, Sitnov M, et al. Dipolarization fronts in the magnetotail plasma sheet[J]. Planet. Space Sci., 2010, doi: 10.1016/j.pss.2010.06.006
    [7]
    Sormakov D A, Sergeev V A. Topology of magnetic flux ropes in the magnetospheric plasma sheet as measured by the Geotail spacecraft[J]. Cosmic Res., 2008, 46(5):387-391
    [8]
    Cao J B, Ma Y D, Parks G, et al. Joint observations by Cluster satellites of bursty bulk flows in the magnetotail[J]. J. Geophys. Res., 2006, 111, A04206, doi: 10.1029/2005JA011322
    [9]
    Shue J H, Ieda A, Lui A T Y, et al. Two classes of earthward fast flows in the plasma sheet[J]. J. Geophys. Res., 113, A02205, doi: 10.1029/2007JA012456
    [10]
    Ma Y D, Cao J B, Nakamura R, et al. Statistical analysis of earthward flow bursts in the inner plasma sheet during substorms[J]. J. Geophys. Res., 114, A07215, doi: 10.1029/2009JA014275
    [11]
    Panov E V, Nakamura R, Baumijohann W, et al. Multiple overshoot and rebound of a bursty bulk flow[J]. Geophys. Res. Lett., 2010, 37, L08103, doi: 10.1029/2009GL041971
    [12]
    Ma Y D, Cao J B, Reme H, et al. The radial evolution of earthward BBFs during substorm[J]. Sci China Earth Sci., 2010, 53:1542-1551, doi: 10.1007/s11430-010-4040-x
    [13]
    Reme H, Aoustin C, et al. First multisapacecraft ion measurements in and near the Earth's magnetosphere with the identical Cluster Ion Spectrometry (CIS) experiment[J]. Ann. Geophys., 2001, 19:1303-1354
    [14]
    Wilken B, Guttler W, Korth A, et al. RAPID the imaging energetic particle spectrometer on Cluster[J]. Space Sci. Rev., 1997, 79:399-473
    [15]
    Balogh A H, Carr C M, Acuna M H, et al. The cluster magnetic field investigation: Overview of in-flight performance and initial results[J]. Ann. Geophys., 2001, 19:1207-1217
    [16]
    Zhou X Z, Angelopoulos E V, Sergeev V, Runov A. Accelerated ions ahead of Earthward-propagating dipolarization fronts[J]. J. Geophys. Res., 2010, 115, A00103, doi: 10.1029/2010JA015481
    [17]
    Zhou X Z, Angelopoulos V, Sergeev V, Runov A. On the nature of precursor flows upstream of advancing dipolarization fronts[J]. J. Geophys. Res., 2011, 116, A03222, doi: 10.1029/2010JA016165
    [18]
    Nakamura R, Baumihohann W, Klecher B, et al. Motion of the dipolarization front during a flow burst event observed by Cluster[J]. Geophys. Res. Lett., 2002, 29(20):1942
    [19]
    Nakamura R, Baumihohann W, Zhang T L, et al. Cluster and Double Star observations of dipolarization[J]. Ann. Geophys., 2005, 23:2915-2920
    [20]
    Shiokawa K, Miyashita Y, Shinohara I, Matsuoka A. Decrease in B_z prior to the dipolarization in the near-Earth plasma sheet[J]. J. Geophys. Res., 2005, 110, A09219, doi: 10.1029/2005JA011144
    [21]
    Henderson P D, Owen C J, Alexeev I V, et al. Cluster observations of flux rope structures in the near-tail[J]. Ann. Geophys., 2006, 24:651-666
    [22]
    Sergeev V, Angelopoulos V, Apatenkov S, et al. Kinetic structure of the sharp injection/dipolarization front in the flow-braking region[J]. Geophys. Res. Lett., 36, L21105, doi: 10.1029/2009GL040658
    [23]
    Zhou M, Ashour-Abdalla M, Deng X, et al. THEMIS observation of multiple dipolarization fronts and associated wave characteristics in the near-Earth magnetotail[J]. Geophys. Res. Lett., 2009, 36, L20107, doi: 10.1029/2009GL040663
    [24]
    Deng X, Ashour-Abdalla M, Zhou M, et al. Wave and particle characteristics of earthward electron injections associated with dipolarization fronts[J]. J. Geophys. Res., 2010, 115, A09225, doi: 10.1029/2009JA015107
    [25]
    Zhang X J, Angelopoulos V, Runov A, et al. Current carriers near dipolarization fronts in the magnetotail: A THEMIS event study[J]. J. Geophys. Res., 2011, 116, A00I20, doi: 10.1029/2010JA015885
    [26]
    Fu H S, Khotyaintsev Y V, Andre M, et al. Fermi and betatron acceleration of suprathermal electrons behind dipolarization fronts[J]. Geophys. Res. Lett., 2011, 38, L16104, doi: 10.1029/2011GL048528
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Article Metrics

    Article Views(2341) PDF Downloads(1041) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return