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Science China Technological Sciences

, Volume 59, Issue 10, pp 1591–1596 | Cite as

Statistical study of magnetotail flux ropes near the lunar orbit

  • SiQi Zhao
  • AnMin TianEmail author
  • QuanQi Shi
  • ChiJie Xiao
  • SuiYan Fu
  • QiuGang Zong
  • HuiZi Wang
  • Shuai Zhang
  • ShaoJie Zhao
  • DongXiao Pan
  • ShangChun Teng
  • YiXing Liu
  • Kun Tan
Article
  • 64 Downloads

Abstract

Flux-rope/TCR events near the magnetotail lunar orbit (−67R E < GSM X* < −39R E) were studied using magnetic-field and plasma data measured by THEMIS B and C between January 2011 and March 2012. The aberrant coordinate GSM*, where the X* axis is rotated 4° relative to GSM-X, was used to count the occurrence rate. The number ratio of earthward to tailward events was about 3:5. Moreover, the event occurrence rate distribution showed a clear dawn-dusk asymmetry distribution, with dusk-side events accounting for 57.98%. A superposed epoch analysis of the flux-rope events showed that earthward events had a shorter duration in the leading than in the trailing part. Earthward events also displayed a lower temperature and a lower flow speed than tailward events. We studied the relationship between the event occurrence rate and geomagnetic activity level even further. The occurrence rate of tailward flux-rope/TCR events increases with increasing AE-index, whereas earthward events occur mainly in the relatively quiet period of geomagnetic activity (AE ∼ 100–00 nT). Flux-rope/TCR events identified within a 10 mm time frame were treated as belonging to a single reconnection event. By comparing the occurrence rates of earthward and tailward events along X*, we estimated the most likely location of the near-Earth reconnection site as X* = −36R E.

Keywords

magnetotail flux rope TCR dawn-dusk asymmetry reconnection site 

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References

  1. 1.
    Hones E W. Substorm processes in the magnetotail: Comments on “On hot tenuous plasma, fireballs, and boundary layers in the Earth’s magnetotail-by Frank L A, Ackerson K L, Lepping R P. J Geophys Res, 1977, 82: 5633–5640CrossRefGoogle Scholar
  2. 2.
    Hughes W J, Sibeck D G. On the 3-dimensional structure of plasmoids. Geophys Res Lett, 1987, 14: 636–639CrossRefGoogle Scholar
  3. 3.
    Moldwin M B, Hughes W J. On the formation and evolution of plasmoids: A survey of ISEE 3 Geotail data. J Geophys Res, 1992, 97: 19259–19282CrossRefGoogle Scholar
  4. 4.
    Ieda A, Machida S, Mukai T, et al. Statistical analysis of plasmoid evolution with Geotail observations. J Geophys Res, 1998, 103: 4453–4465CrossRefGoogle Scholar
  5. 5.
    Slavin J A, Smith E J, Tsurutani B T, et al. Substorm associated traveling compression regions in the distant tail: ISEE– Geotail observations. Geophys Res Let, 1984, 11: 657–660CrossRefGoogle Scholar
  6. 6.
    Slavin J A, Tanskanen E I, Hesse M, et al. Cluster observations of traveling compression regions in the near-tail. J Geophys Res, 2005, 110: A06207CrossRefGoogle Scholar
  7. 7.
    Lee L C, Fu Z F, Akasofu S I. A simulation study of forced reconnection processes and 238 magnetospheric storms and substorms. J Geophys Res, 1985, 90: 10896–10910CrossRefGoogle Scholar
  8. 8.
    Lee L C, Ma Z, Otto A. Topology of magnetic flux ropes and formation of fossil flux transfer events and boundary layer plasmas. J Geophys Res, 1993, 98: 3943–3951CrossRefGoogle Scholar
  9. 9.
    Zong Q G, Fritz T A, Pu Z Y, et al. Cluster observations of earthward flowing plasmoid in the tail. J Geophys Res, 2004, 31: L18803Google Scholar
  10. 10.
    Nakamura M, Scholer M. Structure of the magnetopause reconnection layer and of flux 235 transfer events: Ion kinetic effects. J Geophys Res, 2000, 105: 23179–23191CrossRefGoogle Scholar
  11. 11.
    Borg A L, Taylor M G G T, Eastwood J P. Observations of magnetic flux ropes during magnetic reconnection in the Earth’s magnetotail. Ann Geophys, 2012, 30: 761–773CrossRefGoogle Scholar
  12. 12.
    Angelopoulos V, Kennel C F, Coroniti F V, et al. Statistical characteristics of bursty bulk flow events. J Geophys Res, 1994, 99: 21257–21280CrossRefGoogle Scholar
  13. 13.
    Nagai T, Machida S. Magnetic Reconnection in the Near-Earth Magnetotail. In: New Perspectives on the Earth’s Magnetotail. Washington: American Geophysical Union, 1998. 211–224CrossRefGoogle Scholar
  14. 14.
    Raj A, Phan T, Lin R P, et al. Wind survey of high-speed bulk flows and field-aligned beams in the near-Earth plasma sheet. J Geophys Res, 2002, 107: 1419CrossRefGoogle Scholar
  15. 15.
    Imber S M, Slavin J A, Auster H U, et al. ATHEMIS survey of flux ropes and traveling compression regions: Location of the near-Earth reconnection site during solar minimum. J Geophys Res, 2011, 116: A02201CrossRefGoogle Scholar
  16. 16.
    Li S S, Angelopoulos V, Runov A, et al. Azimuthal extent and properties of mid-tail plasmoids from two-point ARTEMIS observations at the Earth-Moon Lagrange points. J Geophys Res, 2014, 119: 1781CrossRefGoogle Scholar
  17. 17.
    Nagai T, Shinohara I, Zenitani S, et al. Three-dimensional structure of magnetic reconnection in the magnetotail from Geotail observations. J Geophys Res, 2013, 118: 1667–1678CrossRefGoogle Scholar
  18. 18.
    Sibeck D G, Angelopoulos V. THEMIS science objectives and mission phases. Space Sci Rev, 2008, 141: 35–59CrossRefGoogle Scholar
  19. 19.
    Angelopoulos V. The ARTEMIS mission. Space Sci Rev, 2010, 165: 1–23MathSciNetGoogle Scholar
  20. 20.
    Nagai T. Location of magnetic reconnection in the magnetotail. Space Sci Rev, 2006, 122: 39–54CrossRefGoogle Scholar
  21. 21.
    Auster H U, Glassmeier K H, Magnes W, et al. The THEMIS fluxgate magnetometer. Space Sci Rev, 2008, 141: 235–264CrossRefGoogle Scholar
  22. 22.
    McFadden J P, Carlson C W, Larson D, et al. The THEMIS ESA plasma instrument and in-flight calibration. Space Sci Rev, 2008, 141: 277–302CrossRefGoogle Scholar
  23. 23.
    Slavin J A, Lepping R P, Gjerloev J, et al. Geotail observations of magnetic flux ropes in the plasma sheet. J Geophys Res, 2003, 108: 1015CrossRefGoogle Scholar
  24. 24.
    Shue J H, Sibeck D G, McFadden J P, et al. Magnetopause location under extreme solar wind conditions. J Geophys Res, 1998, 103: 17691–17700CrossRefGoogle Scholar
  25. 25.
    Tian A M, Shi Q Q, Zong Q G, et al. Analysis of magnetotail flux rope events by ARTEMIS observations. Sci China Tech Sci, 2014, 57: 1010–1019CrossRefGoogle Scholar
  26. 26.
    Cattle C A, Mozer F S. Magnetic reconnection in space and laboratory plasma. Geophys, 1984, 30: 208–215Google Scholar
  27. 27.
    Nagai T, Fujimoto M, Saito Y, et al. Structure and dynamics of magnetic reconnection for substorm nosets with Geotail observations. J Geophys Res, 1998, 103: 4419–4440CrossRefGoogle Scholar
  28. 28.
    Nagai T, Fujimoto M, Nakamura R, et al. Solar wind control of the radial distance of the magnetic reconnection site in the magnetotail. J Geophys Res, 2005, 110: A09208CrossRefGoogle Scholar

Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • SiQi Zhao
    • 1
    • 2
  • AnMin Tian
    • 1
    Email author
  • QuanQi Shi
    • 1
  • ChiJie Xiao
    • 2
  • SuiYan Fu
    • 3
  • QiuGang Zong
    • 3
  • HuiZi Wang
    • 1
  • Shuai Zhang
    • 1
  • ShaoJie Zhao
    • 1
  • DongXiao Pan
    • 3
  • ShangChun Teng
    • 1
  • YiXing Liu
    • 1
  • Kun Tan
    • 1
  1. 1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and PhysicsShandong UniversityWeihaiChina
  2. 2.School of PhysicsPeking UniversityBeijingChina
  3. 3.School of Earth and Space SciencePeking UniversityBeijingChina

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