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Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp

By H. J. Opgenoorth, M. Lockwood, D. Alcaydé, E. Donovan, M. J. Engebretson, A. P. van Eyken, K. Kauristie, M. Lester, J. Moen, J. Watermann, H. Alleyne, M. André, M. W. Dunlop, N. Cornilleau-Wehrlin, A. Masson, A. Fazerkerley, H. Rème, R. André, O. Amm, A. Balogh, R. Behlke, P. L. Blelly, H. Boholm, E. Borälv, J. M. Bosqued, S. Buchert, M. Candidi, J. C. Cerisier, C. Cully, W. F. Denig, P. Eglitis, R. A. Greenwald, B. Jackal, J. D. Kelly, I. Krauklis, G. Lu, I. R. Mann, M. F. Marcucci, I. W. McCrea, M. Maksimovic, S. Massetti, P. M. E. Décréau, D. K. Milling, S. Orsini, F. Pitout, G. Provan, J. M. Ruohoniemi, J. C. Samson, J. J. Schott, F. Sedgemore-Schulthess, R. Stamper, P. Stauning, A. Strömme, M. Taylor, A. Vaivads, J. P. Villain, I. Voronkov, J. A. Wild and M. Wild


On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside magnetopause over Greenland between 13:00 and 14:00 UT. During that interval, a sudden reorganisation of the high-latitude dayside convection pattern accurred after 13:20 UT, most likely caused by a direction change of the Solar wind magnetic field. The result was an eastward and poleward directed flow-channel, as monitored by the SuperDARN radar network and also by arrays of ground-based magnetometers in Canada, Greenland and Scandinavia. After an initial eastward and later poleward expansion of the flow-channel between 13:20 and 13:40 UT, the four Cluster spacecraft, and the field line footprints covered by the eastward looking scan cycle of the Sondre Stromfjord incoherent scatter radar were engulfed by cusp-like precipitation with transient magnetic and electric field signatures. In addition, the EISCAT Svalbard Radar detected strong transient effects of the convection reorganisation, a poleward moving precipitation, and a fast ion flow-channel in association with the auroral structures that suddenly formed to the west and north of the radar. From a detailed analysis of the coordinated Cluster and ground-based data, it was found that this extraordinary transient convection pattern, indeed, had moved the cusp precipitation from its former pre-noon position into the late post-noon sector, allowing for the first and quite unexpected encounter of the cusp by the Cluster spacecraft. Our findings illustrate the large amplitude of cusp dynamics even in response to moderate solar wind forcing. The global ground-based data proves to be an invaluable tool to monitor the dynamics and width of the affected magnetospheric regions

Year: 2001
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Provided by: Lancaster E-Prints

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  1. A global view of the F-region electron density and temperature at solar maximum, doi
  2. (1994). A new mechanism for polar patch formation, doi
  3. (1931). A new theory of magnetic storms. Part I. The initial phase, doi
  4. (1995). A.: Modeling the Earth’s magnetospheric magnetic field confined within a realistic magnetopause, doi
  5. (1991). Acceleration and heating of space plasmas: basic concepts,
  6. (1971). Airbourne observations of auroral precipitation patterns, doi
  7. (1198). AMIE Procedure and its application, in The Satellite Ground-Based Co-H. J. Opgenoorth et al.: Cluster and ground-based observations of a transient cusp event 1397 ordination Source
  8. (1992). Assimilated mapping of ionospheric electrodynamics, doi
  9. (1964). Aurora and airglow intensity variations with time and magnetic activity at southern high-latitudes, doi
  10. (1991). Auroral electrodynamics at the cusp/cleft poleward boundary during northward interplanetary magnetic field, doi
  11. (1993). Characterization of the IMF BY dependent field-aligned currents in the cleft region based doi
  12. (2001). Cluster boundary layer measurements and optical observations at magnetically conjugate sites, Ann. Geophysicae, this issue, doi
  13. (2001). Cluster PEACE observations of electrons during magnetosphere flux transfer events, Ann. Geophysicae, this issue, doi
  14. (1993). Comment on “Mapping the dayside ionosphere to the magnetosphere according to particle precipitation characteristics” by Newell and Meng, doi
  15. (2001). Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during northward IMF, Ann. Geophysicae, this issue, doi
  16. (2001). Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe, Ann. Geophysicae, this issue, doi
  17. (1995). Cusp currents from ionospheric vorticity generated by gasdynamic and merging flow fields at the magnetopause, doi
  18. (2001). d’Humi` eres, E., et al.: A case study of low-frequency waves at the magnetopause, Ann. Geophysicae, this issue,
  19. (1984). Dayside auroras at very highlatitudes: the importance of thermal excitation, doi
  20. DE-2 cusp observations: role of plasma instabilities in topside ionospheric heating and density fluctuations, doi
  21. (1991). Dependence of convective flows and particle precipitation in the high-latitude dayside ionosphere on the X and Y components of the interplanetary magnetic field, doi
  22. (1992). Dynamical auroral structure in the vicinity of the polar cusp: multipoint observations during southward and northward IMF,
  23. (1998). Dynamics of the aurora and associated convection currents during a cusp bifurcation event, doi
  24. (2001). Early results from the WHISPER instrument on Cluster: an overview, Ann. Geophysicae, this issue,
  25. (1997). Energy and pitch angle dispersions of LLBL/cusp ions seen at middle altitudes: predictions by the open magnetosphere model, doi
  26. (2000). ESR and EISCAT observations of the response of the cusp and cleft to IMF orientation changes, doi
  27. (2001). et al.: First results of electric field and density observations by Cluster EFW based on initial months of operation, Ann. Geophysicae, this issue, doi
  28. (1977). Evidence of magnetospheric cusp proton acceleration by magnetic merging at the dayside magnetopause, doi
  29. (2001). First multispacecraft ion measurements in and near the Earth’s magnetosphere with the identical Cluster Ion Spectrometry (CIS) experiment, Ann. Geophysicae, this issue, doi
  30. (2001). First results from the RAPID Imaging /Energetic Particle Spectrometer onboard Cluster, Ann. Geophysicae, this issue, doi
  31. (1993). H.: Ionospheric signatures of pulsed magnetic reconnection at the Earth’s magnetopause, doi
  32. (1980). HEOS-2 observations of the boundary layer from the magnetopause to the ionosphere, doi
  33. (1975). HEOS-2 plasma observations in the distant polar magnetosphere: the plasma mantle, doi
  34. (1995). High spatial and temporal resolution observations of the ionospheric cusp, doi
  35. (1966). Hydromagnetic flow around the magnetosphere, doi
  36. (1972). I.: The morphology of auroral particle precipitation, doi
  37. (1985). IMF By-dependent plasma flow and Birkeland currents in the dayside magnetosphere, 1. Dynamics Explorer Observations, doi
  38. (1198). Incoherent scatter radars, in The Satellite Ground-Based Coordination Sourcebook,
  39. (1991). Ion reflection and transmission during reconnection at the Earth’s subsolar magnetopause, doi
  40. (1976). Ionospheric heating beneath the magnetosphereic cleft, doi
  41. (1198). L.: IMAGE magnetometer network, in The Satellite Ground-Based Coordination Source
  42. (1985). Large- and small-scale dynamics of the polar cusp, doi
  43. (1998). Large-scale imaging of highlatitude convection with Super Dual Auroral Radar Network HF radar observations, doi
  44. (1981). Magnetospheric asymmetries associated with the Y-component of the IMF, doi
  45. (1992). Mapping the dayside ionosphere to the magnetosphere according to particle precipitation characteristics, doi
  46. (1993). Model of magnetosheath plasma in the magnetosphere: cusp and mantle precipitations at low altitudes, doi
  47. (2001). Multi-spacecraft observations of broadband waves near the lower hybrid frequency at the Earthward edge of the magnetopause, Ann. Geophysicae, this issue, doi
  48. (1995). Multiple-branch model of the open magnetopause, doi
  49. (1997). Northward interplanetary magnetic field cusp aurora and high-latitude magnetopause reconnection, doi
  50. (1993). Observations of an enhanced convection channel in the cusp ionosphere, doi
  51. Observations of substorm electrodynamics using the MIRACLE network, in doi
  52. (1998). On the Cause of a Magnetospheric Flux Transfer Event, doi
  53. (1996). On the longitudinal extent of magnetopause reconnection bursts, doi
  54. (1991). Opening the cusp, doi
  55. (1999). Opgenoorth et al.: Cluster and ground-based observations of a transient cusp event IMF,
  56. (1997). Opportunities for magnetospheric research with coordinated Cluster and Ground-Based Observations, Space Sci. doi
  57. (1992). Orbit visualization tool, User’s Guide, Version 1.1, ESA/ESTEC,
  58. (1971). Penetration of magnetosheath plasma to low altitudes through the dayside magnetospheric cusps, doi
  59. (1990). Pi2 pulsation polarization patterns on the UK sub-auroral magnetometer network (SAMNET), doi
  60. (1990). Plasma flow reversals at the dayside magnetopause and the origin of asymmetric polar cap convection, doi
  61. Plasma injection and transport in the mid-altitude polar cusp, doi
  62. (2000). Plasma structure within polewardmoving cusp/cleft auroral transients: EISCAT Svalbard Radar observations and an explanation in terms of large local time extent of events, doi
  63. (1971). Plasmas in the Earth’s polar magnetosphere, doi
  64. (1986). Poleward progressing quasiperiodic disturbances at cusp latitudes: the role of wave processes, doi
  65. (1996). Predicted signatures of pulsed reconnection doi
  66. (1995). Progressing IMF BY-related polar ionospheric convection disturbances, doi
  67. (1994). Progressing polar convection disturbances: Signature of an open magnetosphere, doi
  68. (1999). Reconfiguration and closure of lobe flux by reconnection during northward IMF: possible evidence for signatures in cusp/cleft auroral emissions, doi
  69. (1993). Relationship between Birkeland current regions, particle participation, and electric fields, doi
  70. (1997). Simultaneous observations of the cusp in optical, DMSP, and HF radar data, doi
  71. (2000). Simultaneous optical and radar signatures of poleward-moving auroral forms, doi
  72. (1990). Simultaneousconjugateobservationsofdynamicvariationsinhigh-latitude dayside convection due to changes in doi
  73. (1977). Solar wind plasma injection at the dayside magnetospheric cusp, doi
  74. (1989). Some low-altitude cusp dependencies on the interplanetary magnetic field, doi
  75. (1992). Staircase ion signature in the polar cusp: a case study, doi
  76. The causes of convection in the Earth’s magnetosphere: A review of developments during IMS, doi
  77. (1994). The characteristics of the magnetopause reconnection X-line deduced from low-altitude satellite observations of cusp ions, doi
  78. (2001). The Cluster magnetic field investigation: overview of in-flight performance and initial results, Ann. Geophysicae, this issue, doi
  79. (1988). The cusp and the cleft/LLBL: Low altitude identification and statistical local time variation, doi
  80. (1998). The dayside aurora and its regulation by the interplanetary magnetic field, in Polar cap boundary phenomena, doi
  81. (1994). The dynamic cusp at low altitudes: a case study utilizing Viking, DMSP-D7, and Sondrestrom incoherent scatter radar observations, doi
  82. (1996). The Earth’s magnetospheric cusps, doi
  83. (1990). The electron edge of the low-latitude boundary layer during accelerated flow events, doi
  84. (1978). The frontside boundary layer of the magnetopause and the problem of reconnection, doi
  85. (1993). The implications of the altitude of transient 630nm dayside auroral emissions, doi
  86. (1997). The ionospheric response to flux transfer events: the first few minutes, doi
  87. (1991). The ionospheric signature of flux transfer events,
  88. (1995). The location and characteristics of the reconnection X-line deduced from low-altitude satellite and ground-based observations: 1. doi
  89. (1995). The occurrence probability, width and terracing of cusp precipitation in the topside ionosphere for fully-pulsed reconnection at the dayside magnetopause, doi
  90. (1996). The origin of cusp Birkeland currents, doi
  91. (1997). The relationship of dayside auroral precipitations to the open-closed separatrix and the pattern of convective flow, doi
  92. (1995). The Sondrestrom radar and accompanying ground-based instrumentation, doi
  93. (1992). The variation of reconnection rate at the dayside magnetopause and cusp ion precipitation, doi
  94. (1991). Variability of the interplanetary medium at 1 AU over 24 years: 1963–1986, Planet. doi
  95. (1995). Yamagishi: DARN/SuperDARN: A global view of the dynamics of high-latitude convection, doi

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