Skip to main content
Article thumbnail
Location of Repository

Multi-scale observations of magnetotail flux transport during IMF-northward non-substorm intervals

By Adrian Grocott, Tim K. Yeoman, Steve E. Milan, O. Amm, H.U. Frey, L. Juusola, R. Nakamura, C.J. Owen, H. Rème and T. Takada

Abstract

This paper was published as Annales Geophysicae, 2007, 25 (7), pp. 1709-1720. Copyright 2007 European Geosciences Union. It is also available from http://www.ann-geophys.net/25/1709/2007/angeo-25-1709-2007.html.Simultaneous observations by the Cluster spacecraft and SuperDARN radars are presented of magnetotail flux transport during northward, but BY-dominated IMF. Two events are discussed, which occurred on 14 August 2004 and 17 September 2005, during intervals of negative and positive IMF BY, respectively. During both intervals the Cluster spacecraft observed isolated bursts of Earthward plasma convection in the central plasma sheet. During the first event, the flows observed by Cluster also had a significant V⊥Y component in the duskward direction, consistent with westward azimuthal flows observed in the midnight sector by the Northern Hemisphere SuperDARN radars. During the second event, Cluster 4 observed a significant dawnward V⊥Y component, again consistent with the Northern Hemisphere SuperDARN observations which revealed eastward azimuthal flow. In this instance, however, Cluster 3 observed a duskward V⊥Y component which was more consistent with the duskward sense of the convection observed by the Southern Hemisphere SuperDARN radars. This implies that Cluster 3 and Cluster 4 were located on different field lines which experienced opposite net azimuthal forces and hence observed oppositely directed convection. These observations are consistent with previous SuperDARN studies of nightside flows under northward IMF and, more importantly, provide the first simultaneous in-situ evidence for a mode of tail reconnection occurring during non-substorm intervals in an asymmetric tail

Publisher: Copernicus Publications on behalf of the European Geosciences Union
Year: 2007
DOI identifier: 10.5194/angeo-25-1709-2007
OAI identifier: oai:lra.le.ac.uk:2381/7851
Journal:

Suggested articles

Citations

  1. (2001). 1720 A. Grocott et al.: Magnetotail flux transport during IMF-northward non-substorm intervals http://www.ann-geophys.net/19/1303/2001/. doi
  2. (1998). A unifield model of the magnetotail convection in geomagnetically quiet and active times, doi
  3. (1995). A.: Modeling the Earth’s magnetospheric magnetic field confined within a realistic magnetopause, doi
  4. (1998). Are northsouth aligned auroral structures an ionospheric manifestation of bursty bulk flows?, doi
  5. (1999). Association between Geotail plasma flows and auroral poleward boundary intensifications observed by CANOPUS photometers, doi
  6. (1992). Bursty bulk flows in the central plasma sheet, doi
  7. (1994). By -controlled convection and field-aligned currents near midnight auroral oval for northward interplanetary magnetic field, doi
  8. (1992). By -controlled field-aligned currents near midnight auroral oval during northward interplanetary magnetic field, doi
  9. (1990). Characteristics of high-speed flows in the plasma sheet, doi
  10. Cluster and Double Star observations of dipolarization, doi
  11. (1998). Dayside auroral configurations: Responses to southward and northward rotations of the interplanetary magnetic field, doi
  12. (1996). Detection of localized, plasma-depleted flux tubes or bubbles in the midtail plasma sheet, doi
  13. (2001). Earthward flow bursts, auroral streamers, and small expansions, doi
  14. (2000). Electrostatic potential patterns in the high-latitude ionosphere constrained by SuperDARN measurements, doi
  15. (1987). Empirical high-latitude electric field models, doi
  16. Far ultraviolet imaging from the IMAGE spacecraft. 2. Wideband FUV imaging, doi
  17. (2005). Formation and motion of a transpolar arc in response to dayside and nightside reconnection, doi
  18. (2005). Interhemispheric observations of the ionospheric signature of tail reconnection during IMF-northward non-substorm intervals, doi
  19. (1961). Interplanetary magnetic field and the auroral zones, doi
  20. (1985). Interplanetary magnetic field control of high-latitude electric fields and currents determined from Greenland magnetometer data, doi
  21. (1999). Ionospheric disturbance magnetic field continuation from the ground to the ionosphere using spherical elementary current systems, doi
  22. (2003). Ionospheric flows and magnetic disturbance during extended intervals of northward but By -dominated IMF, doi
  23. (1996). Ionospheric plasma convection in the midnight sector for northward interplanetary magnetic field, doi
  24. (2002). Ionospheric signatures of bursty bulk flows, doi
  25. (1998). Large-scale imaging of highlatitude convection with Super Dual Auroral Radar Network HF radar observations, doi
  26. Localized fast flow disturbance observed in the plasma sheet and in the ionosphere, doi
  27. (1997). Magnetotail flow bursts: association to global magnetospheric circulation, relationship to ionospheric activity and direct evidence for localization, doi
  28. Multi-instrument observations of the ionospheric counterpart to a bursty bulk flow in the nearEarth plasma sheet, doi
  29. (1996). Neutral line model of substorms: Past results and present view, doi
  30. (1990). Non-substorm short-lived injection events in the ionosphere and magnetosphere, doi
  31. (2000). Observations of the response time of high latitude ionospheric convection to variations in the interplanetary magnetic field using EISCAT and IMP-8 data, doi
  32. (2001). Rapid flux transport and plasma sheet reconfiguration, doi
  33. (1998). Rapid flux transport in the central plasma sheet, doi
  34. (1998). Solar Wind Electron Proton Alpha Monitor (SWEPAM) for the Advanced Composition Explorer, Space Sci. doi
  35. (2006). Spaceand ground-based investigations of solar wind-magnetosphereionosphere coupling, doi
  36. (1994). Statistical characteristics of bursty bulk flow events, doi
  37. (1996). Statistical patterns of high-latitude convection obtained from Goose Bay HF radar observations, doi
  38. (2004). Statistical study of high-latitude plasma flow during magnetospheric substorms, doi
  39. (1998). Structure and dynamics of magnetic reconnection for substorm onsets with Geotail observations, doi
  40. (1994). Structure of the neutral sheet in the distant tail (x=-210Re) in geomagnetically quiet times, doi
  41. System design,
  42. (1998). The Advanced Composition Explorer, Space Sci. doi
  43. (2001). The Cluster magnetic field investigation: Overview of in-flight performance and initial results, doi
  44. (2005). The Double Star mission, doi
  45. (1993). The Earth’s magnetosphere under continued forcing: Substorm activity during the passage of an interplanetary magnetic cloud, doi
  46. The influence of IMF By on the nature of the nightside high-latitude ionospheric flow during intervals of positive doi
  47. (1979). Transient phenomena in the magnetotail and their relation to substorms, Space Sci. doi
  48. (1998). Westward moving dynamic substorm features observed with the IMAGE magnetometer network and other ground-based instruments, doi
  49. (2007). www.ann-geophys.net/25/1709/2007/ A. Grocott et al.: Magnetotail flux transport during IMF-northward non-substorm intervals 1719

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.