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Auroral streamers and magnetic flux closure

By B. Hubert, K. Kauristie, O. Amm, Steve E. Milan, Adrian Grocott, S. W. H. Cowley and T. I. Pulkkinen

Abstract

On 7 December 2000 at 2200 UT an auroral streamer was observed to develop above Scandinavia with the IMAGE-FUV global imagers. The ionospheric equivalent current deduced from the MIRACLE-IMAGE Scandinavian ground-based network of magnetometers is typical of a substorm-time streamer. Observations of the proton aurora using the SI12 imager onboard the IMAGE satellite are combined with measurements of the ionospheric convection obtained by the SuperDARN radar network to compute the dayside merging and nightside flux closure rates. On the basis of this and other similar events, it is found that auroral streamers appear during the period of most intense flux closure in the magnetotail, most often shortly after substorm onset. The ionospheric convection velocity, as measured by SuperDARN, appears to be reduced in the vicinity of the streamer, suggesting de-coupling of magnetospheric and ionospheric plasma flows in the region of enhanced ionospheric conductance

Publisher: American Geophysical Union (AGU)
Year: 2007
DOI identifier: 10.1029/2007GL030580
OAI identifier: oai:lra.le.ac.uk:2381/7863
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Citations

  1. (2006a), Dayside and nightside reconnection rates inferred from IMAGE-FUV and SuperDARN data, doi
  2. (1979). Analysis of an eastward electrojet by means of upward continuation of groundbased magnetometer data,
  3. (2004). Auroral streamers: Characteristics of associated precipitation, convection and field-aligned currents, doi
  4. (1997). Braking of highspeed flows in the near-Earth tail, doi
  5. (1992). bulk flows in the inner central plasmasheet, doi
  6. (2003). Bursty bulk flow intrusion to the inner plasma sheet as inferred from auroral observations, doi
  7. (1973). Can the ionosphere regulate magnetospheric convection?, doi
  8. (1999). Earthward flow bursts in the inner magnetotail and their relation to auroral brightening, AKR intensifications, geosynchronous particle injections and magnetic activity, doi
  9. (2000). Far ultraviolet imaging from the IMAGE spacecraft: 3. Spectral imaging of Lyman alpha and OI 135.6 nm, doi
  10. (1993). Interpretation of high-speed flows in the plasma sheet, doi
  11. (1999). Ionospheric disturbance magnetic field continuation from the ground to the ionosphere using spherical elementary current systems, doi
  12. (2002). Ionospheric signatures of bursty bulk flows, doi
  13. (1998). Large scale imaging of highlatitude convection with Super Dual Auroral Radar Network HF radar observations, doi
  14. shocks directly drives transient magnetic flux closure, doi
  15. (1987). Simple models of timedependent reconnection in a collision-free plasma with an application to substorms in the geomagnetic tail, doi
  16. (1999). Spatial distribution of conductances and currents associated with north-south auroral form during a multiple-substorm period, doi
  17. (1999). Theory of thin-filament motion in Earth’s magnetotail and its application to bursty bulk flows, doi

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