Location of Repository

Modulation of dayside reconnection during northward interplanetary magnetic field

By G. P. Provan, M. Lester, S. W. H. Cowley, Adrian Grocott, Steve E. Milan, B. Hubert and H. Khan


On 17 September 2000 the IMF was directed continuously northward for more than 3 hours. Density fluctuations in the solar wind resulted in quasiperiodic variations in the solar wind dynamic pressure, and correlated fluctuations also occurred in the IMF Bz component. The Northern Hemisphere SuperDARN radars observed bursts of high-latitude high-velocity plasma flow during this northward IMF interval, both when ionospheric signatures consistent with low-latitude merging were observed and when lobe merging was occurring. On average the recurrence period of these flow bursts was ∼22 min. During this time the SI-12 spectrographic imager channel on the IMAGE spacecraft observed the dayside proton auroral spot continuously (Frey et al., 2003a). The brightness of the auroral spot varied over time. Here we find a direct correlation between the occurrence of bursts of plasma flow and periodic fluctuations in the brightness of the proton auroral spot. Our results suggest that correlated fluctuations in the solar wind dynamic pressure and IMF Bz component modulated ionospheric precipitation and dayside reconnection, resulting in fluctuations in the brightness of the proton auroral spot and periodic variations in the dayside high-latitude plasma flow

Publisher: American Geophysical Union (AGU)
Year: 2005
DOI identifier: 10.1029/2004JA010980
OAI identifier: oai:lra.le.ac.uk:2381/7922

Suggested articles



  1. (2000a), Dayside convection and auroral morphology during an interval of northward interplanetary magnetic field, doi
  2. (2000a), Far ultraviolet imaging from the IMAGE spacecraft: 1. System design, doi
  3. (2000b), Convection and auroral response to a southward turning of the IMF: POLAR UVI, CUTLASS and IMAGE signatures of transient magnetic flux transfer at the magnetopause, doi
  4. (2000b), Far ultraviolet imaging from the IMAGE spacecraft: 3. Spectral imaging of Lyman alpha and OI 135.6 nm, doi
  5. (2000). A statistical survey of dayside pulsed ionospheric flows as seen by the CUTLASS Finland HF radar, doi
  6. (1993). Auroral event sequence at the dayside polar cap boundary: Signature of time-varying solar wind-magnetosphere-ionosphere coupling, doi
  7. (1985). By-dependent dayside plasma flow and Birkeland currents in the dayside magnetosphere: 2. A global model for northward and southward IMF, doi
  8. (2004). Cluster observations of quasi-periodic impulsive signatures in the dayside northern lobe: High-latitude flux transfer events?, doi
  9. (2002). Cusp aurora dependence on interplanetary magnetic field Bz,
  10. (1994). Cusp/cleft auroral activity in relation to solar wind dynamic pressure, interplanetary magnetic field Bz and By, doi
  11. (1998). CUTLASS Finland Radar observations of the ionospheric signatures of flux transfer events and the resulting plasma flows, doi
  12. (1995). Darn/SuperDARN: A global view of the dynamics of high-latitude convection, doi
  13. (1991). Dependence of convective flows and particle-precipitation in the high-latitude dayside ionosphere on the x and y components of the interplanetary magneticfield, doi
  14. (2000). Dynamic cusp aurora and associated pulsed reverse convection during northward IMF, doi
  15. (1998). Dynamics of the aurora and associated convection during a cusp bifurcation event, doi
  16. (2002). Electron and proton excitation of the FUV aurora: doi
  17. (1992). Excitation and decay of solar wind-driven flows in the magnetosphere-ionosphere system, doi
  18. (1995). High spatial and temporal resolution observations of the ionospheric cusp, doi
  19. (1988). High-latitude dayside electric fields and currents during strong northwards interplanetary magnetic field: Observation and model simulation, doi
  20. (1991). Ionospheric convection response to changing IMF direction, doi
  21. (1986). Ionospheric convection signatures observed by DE2 during northward interplanetary magnetic field, doi
  22. (1998). Large-scale imaging of highlatitude convection with Super Dual Auroral Radar Network HF radar observations, doi
  23. (2004). Measuring the dayside reconnection rate during an interval of due northward interplanetary magnetic field, doi
  24. Mende (2003a), Continuous magnetic reconnection at Earth’s magnetopause, doi
  25. (2001). Observations of two complete substorm cycles during the Cassini Earth swing-by: Cassini magnetometer data in a global context, doi
  26. (1993). of a magnetic cloud with the Earth: Ionospheric convection in the Northern and Southern hemispheres for a wide range of quasi-steady interplanetary magnetic conditions, doi
  27. Østgaard (2003b), Proton aurora in the cusp during southward IMF,
  28. (2002). Proton aurora in the cusp, doi
  29. (2004). Pulsed flows at the high-altitude cusp poleward boundary, and associated ionospheric convection and particle signatures, during a Cluster-FAST-SuperDARN-Sondrestrom conjunction under a southwest IMF, doi
  30. (2005). Pulsed flows observed during an interval of prolonged northward IMF, doi
  31. (1995). Reconnection-associated auroral activity stimulated by two types of upstream dynamic pressure variations: Interplanetary magnetic field Bz 0, By 0 case, doi
  32. Research and Scientific Support Department,
  33. (2004). Statistical study of high-latitude plasma flow during magnetospheric substorms, doi
  34. (2000). Super Dual Auroral Radar Network observations of ionospheric multicell convection during northward interplanetary magnetic field, doi
  35. (1995). Super dual auroral radar network radar imaging of dayside high-latitude convection under northward interplanetary magnetic field: Toward resolving a distorted two-cell versus multicell controversy, doi
  36. (1999). The ACE magnetic field experiment, doi
  37. (1997). The ionospheric response to flux transfer events: The first few minutes, doi
  38. (1993). The response of the large-scale ionospheric convection pattern to changes in the IMF and substorms: Results from the SUNDIAL
  39. (2001). The role of proton precipitation in the excitation of auroral FUV emissions, doi

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