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Dayside flow bursts and high-latitude reconnection when the IMF is strongly northward

By H. Hu, Tim K. Yeoman, M. Lester, R. Liu, H. Yang and Adrian Grocott


The characteristics of dayside ionospheric convection are studied using Northern Hemispheric SuperDARN data and DMSP particle and flow observations when the interplanetary magnetic field (IMF) was strongly northward during 13:00–15:00 UT on 2 March 2002. Although IMF Bx was positive, which is believed to favour Southern Hemisphere high-latitude reconnection at equinox, a four-cell convection pattern was observed and lasted for more than 1.5 h in the Northern Hemisphere. The reconnection rate derived from an analysis of the Northern Hemisphere SuperDARN data illustrates that the high-latitude reconnection was quasi-periodic, with a period between 4–16 min. A sawtooth-like and reverse-dispersed ion signature was observed by DMSP-F14 in the sunward cusp convection at around 14:41 UT, confirming that the high-latitude reconnection was pulsed. Accompanying the pulsed reconnection, strong antisunward ionospheric flow bursts were observed in the post-noon LLBL region on closed field lines, propagating with the same speed as the plasma convection. DMSP flow data show that a similar flow pattern and particle precipitation occurred in the conjugate Southern Hemisphere

Publisher: Copernicus Publications on behalf of the European Geosciences Union
Year: 2006
DOI identifier: 10.5194/angeo-24-2227-2006
OAI identifier: oai:lra.le.ac.uk:2381/7877

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  1. (2006). 2242 H. Hu et al.: Dayside flow bursts and high-latitude reconnection doi
  2. (1989). A new magnetic coordinate system for conjugate studies at high latitudes, doi
  3. (1990). A study of the relationship between interplanetary parameters and large displacements of the nightside polar cap boundary, doi
  4. (1997). A.: An empirical model of the substorm current wedge, doi
  5. (1987). A.: Drift motions of small-scale irregularities in the high-latitude F region: an experimental comparison with plasma drift motions, doi
  6. (2002). A.: Ground-based observations of the auroral zone and polar cap ionospheric responses to dayside transient reconnection, doi
  7. (1984). AFGL-TR-84-0317, Air Force Geophys. Lab., Hanscom Air Force Base,
  8. (1983). Comparison of S3-2 polar cap potential drops with the interplanetary magnetic field and models of magnetopause reconnection, doi
  9. (2003). Continuous magnetic reconnection at Earth’s magnetopause, doi
  10. (2000). 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
  11. (2004). Cusp and LLBL as sources of the isolated dayside auroral feature during northward IMF, doi
  12. (1998). CUTLASS Finland radar observations of the ionospheric signatures of flux transfer events and the resulting plasma flows, doi
  13. (2001). Dayside auroral bifurcation sequence during By -dominated interplanetary magnetic field: Relationship with merging and lobe convection cells, doi
  14. (1998). Dayside auroral configurations: Response to southward and northward rotations of the interplanetary magnetic field, doi
  15. (2000). Dynamic cusp aurora and associated pulsed reverse convection during northward interplanetary magnetic field, doi
  16. (1995). Events of enhanced convection and related dayside auroral activity, 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. (1997). High-latitude particle precipitation and its relationship to magnetospheric source regions, doi
  20. (1996). Identification of the poleward boundary of the auroral oval using characteristics of ion precipitation, doi
  21. (1985). IMF By -dependent plasma flow and Birkland currents in the dayside magnetosphere, 2. A global model for northward and southward IMF, doi
  22. (1984). Initial EISCAT observations of plasma convection at invariant latitudes of 70– 77◦, doi
  23. (1978). Initial ISEE magnetometer results: Magnetopause observations, doi
  24. (1993). Interpretation of HF radar ionospheric Doppler spectra by collective wave scattering theory,
  25. (1983). Interpretation of observed relations between solar wind characteristics and effects at ionospheric altitudes, in: High-Latitude Plasma Physics, doi
  26. (1998). Large-scale imaging of highlatitude convection with Super Dual Auroral Radar Network HF radar observations, doi
  27. (1995). Low-altitude observations and modeling of quasi-steady magnetopause reconnection, doi
  28. (2001). Magnetosheath plasma precipitation in the polar cusp and its control by the interplanetary magnetic field, doi
  29. (1976). Magnetosphere convection induced by the positive and negative Z components of the interplanetary magnetic field: quantitative analysis using polar cap magnetic records, doi
  30. (1981). Magnetospheric and ionospheric flow and the interplanetary magnetic field, in:
  31. (1992). Mapping of the dayside ionosphere to the magnetopause according to particle precipitation events, doi
  32. (2004). Measuring the dayside reconnection rate during an interval of due northward interplanetary magnetic field, doi
  33. (1999). Meridian- scanning photometer, coherent HF radar and magnetometer observations of the cusp: a case study, doi
  34. (2005). Modulation of dayside reconnection during northward IMF,
  35. (2003). Multi-site observations of the association between aurora and plasma convection in the cusp/polar cap during a southeastward (By≈|Bz|) IMF orientation, doi
  36. (1997). Northward interplanetary magnetic field cusp aurora and high-latitude magnetopause reconnection, doi
  37. (1985). Observations of a possible signature of flux transfer events, doi
  38. (2000). Plasma structure within poleward-moving cusp/cleft auroral transients: EISCAT Svalbard radar observations and an explanation in terms of large local time extent of events, doi
  39. (1972). Polar cap electric field distributions related to the interplanetary magnetic field direction, doi
  40. (1985). Polar cap inflation and deflation, doi
  41. (2002). Proton aurora in the cusp,
  42. (2006). Reconfiguration and closure of lobe flux by reconnection during northward IMF: possible evidence for signatures in cusp/cleft auroral emissions, doi
  43. (2001). Reconnection at the high-latitude magnetopause during northward interplanetary magnetic field conditions, doi
  44. (1992). Reverse convection, doi
  45. (1997). Simultaneous observations of the cusp in optical, doi
  46. (1998). Solar Wind Electron Proton Alpha Monitor (SWEPAM) for the Advanced Composition Explorer, Space Sci. doi
  47. (2000). Stability of the high-latitude reconnection site for steady northward IMF, doi
  48. (1996). Statistical patterns of high-latitude convection obtained from Goose Bay HF radar observations, doi
  49. (2004). Stereo CUTLASS – A new capability for the SuperDARN HF radars, doi
  50. (1998). Super Dual Auroral Radar Network observations of convection during a period of small-magnitude northward doi
  51. (1995). SuperDARN: a global view of the dynamics of highlatitude convection, doi
  52. (2002). The dayside reconnection X line, doi
  53. (2003). The dependence of cusp ion signatures on the reconnection rate, doi
  54. (2004). The dynamics and relationships of precipitation, temperature and convection boundaries in the dayside auroral ionosphere, doi
  55. (1978). The frontside boundary layer of the magnetopause and the problem of reconnection, doi
  56. (1963). The structure of the exosphere, or, adventures in velocity space, Geophysics, in: The Earth’s Environment, edited by:

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