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AGU: Geophysical Research Letters

 

Index Terms

  • Magnetospheric Physics: Auroral phenomena
  • Magnetospheric Physics: Plasma convection
  • Magnetospheric Physics: Solar wind/magnetosphere interactions
  • Magnetospheric Physics: Ring current
  • Magnetospheric Physics: Magnetic storms and substorms

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L13107, 5 PP., 2006
doi:10.1029/2006GL026388

Dayside convection aligned auroral arcs

Y. Zhang

Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA

L. J. Paxton

Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA

TIMED GUVI and IMAGE FUV observed a new phenomenon: Dayside Convection Aligned Auroral Arcs (DCAA) under conditions of high solar wind speed/dynamic pressure, and magnetic activity. The DCAA is observed near the dayside ionospheric convection throat and aligned with the convection direction. All the data suggest that DCAA is due to energetic proton/ions and/or electrons from the dayside ring current. The life time of the DCAA under northward IMF conditions is much longer than that of the DCAA under southward IMF conditions. The length of DCAA ranges from 5° to 8° in magnetic latitude.

Received 22 March 2006; accepted 30 May 2006; published 14 July 2006.

Citation: Zhang, Y., and L. J. Paxton (2006), Dayside convection aligned auroral arcs, Geophys. Res. Lett., 33, L13107, doi:10.1029/2006GL026388.

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