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| Detailed Reference Information |
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Ohtani, S., Newell, P.T. and Takahashi, K. (2000). Dawn-dusk profile of field-aligned currents on May 11, 1999: A Familiar pattern driven by an unusual cause. Geophysical Research Letters 27: doi: 10.1029/2000GL003789. issn: 0094-8276. |
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On May 11, 1999, when the solar wind almost disappeared, the DMSP-F13 satellite observed two field-aligned current (FAC) sheets on both dawn and dusk sides. The dawnside FACs are identified as conventional region 1 (R1) and region 2 (R2) currents. The duskside FACs are collocated with intense polar-rain precipitation and are identified as midday region 1 and region 0 currents. Whereas the positive IMF BY observed explains the duskward shift/extension of those midday current systems, the extent of the distortion was unusual. It is inferred that the magnetospheric configuration was more axisymmetrical because of extremely low solar-wind dynamic pressure, and therefore the reconnection took place farther away from the midday sector. Conventional R1 and R2 currents as well as boundary layer-type precipitation were nearly absent at dusk, suggesting that the viscous interaction did not operate at least observably on the dusk side in the present event. ¿ 2000 American Geophysical Union |
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Abstract |
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Keywords
Magnetospheric Physics, Energetic particles, precipitating, Magnetospheric Physics, Magnetospheric configuration and dynamics, Magnetospheric Physics, Solar wind/magnetosphere interactions |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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