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Detailed Reference Information |
Collin, H.L., Peterson, W.K., Lennartsson, O.W. and Drake, J.F. (1998). The seasonal variation of auroral ion beams. Geophysical Research Letters 25: doi: 10.1029/1998GL900090. issn: 0094-8276. |
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We present observations of a seasonal variation in the occurrence frequency of upflowing ions beams near 1 RE altitude in the 1800--2400 local time sector. These observations were obtained from the Toroidal Imaging Mass-Angle Spectrograph (TIMAS) instrument during POLAR satellite perigee passes from March 1996 to September 1997. We show that the observed variation is most simply interpreted as a variation in the magnitude of the auroral acceleration process responsible for creating upflowing ion beams and precipitating energetic electrons. These observations, the first to find a seasonal effect in the occurence of ion beams, also confirm previous reports which examined related phenomena and provide further evidence that changes in ionospheric conductivity have a measurable effect in the strength of the interaction between the Earth's magnetosphere and ionosphere. ¿ 1998 American Geophysical Union |
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Abstract |
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Keywords
Ionosphere, Particle acceleration, Ionosphere, Ionosphere/magnetosphere interactions, Ionosphere, Ionospheric dynamics, Magnetospheric Physics, Auroral phenomena |
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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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