Observation of vertical E-region neutral winds in two intense auroral arcs |
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| Authors: | S Peteherych GG Shepherd JK Walker |
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| Institution: | Centre for Research in Experimental Space Science York University, Toronto, Canada M3J 1P3;Earth Physics Branch; Energy, Mines and Resources Ottawa, Ontario, Canada |
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| Abstract: | Vertical winds have been observed by optical Doppler measurements of the 557.7 nm emission in the aurora, using a Fabry-Perot spectrometer. Both upward and downward winds were observed, of 15 m s?1 magnitude. The upward winds were associated with westward overhead currents, and with low altitude aurora (～ 110 km) as determined by the auroral temperature, while a high altitude aurora (～ 135 km) and eastward currents were associated with the downward wind. The Lorentz force of these currents has the wrong direction to act as a direct forcing mechanism. It is concluded that Joule heating is directly responsible for the upward winds, while the divergence of horizontal winds is responsible for the downward winds. |
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