Observation of vertical e-region neutral winds in two intense auroral arcs

Details Observation of vertical e-region neutral winds in two intense auroral arcs Observation of vertical e-region neutral winds in two intense auroral arcs

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33..869p&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Aug. 1985, p. 869-873. NSERC-supported research.

Physics

16

Auroral Arcs, E Region, Vertical Air Currents, Wind Measurement, Auroral Electrojets, Current Density, Fabry-Perot Spectrometers, Oxygen Spectra

Scientific paper

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 magnitude. The upward winds were associated with westward overhead currents, and with low altitude aurora (about 110 km) as determined by the auroral temperature, while a high altitude aurora (about 135 km) and eastward currents were asssociated 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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