Simultaneous measurements of large vertical winds in the upper and lower thermosphere

Details Simultaneous measurements of large vertical winds in the upper and lower thermosphere Simultaneous measurements of large vertical winds in the upper and lower thermosphere

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..631p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 6, p. 631-643

Physics

33

Arctic Regions, Atmospheric Temperature, Energy Transfer, Error Analysis, Magnetic Disturbances, Thermosphere, Vertical Air Currents, Wind Velocity, Alaska, Altitude, Atmospheric Models, Atmospheric Models, Auroras, Clouds (Meteorology), Emission Spectra, Fabry-Perot Spectrometers, Horizontal Distribution, Light Scattering, Oxygen Atoms, Photometers

Scientific paper

High resolution vertical wind measurements of the upper and lower thermosphere were made at Poker Flat, Alaska, using a scanning Fabry-Perot spectrometer (FPS). Observations of the lambda 558 and lambda 630 nm emission of atomic oxygen were made on 21 nights and allowed for the simulataneous determination of wind and temperature at altitudes of about 130 and 240 km, respectively. On two occasions, significant upwelling events were measured which lasted between 15 and 25 min. Peak velocities were up to 42 m/s at 130 km and 138 m/s at 240 km. Auroral activity was monitored using a meridian scanning photometer (MSP). On both occasions, the region of upwelling was located on the poleward side of the auroral oval during geomagnetically active conditions. A schematic model is used to describe an event from which the horizontal scale of the upwelling region is estimated to be less than 320 km in the lower thermosphere and less than 800 km in the upper thermosphere.

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