Physics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..105z&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 1, p. 105-117.
Physics
6
Neutral Wind, Lower Thermosphere, Atmospheric Tide
Scientific paper
Neutral winds in the lower thermosphere (95-130km) measured during the March equinox period (1991-1992) by ground-based incoherent scatter radars at Arecibo (18°N), Millstone Hill (42.5°N), and Sondrestrom (67°N) and by the space-based wind imaging interferometer (WINDII) are compared and show overall good agreement but some differences. At 18°N, the wind field in the altitude region of 95-110km displays prevailing upward propagating diurnal tides with wavelengths of about 22km. The diurnal structure is affected by the semidiurnal tide resulting in regular minima separated by 11-12h. At altitudes above 110km, the diurnal tide dominant wind structure changes to the semidiurnal tide dominant structure as illustrated clearly by WINDII data with 24h coverage. Winds at 42.5°N and 67°N show similar structures in which winds at 105-115km are generally anti-sunward. Daytime ISR winds show prevailing upward propagating semidiurnal tides with wavelengths of 35-70km. Winds from WINDII reveal the existence of the in situ thermospheric diurnal tide with amplitudes comparable to those of the semidiurnal tide. The superimposition of the two tides result in a wind field stronger during daytime than during nighttime at mid- and high-latitudes. Geomagnetic influence on neutral winds is negligible at low- and mid-latitudes under solar quiet conditions, but is observed at high-latitudes, where wind vectors follow a clockwise one-cell pattern at altitudes above about 118km in geomagnetic coordinates. Most recent simulations for the three latitudes provided by the NCAR thermosphere/ionosphere/mesosphere electrodynamics general circulation model are compared to the observations. The results at low- and mid-latitudes agree well with the observed winds in both wind structures and magnitudes, and reveal details of wave transition. Simulations for high-latitudes are less satisfactory, and require further improvements.
Goncharenko Larisa P.
Roble Raymond G.
Salah Joseph E.
Shepherd Gordon G.
Thayer Jeffrey P.
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