Accession Number:

ADA043305

Title:

Periodic Wind Variations at 65-118 km at Saskatoon (52N).

Descriptive Note:

Final rept. Apr 76-Apr 77,

Corporate Author:

CONTROL DATA CORP MINNEAPOLIS MINN RESEARCH DIV

Report Date:

1977-05-26

Pagination or Media Count:

39.0

Abstract:

Periodic time analyses of radio reflection winds from 65-118 km at Saskatoon 52 deg N, 1969-1976, confirm component waves amplitudes and phases previously found by meteor-wind radar data at highest altitudes. These analyses also provide values down to meteorological rocket altitudes. The newest information is that the semiannual wave progresses downward at a very constant rate of 8 kmmonth from 118 to 70 km. The semiannual phase dates suggest that this wave may be caused by either or both 1 the influence of auroral particle precipitation maxima on heating by eventual effects on ozone, or 2 the influence of heating at high latitudes during sudden warmings. A three-month wave, also found, has twice the rate of phase progression as the semiannual wave. Significant spectral peaks are found near a period of 5 days, particularly in summer. At least half of the variance of data spaced at five-minute intervals is associated with variations of period less than about one-half hour, suggesting that sampling should be performed at the highest possible frequency.

Subject Categories:

  • Atmospheric Physics
  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE