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
Personal Author(s):
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.
Descriptors:
- *MESOSPHERE
- *WIND
- DATA PROCESSING
- THERMOSPHERE
- ATMOSPHERIC MOTION
- REFLECTION
- METEOROLOGICAL DATA
- LONG RANGE(TIME)
- SHORT RANGE(TIME)
- SEASONAL VARIATIONS
- WIND VELOCITY
- AURORAE
- OSCILLATION
- RADIO WAVES
- SPECTRUM ANALYSIS
- DIURNAL VARIATIONS
- PERIODIC VARIATIONS
- PHASE SHIFT
- JET STREAMS
- ATMOSPHERIC SOUNDING
- HARMONIC ANALYSIS
- ROSSBY WAVES
- SASKATCHEWAN
Subject Categories:
- Atmospheric Physics
- Meteorology