Daily Mesosphere Wind Estimates (Meteor Winds) by Fourier Analysis for Stations in Antarctica, Arctic Ocean, and EuropeEntry ID: STP-MW-FA011
Abstract: This data set consists of meridional and zonal daily winds accompanied with
hourly meteor rates, as measured by ground-based meteor radar. The hourly winds
were obtained at the height interval of 92-95 km using meteor radars with no
angle gauges. The data were recorded at Molodezhnaya (Antarctica), Heiss Island
(Arctic Ocean), Obninsk, USSR, and Khulungsborn, Germany. Radar characteristics
include ... wave length = 9m, peak power = 50-70 kw, pulse length = 20-30 mks,
pulse repetition = 500 pps, sensitivity = 2-3 mkv, 5-elements yagi antennae,
and beam width = 35 degrees. The data coverage for the 4 stations spans 5
The term 'meteor wind' is used for the mesosphere wind estimates derived from
meteor trail drifts measurements. Ionized meteor trails are produced by
meteoroids (meteor particles) which enter the Earth's atmosphere. A meteor
trail moves in the atmosphere due to the neutral wind and magnetic field.
The radial component of this movement is measured using meteor radar. Estimates
of 'meteor wind' are derived for each direction (North, South, East, West) from
the set of measurements of radial components using statistical characteristics
of meteor parameter distributions and parameters of antenna pattern. The
'hourly meteor rate' which is the number of registered meteors for which
reliable estimates of radial components can be obtained can also be determined.
Meteoroids occur in the height interval 80-100 km and are centered at 92-95 km
(maximum for the apex time, near 6 a.m. LT, and minimum for anti-apex time,
near 6 p.m. LT ).
A set of hourly 'meteor wind' estimates for each day is processed using a
conventional Fourier procedure which produces estimates of a constant term
associated with the prevailing wind, and four harmonics (variances), associated
with diurnal, semidiurnal, 8-hour and 6-hour components of wind. Each component
(being a random value) is accompanied with an estimate of sample standard
deviation. The derived prevailing wind is not climatological as it varies from
day to day.
Start Date: 1970-01-29Stop Date: 1974-12-25
ISO Topic Category
Role: DIF AUTHOR
Email: Scott.A.Ritz at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: Maryland
Postal Code: 20771
Lysenko, I.A., Winds at the 80-100 km Heights. Obninsk (Russian),
Issue 1 - 1971, Issues 2,3,4 - 1972, Issues 5,6 - 1973, Issue 7 - 1974,
Issues 8,9 - 1976, Issue 10 - 1979.
Creation and Review Dates
Last DIF Revision Date: 1994-06-27