Hourly Mesosphere Wind Estimates (Meteor Winds) from GLOBMET and MAP for Stations in Europe and AsiaEntry ID: MAPDAMW021
Abstract: This data set contains hourly wind estimates for both the meridional and zonal
components, accompanied by sample standard deviations and meteor hourly rates.
The data are recorded at Obninsk, Volgograd, Kazan, Kharkov, Irkutsk, Dushanbe,
and Frunze in the USSR. The hourly winds were obtained at the height interval
of 92-95 km except at Irkutsk (110 km). The measurements are provided using
... ground-based meteor radars at all sites except Irkutsk. The Irkutsk station
used the D1 method of drift measurements, i.e. intercomparison of fading
signals, reflected by the E-layer of the ionosphere, at three or more antennas
spaced a few wavelengths apart. Measurements are carried out under the
MAP/GLOBMET program. Data set structure corresponds to the 'Guide to the
International Data Exchange through the World Data Center's (Meteors)'.
Data covers main the GLOBMET observational periods, i.e two months at each
station around Spring Equinox and one month near Summer Solstice.
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 ).
The GLOBMET (Global Meteor Observation System) Project (1982-1990) was one of
the MAP projects aimed at intensifying research in Meteor Geophysics and Meteor
Astronomy in the 1980's by making wider use of the latest achievements in this
field and expanding international coordination in meteor research. The main
objective of the project was to organize a network of meteor observatories,
which will provide experimental data : (1) for testing of models of atmospheric
circulation which include the meteor region; (2) on the influx of meteors and
the distribution of meteoroids in the neighborhood of the Earth; and (3) for
testing models of meteoroid/atmosphere interaction.
The MAP (Middle Atmosphere Program) was an international cooperative enterprise
scheduled for 1982-1985 and then continued as the Middle Atmosphere Cooperation
(MAC) for 1986-1988. Its chief objective was to obtain a comprehensive
understanding of the structure, chemistry, energetics, and dynamics of the
middle atmosphere. For the purposes of the MAP, the middle atmosphere was
defined to be the atmosphere from the tropopause to the lower thermosphere,
that is, the region from about 10 to 100 km in altitude. The factors enumerated
above all interact with each other in such complicated ways that the study of
each of them in isolation leads to unreliable or even anomalous results. This
can be remedied by a more integrated and unified attack - specifically by the
coordination, in time and location, of observations of the various factors, and
by cooperation in the interpretation of the results. This was the rationale for
MAP. The operational basis for MAP was an international plan for coordinated
observations from spacecraft, ground-based facilities, aircraft, balloons and
rockets. The MAP also encouraged cooperative data management, information
exchange on all appropriate time scales, and interaction between
observationalists, modelers, and theoreticians.
Start Date: 1980-01-01Stop Date: 1985-02-16
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
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Creation and Review Dates
Last DIF Revision Date: 2016-01-27