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Summary

The HWM87 is an empirical model of the horizontal neutral wind in the
upper thermosphere analogous to the MSIS model for neutral temperature
and density. It is based on wind data obtained from the Atmosphere
Explorer E and Dynamics Explorer 2 satellites. A limited set of vector
spherical harmonics is used to describe the zonal and meridional wind
... components. The data base was not adequate to detect solar cycle
effects but the model does include magnetic activity effects. Mid- and
low- latitude data are reproduced quite well by the model. The polar
vortices are present, but not to full detail. Currently the model is
intended for winds above 220 km altitude; it does not include altitude
variations. The model software provides zonal and meridional winds
for specified latitude, longitude, time, and Ap-index. The model code
is distributed by NSSDC on magnetic tape, on diskettes for use on PCs,
and online on NSI/DECNET.

Geographic Coverage Spatial coordinates   

N: 90.0

S: -90.0

E: 180.0

W: -180.0

Data Set Citation

Dataset Creator: NASA/GSFC/NSSDC Dataset Title: HWM Neutral Wind Model from NSSDC Online Resource: http://nssdc.gsfc.nasa.gov

Location Keywords

GEOGRAPHIC REGION > GLOBAL VERTICAL LOCATION > THERMOSPHERE

Science Keywords

ATMOSPHERE > ATMOSPHERIC TEMPERATURE > AIR TEMPERATURE ATMOSPHERE > ATMOSPHERIC WINDS > UPPER LEVEL WINDS SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE PROPERTIES > PARTICLE DENSITY

ISO Topic Category

GEOSCIENTIFIC INFORMATION CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Ancillary Keywords

HWM87 IDN_NODE GSFC/NSSDC THERMOSPHERE WINDS

Originating Center

NSSDC

Data Center

National Space Science Data Center, Space Science Data Operation Office, Goddard Space Flight Center, NASA Data Center URL: http://nssdc.gsfc.nasa.gov/ Dataset ID: MN-62 Data Center Personnel Name: NSSDC USER SUPPORT OFFICE Phone: (301) 286-6695 Fax: (301) 286-1635 Email: request at nssdca.gsfc.nasa.gov Contact Address: National Space Science Data Center NSSDC/Code 633.4 NASA/Goddard Space Flight Center City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA

Personnel

DIETER BILITZA Role: DIF AUTHOR Phone: 301-286-0190 Fax: 301-286-1771 Email: Dieter.Bilitza-1 at nasa.gov Contact Address: NASA Goddard Space Flight Center Mailstop 672.0 City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA ALAN E. HEDIN Role: INVESTIGATOR

Publications/References

A.E. Hedin, N.W. Spencer, and T.L. Killeen, Empirical global model of
upper thermosphere winds based on Atmosphere and Dynamics Explorer
satellite data, J. Geophys. Res., 93, 9959-9978, 1988

Creation and Review Dates

Last DIF Revision Date: 2005-07-28

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