HWM是一个水平上热层中性风的经验模型。它是基于AE-E和DE 2卫星数据获得的。矢量球谐是用来描述一组有限的经向和纬向风分量。第一个版本发布于1987年（HWM87）的模型被用于超过220公里的大风。风的数据列入非相干散射雷达和陆基法布里 - 珀罗光学干涉仪，HWM90向下延伸到100公里，并使用MF/流星数据HWM93延伸到地面。HWM90受太阳活动周期的变化较小，而且并不总是很清楚地划定是当前的数据。该模型描述了从上热层为主的昼夜变化半日变化，低热和过渡从夏季到冬季，冬季到夏季流量低于流量140公里以上的过渡。在一些地方海拔在风中向上延伸至300公里。该模型软件提供指定的纬度，经度，时间，和Ap指数的经向和纬向风。-Brief Descr iption:

The HWM is an empirical model of the horizontal neutral wind in the upper thermosphere. It is based on wind data obtained from the AE-E and DE 2 satellites. A limited set of vector spherical harmonics is used to describe the zonal and meridional wind components. The first edition of the model released in 1987 (HWM87) was intended for winds above 220 km. With the inclusion of wind data from ground-based incoherent scatter radar and Fabry-Perot optical interferometers, HWM90 was extended down to 100 km and using MF/Meteor data HWM93 was extended down to the ground. Solar cycle variations are included (since HWM90), but they are found to be small and not always very clearly delineated be the current data. Variations with magnetic activity (Ap) are included. Mid- and low-latitude data are reproduced quite well by the model. The polar vortices are present, but not to full detail. The model describes the transition from predominately diurnal variations in the upper therm