Climatology of Meteor Winds over Atlanta (38 N, 84 W); August 1974 - April 1987

亚特兰大流星风气候学（北纬 38 度，西经 84 度）；

• 批准号: 8811935
• 负责人: Robert Roper
• 金额: $ 6万
• 依托单位: Georgia Tech Research Corporation - GA Tech Research Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1990-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8811935&HistoricalAwards=false
• 关键词: Climatology; Meteor; Winds; over; Atlanta

Radars provide a useful means of determining winds in the upper atmosphere by means of the shift in frequency of the returned signal (the doppler shift) that is proportional to the wind speed and defined in altitude by the range measurement of the radar. At nighttime the ionosphere largely recombines below 100km and there is an absence of scatterers in the 50 to 100 km region, except for the ionized tails of meteors. (Meteors are the visual manifestation of the penetration into the atmosphere of tiny fragments of interplanetary material, mostly the size of a grain of sand or smaller, with occasionally a larger one, that mostly burn up on entry). The meteor radar data reveal the presence of tides, planetary waves, seasonal and solar cycle variations in winds. This award is for analysis of a 13 year set to be prepared for the CEDAR data base and made available to the Aeronomy community generally, and used in the generation of models of middle atmosphere winds.

雷达提供了一种有用的手段，通过返回信号的频率漂移(多普勒频移)来确定高层大气中的风，该频移与风速成正比，并由雷达的距离测量定义为高度。在夜间，电离层在100公里以下基本重组，除了流星的电离尾巴外，50到100公里范围内没有散射体。(流星是星际物质的微小碎片侵入大气层的视觉表现，这些碎片大多有一粒沙子大小或更小，偶尔也会有更大的沙粒，它们在进入大气层时大多会燃烧)。流星雷达数据揭示了潮汐、行星波、季节和太阳周期风向的变化。这一奖项是对为雪松数据库准备的13年的分析，并提供给一般的空气工程学团体，并用于生成中大气风模型。