Global S&T Development Trend Analysis Platform of Resources and Environment
项目编号 | 1451218 |
Collaborative Research: Experimental Investigation of Micrometeoroid Ablation | |
Zoltan Sternovsky | |
主持机构 | University of Colorado at Boulder |
项目开始年 | 2015 |
2015-09-15 | |
项目结束日期 | 2018-08-31 |
资助机构 | US-NSF |
项目类别 | Standard Grant |
项目经费 | 30000(USD) |
国家 | 美国 |
语种 | 英语 |
英文摘要 | In this project, a laboratory a study aimed at measuring the evaporation rate and ionization efficiency of particles representing interplanetary dust particles will be combined with models to interpret radar measurements of meteor head echoes in the Earth's atmosphere, which are generated by ablation. Much of the laboratory work, which utilizes a dust accelerator facility at the U. of Colorado, is being funded by NASA. The NSF project will focus on interpreting meteor radar measurements performed at sites including Poker Flat, AK, Arecibo, PR, Jicamarca, Peru, and radars in Argentina, Japan and Norway. NSF will support the coordination between the laboratory results, modeling, and radar data interpretation, as well as undergraduate student participation in the laboratory measurements. Layers of neutral metal atoms, such as Fe, Mg, Ca, K and Na, which peak between 85 and 95 km and are ~20 km in width, are produced by the daily ablation of Interplanetary Dust Particles. Once the meteoric metals are injected into the Earth's upper atmosphere they are responsible for a range of phenomena in addition to the formation of layers of metal atoms and ions, such as nucleation of noctilucent clouds; impacts on stratospheric aerosols and ozone chemistry; and fertilization of the ocean with bio-available iron. Current estimates for the total mass of the micrometeoroid input that is ablated in the upper atmosphere vary by two orders of magnitude. The accurate determination of the total incoming mass is relevant to determining vertical transport in the middle atmosphere and to the surface, and our understanding of dust evolution in the solar system. Radar detection of micrometeors is a widely used technique to constrain the mass input. The laboratory work undertaken by the U. of Colorado will provide much improved measurements of the key parameter needed to interpret these measurements: the ionization efficiency during the ablation process upon atmospheric entry. |
来源学科分类 | Geosciences - Atmospheric and Geospace Sciences |
文献类型 | 项目 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/68774 |
专题 | 环境与发展全球科技态势 |
推荐引用方式 GB/T 7714 | Zoltan Sternovsky.Collaborative Research: Experimental Investigation of Micrometeoroid Ablation.2015. |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Zoltan Sternovsky]的文章 |
百度学术 |
百度学术中相似的文章 |
[Zoltan Sternovsky]的文章 |
必应学术 |
必应学术中相似的文章 |
[Zoltan Sternovsky]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论