Advanced Meteor Head Echo observation with MAARSY for the quantification of the micro meteoroid flux into the MLT

使用 MAARSY 进行高级流星头回波观测，以量化进入 MLT 的微流星体通量

• 批准号: 245530791
• 负责人: Privatdozent Dr. Gunter Stober
• 金额: --
• 依托单位: Institut für angewandte Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/245530791?language=en
• 关键词: Advanced; Meteor; Head; Echo; observation

There is a continuous stream of extraterrestrial particles on the Earth reaching from tiny dust grains up to the size of asteroids. Most of the meteoroids entering the Earth's atmosphere burn up and deposit their mass in the altitude range between 70-140 km. The ablated meteoric constituents are considered to play an important role in the formation of mesospheric ice particles. These ice particles lead to the known phenomena of noctilucent clouds and polar mesospheric summer echoes. Both phenomena are important tracers of atmospheric dynamics and are useful to infer climate trends at these heights. To enhance our understanding of these climate signals it is essential to quantify the meteoric mass deposit into the mesosphere/lower thermosphere (MLT). Until today there is no robust estimate of the total mass flux into this height region. The estimates of the meteoric mass flux range from 5-270 t/d in the literature.The objective of this proposal is a significant reduction of this uncertainty. We propose to make use of the continuous atmospheric operation of the Middle Atmosphere Alomar Radar system (MAARSY) on the Norwegian island Andoya to measure meteor-head echoes at the same time that the radar is measuring other phenomena, e.g., mesospheric summer and winter echoes. This new and unique data set will help us to derive a meteor-head echo climatology. In particular, the interferometric capabilities of the new radar combined with the multi-channel recorder system permits to determine the meteoroid velocity, trajectory and source radiant with high precision. Based on these measurements we plan to investigate the seasonal pattern for the different sporadic meteor sources and to infer the meteor flux for the observed particle sizes (10e-6-10e-11 kg). Further we propose to investigate the ionization efficiency for the different meteor populations, e.g. meteor showers and sporadics, by comparing the scattering mass with the dynamic mass of the observed meteoroids.These observations will help to constrain the total meteoric mass input into the MLT at the particle size range, which is hardly accessible by any other continuous remote sensing technique. The deduced seasonal pattern of the meteor fluxes are essential to model the mesospheric ice formation and to enhance our understanding of the climatological trends derived from the noctilucent clouds and their corresponding radar echoes.

地球上有一股持续不断的外星粒子流，从微小的尘埃颗粒到小行星的大小。大多数进入地球大气层的流星体在70-140公里的高度范围内燃烧并存款其质量。大气中的大气成分被认为在中间层冰粒的形成过程中起着重要的作用。这些冰粒导致了已知的平流层云和极地中层夏季回波现象。这两种现象都是大气动力学的重要示踪物，有助于推断这些高度的气候趋势。为了加强我们对这些气候信号的理解，有必要对进入中间层/低热层（MLT）的流星质量存款进行量化。直到今天，还没有可靠的估计进入这个高度区域的总质量通量。文献中对流星质量通量的估计范围为5-270 t/d，本建议的目的是大大减少这种不确定性。我们建议利用挪威安多亚岛上的中层大气Alomar雷达系统（MAARSY）的连续大气操作来测量流星头回波，同时雷达正在测量其他现象，例如，中间层夏季和冬季的回声。这个新的和独特的数据集将帮助我们推导出一个流星头回波气候学。特别是，新雷达的干涉测量能力与多通道记录器系统相结合，可以高精度地确定流星体的速度、轨迹和辐射源。根据这些测量结果，我们计划调查不同的零星流星源的季节性模式，并推断观测到的颗粒大小（10 e-6- 10 e-11公斤）的流星通量。此外，我们建议调查电离效率为不同的流星群体，如流星雨和零星的，通过比较散射质量与动态质量的观测流星体，这些观测将有助于限制总流星质量输入到MLT的颗粒大小范围内，这是很难获得的任何其他连续遥感技术。推断的流星通量的季节性模式是必不可少的模拟中间层冰的形成，并提高我们的理解的气候趋势，来自的南极云及其相应的雷达回波。

项目成果

A novel ZePoC encoder for sinusoidal signals with a predictable accuracy for an AC power standard

一种新颖的 ZePoC 正弦信号编码器，具有符合交流电源标准的可预测精度

• DOI: 10.5194/ars-13-1-2015
• 发表时间: 2015
• 期刊: Advances in Radio Science
• 影响因子: 0.4
• 作者: T. Renkwitz;C. Schult;R. Latteck;G. Stober
• 通讯作者: G. Stober

Radar observations of the Maribo fireball over Juliusruh: revised trajectory and meteoroid mass estimation

Juliusruh 上空马里博火球的雷达观测：修正的轨迹和流星体质量估计

• DOI: 10.1093/mnras/stv614
• 发表时间: 2015
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: C. Schult;G. Stober;D. Keuer;W. Singer
• 通讯作者: W. Singer

Nonspecular meteor trails from non‐field‐aligned irregularities: Can they be explained by presence of charged meteor dust?

• DOI: 10.1002/2014gl059922
• 发表时间: 2014-05
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Jorge L. Chau;I. Strelnikova;C. Schult;M. Oppenheim;Michael C. Kelley;G. Stober;Werner Singer