Quantifying energetic particle precipitation into the atmosphere

量化进入大气中的高能粒子沉淀

• 批准号: NE/J008125/1
• 负责人: Mark Clilverd
• 金额: $ 23.83万
• 依托单位: British Antarctic Survey
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2013
• 资助国家: 英国
• 起止时间: 2013 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FJ008125%2F1
• 关键词: Quantifying; energetic; particle; precipitation; into

This proposal will combine the expertise and data sets provided by Lancaster University and the British Antarctic Survey to answer a series of important questions regarding the significance of charged particle precipitation into the atmosphere on atmospheric chemistry. This will advance the debate on how solar activity affects tropospheric and stratospheric variability by establishing a key link in the chain. Two inter-hemispheric, ground-based networks of instruments will be used to provide estimates of energetic electron precipitation. Lancaster is the PI institute for the Global Riometer Array (GLORIA) and BAS is the co-PI institute of the Antarctic-Arctic Radiation-belt Dynamic Deposition VLF Atmospheric Research Konsortia (AARDDVARK). This project aims to provide a global picture of the fluxes of energetic electrons entering the atmosphere in order to answer the key question: what is the significance of energetic electron precipitation to atmospheric chemistry and dynamics? The primary aim of this proposal will be to utilise the riometer (relative ionospheric opacity meter) and VLF (very low frequency) radio wave observations together with advanced modelling of the electron distributions in the magnetosphere, in order to determine the characteristics of energetic electron precipitation in the atmosphere and the polar regions in particular. These instruments respond to different electron energies and by combining the observations with suitable modelling of the electrons in the magnetosphere it is possible to make estimates of the location, energy spectrum and flux of electron precipitation events, particularly in the polar regions, and at energies that have implications for atmospheric chemistry in the stratosphere and mesosphere. The data product will be of particular use for coupled-climate models as an input to represent the coupling between geomagnetic activity and the atmosphere, instead of broad geomagnetic indexes such as Ap or Kp. Although the key aim is to produce electron flux spectra, this can be easily converted into ion-pair production rates or even NOx profiles to suit the model input requirements. This data product will be employed in an ion and neutral chemistry model to determine the corresponding level of NOx production. We will use this to answer the following key questions: 1. How does the NOx profile vary during substorms and storms? 2. How does NOx production vary between hemispheres? We will determine the role of solar wind driving of atmospheric chemistry rather than solar irradiance. The inter-hemispheric nature of GLORIA and AARDDVARK means that we will be able to determine NOx production in both polar regions simultaneously and determine differences and similarities from season to season. These are important questions concerning the importance of atmospheric chemistry in the upper atmosphere and how it is influenced by geomagnetic activity. We will therefore be able to answer what is the significance of energetic electron precipitation to atmospheric chemistry and dynamics?

这项建议将结合兰开斯特大学和英国南极调查局提供的专业知识和数据集，回答有关进入大气层的带电粒子降水对大气化学的重要性的一系列重要问题。这将通过建立链中的关键环节来推进关于太阳活动如何影响对流层和平流层可变性的辩论。将使用两个半球间的地面仪器网络来估计高能电子沉淀。兰开斯特是全球Rieter阵列(GLORIA)的PI研究所，BAS是南极-北极辐射带动态沉积甚低频大气研究Konsortia(AARDDVARK)的联合PI研究所。该项目旨在提供进入大气层的高能电子通量的全球图像，以回答关键问题：高能电子沉淀对大气化学和动力学的意义是什么？这项提议的主要目的将是利用RIMETER(相对电离层不透明度计)和VLF(甚低频)无线电波观测，以及对磁层中电子分布的高级模拟，以便确定大气层、特别是极地地区高能电子沉淀的特征。这些仪器对不同的电子能量作出反应，通过将观测结果与磁层电子的适当模拟结合起来，就有可能估计电子沉淀事件的位置、能谱和通量，特别是在极地地区，以及对平流层和中间层的大气化学有影响的能量。该数据产品将特别用于耦合气候模式，作为反映地磁活动和大气之间的耦合的输入，而不是广泛的地磁指数，如AP或Kp。虽然其主要目的是产生电子通量谱，但这可以很容易地转换成离子对的产生率，甚至NOx分布，以适应模型的输入要求。该数据产品将用于离子和中性化学模型，以确定相应的NOx生成水平。我们将利用这一点来回答以下关键问题：1.亚暴和风暴期间NOx的分布是如何变化的？2.NOx的生成量在半球之间是如何变化的？我们将确定太阳风驱动大气化学而不是太阳辐射的作用。Gloria和AARDDVARK的半球间性质意味着我们将能够同时确定两极地区的NOx生成，并确定不同季节的差异和相似之处。这些都是关于高层大气中大气化学的重要性以及地磁活动如何影响大气化学的重要问题。因此，我们将能够回答高能电子沉淀对大气化学和动力学的意义是什么？

项目成果

Ground‐Based Observations of VLF Waves as a Proxy for Satellite Observations: Development of Models Including the Influence of Solar Illumination and Geomagnetic Disturbance Levels

甚低频波的地面观测作为卫星观测的代理：开发包括太阳光照和地磁扰动水平影响的模型

• DOI: 10.1029/2018ja026407
• 发表时间: 2019
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: Simms, Laura E.;Engebretson, Mark J.;Clilverd, Mark A.;Rodger, Craig J.
• 通讯作者: Rodger, Craig J.

Electron precipitation from EMIC waves: A case study from 31 May 2013

• DOI: 10.1002/2015ja021090
• 发表时间: 2015-05
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: M. Clilverd;R. Duthie;Rachael L. Hardman;A. Hendry;C. Rodger;T. Raita;M. Engebretson;M. Lessard;D. Danskin;D. Milling

Comparison between POES energetic electron precipitation observations and riometer absorptions: Implications for determining true precipitation fluxes

POES 高能电子降水观测与测力计吸收之间的比较：对确定真实降水通量的影响

• DOI: 10.1002/2013ja019439
• 发表时间: 2013
• 期刊: Space Physics
• 作者: Rodger C

An Updated Model Providing Long-Term Data Sets of Energetic Electron Precipitation, Including Zonal Dependence

提供高能电子沉淀长期数据集（包括区域依赖性）的更新模型

• DOI: 10.1029/2017jd028253
• 发表时间: 2018
• 期刊: Atmospheres
• 作者: Van De Kamp M

A model providing long-term data sets of energetic electron precipitation during geomagnetic storms

提供地磁风暴期间高能电子沉淀长期数据集的模型

• DOI: 10.1002/2015jd024212
• 发表时间: 2016
• 期刊: Atmospheres
• 作者: Van De Kamp M