| 项目编号: | 1640955
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| 项目名称: | Collaborative Research: The Impact of Lower Atmosphere Waves on Ionospheric Irregularities |
| 作者: | John Retterer
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| 承担单位: | Boston College
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| 批准年: | 2017
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| 开始日期: | 2017-01-15
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| 结束日期: | 2017-12-31
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| 资助金额: | 60000
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Atmospheric and Geospace Sciences
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| 英文关键词: | ionospheric irregularity
; work
; irregularity
; whole atmosphere model formulation
; boston college plasma irregularity model
; whole atmosphere model
; cu whole atmosphere model
; ionospheric plasma density
; irregularity formation
; irregularity modeling
; ionospheric f-region irregularity
; atmosphere wave
; background neutral atmosphere
; ionospheric physicw
; thermosphere neutral atmosphere dynamical model
|
| 英文摘要: | The overarching goal of this award is to address one of the long-standing problems in ionospheric physicws by determining the role of the lower atmosphere waves in the day-to-day variability of the development of F-region ionospheric irregularities. The lateral distribution of ionospheric plasma density is normally fairly uniform except for the irregularities that are similar in appearance to air bubbles in a liquid. The steep gradients on the edges of the bubbles disrupt radio wave signals, and so pose a significant hazard to a number of critical applications. Aviation and shipping are increasingly reliant on satellite navigation and thus, the disruption of navigation radio signals by these ionospheric irregularities poses a threat to passengers and crew, as well as the crafts themselves. Understanding the day-to-day variability of ionospheric irregularities has been one of the long-standing challenges in space physics. The proposed work describes how a whole atmosphere model (WAM) that covers the altitude region from the ground to the top of the atmosphere together would be combined with an ionosphere plasma model that would be used to provide the background neutral winds and waves, plasma densities, and electrodynamic fields to drive a high-resolution ionospheric irregularity model. The goal is to determine what it is about the variability in the synoptic and large-scale background fields that is critical in explaining the variability of irregularity formation. A pilot study would be funded to carry out representative model calculations that would demonstrate the methodology of this unification of the thermosphere neutral atmosphere dynamical model with the Boston College plasma irregularity model. The broader impact of this study would be the potential development of a significant space weather forecasting capability based upon the tropospheric weather data imported into the whole atmosphere model formulation.
The primary objective of the proposed work is to determine the characteristics and conditions of the background neutral atmosphere that lead to the initiation and development of ionospheric F-region irregularities at low latitudes. The work proposed would be based upon a collaboration between the University of Colorado (CU) and Boston College (BC) that would combine the large-scale whole atmospheric-ionosphere-electrodynamic modeling expertise at CU (Fuller-Rowell, Fang) with the BC group (Retterer, Groves, Valladares) that would provide the expertise regarding the irregularity modeling combined with observations from the LISN South American network developed under the leadership of Valladares. The motivation for this study is based upon the results of an ionospheric irregularity model simulation driven by the wind and wave fields derived by the CU whole atmosphere model with all the inherent variability associated with tropospheric dynamics. This simulation showed that irregularities grew naturally from the initial physical state without the need for additional artificial seeding. The proposed work builds upon recent findings that have exposed a strong connection between terrestrial and space weather. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/90629
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
John Retterer. Collaborative Research: The Impact of Lower Atmosphere Waves on Ionospheric Irregularities. 2017-01-01.
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