A statistical approach to determining energetic outer radiation belt electron precipitation fluxes
A statistical approach to determining energetic outer radiation belt electron precipitation fluxes
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确定高能外辐射带电子沉淀通量的统计方法
DOI：
10.1002/2013ja019715
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Juan V. Rodriguez
中科院分区：
文献类型：
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作者：
Mea Simon Wedlund;M. Clilverd;C. Rodger;K. Cresswell‐Moorcock;N. Cobbett;Paul Breen;D. Danskin;E. Spanswick;Juan V. Rodriguez
分析了位于加拿大丘吉尔的南极-北极辐射带（动态）沉积甚低频大气研究联盟（AARDDVARK）接收器的亚电离层无线电波数据，以确定3 < L < 7范围内电子沉降到大气中的特征。该研究通过结合2010年7月20日至8月20日来自两个美国发射机的信号推进了先前的工作，允许计算导出的电子沉淀通量的误差估计，包括时变电子能谱梯度的应用。来自NOAA POES卫星和地面riometer的电子降水观测为AARDDVARK测量提供了相互比较和背景。AARDDVARK无线电波传播数据显示，从2010年7月27日开始，持续约20天的外辐射带的高能电子降水。用AARDDVARK技术测定大于30 keV的降水通量的不确定度为± 10%。在2010年8月4日开始的最大磁暴的主要和恢复阶段，AARDDVARK导出的降水通量的峰值>30 keV降水通量>105 el cm−2 s−1 sr−1。AARDDVARK观测到的最大通量发生在昼侧，并从地磁扰动开始延迟了几天。在扰动的主要阶段，夜侧通量占主导地位。POES，AARDDVARK和riometer之间的通量估计显着差异后，发现最大的干扰的主要阶段，提供的证据表明，>700千电子伏的电子沉淀发生。目前，这种相对论性电子沉淀的存在引入了一些不确定性的AARDDVARK数据的分析，给出了幂律电子沉淀谱的假设。
Subionospheric radio wave data from an Antarctic‐Arctic Radiation‐Belt (Dynamic) Deposition VLF Atmospheric Research Konsortia (AARDDVARK) receiver located in Churchill, Canada, is analyzed to determine the characteristics of electron precipitation into the atmosphere over the range 3 < L < 7. The study advances previous work by combining signals from two U.S. transmitters from 20 July to 20 August 2010, allowing error estimates of derived electron precipitation fluxes to be calculated, including the application of time‐varying electron energy spectral gradients. Electron precipitation observations from the NOAA POES satellites and a ground‐based riometer provide intercomparison and context for the AARDDVARK measurements. AARDDVARK radiowave propagation data showed responses suggesting energetic electron precipitation from the outer radiation belt starting 27 July 2010 and lasting ~20 days. The uncertainty in >30 keV precipitation flux determined by the AARDDVARK technique was found to be ±10%. Peak >30 keV precipitation fluxes of AARDDVARK‐derived precipitation flux during the main and recovery phase of the largest geomagnetic storm, which started on 4 August 2010, were >105 el cm−2 s−1 sr−1. The largest fluxes observed by AARDDVARK occurred on the dayside and were delayed by several days from the start of the geomagnetic disturbance. During the main phase of the disturbances, nightside fluxes were dominant. Significant differences in flux estimates between POES, AARDDVARK, and the riometer were found after the main phase of the largest disturbance, with evidence provided to suggest that >700 keV electron precipitation was occurring. Currently the presence of such relativistic electron precipitation introduces some uncertainty in the analysis of AARDDVARK data, given the assumption of a power law electron precipitation spectrum.
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
影响因子：
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作者：
Rodger C
通讯作者：
Rodger C