Comparisons between ion distributions retrieved from ENA images of the ring current and contemporaneous, multipoint ion measurements recorded in situ during the major magnetic storm of 15 May 2005
Comparisons between ion distributions retrieved from ENA images of the ring current and contemporaneous, multipoint ion measurements recorded in situ during the major magnetic storm of 15 May 2005
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从环电流 ENA 图像中检索到的离子分布与 2005 年 5 月 15 日主要磁暴期间现场记录的同期多点离子测量值之间的比较
DOI：
10.1029/2010ja015770
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发表时间：
2010-12
期刊：
影响因子：
--
通讯作者：
G. D. Reeves
中科院分区：
文献类型：
--
作者：
3. Lu;L.;S. McKenna-Lawlor;S. Barabash;P. C. Br;t;J. Balaz;Z. X. Liu;Z. H. He;G. D. Reeves
TC-2 航天器上的中性原子探测器单元 (NUADU) 在 2005 年 5 月 15 日的一次主要磁暴的主要阶段和恢复阶段中记录了 3 小时的高能中性原子 (ENA) 图像数据。采用定制设计的约束线性反演方法来检索 ENA 记录中的环流离子分布，直至 L = 6.6。然后，对从这些 ENA 数据（能量范围 50-81 keV 和 81-158 keV）检索到的离子通量与由洛斯阿拉莫斯国家实验室（LANL）发射的一系列地球同步卫星上的同步轨道粒子分析仪（SOPA）仪器在原位测量的互补同期粒子通量进行了比较，这些卫星在 L ∼ 6.6 处发射环绕赤道面。 ENA 数据显示，在风暴的主阶段出现了两个发射峰值，这对应于一对粒子注入从磁尾的到来。在每种情况下，这些注射均在达到相应的 AL 指数振幅峰值之前达到最大值。风暴的主要阶段在这对事件发生后结束（Dst ≈ -256 nT），此后环流离子通量在几个小时内逐渐衰减（风暴恢复阶段）。这是首次使用在不同磁本地时间进行的多点原位测量对针对 NUADU 数据开发的线性反演方法进行全球验证。结果发现，黄昏/夜间的导出通量值越高，它们就越接近现场测量。然而，在黄昏/夜间获得的通量往往仍然被低估，因为相关的 ENA 测量是在环形电流的外边缘周围进行的，其高度是内磁层中的磁场偏离反演过程中假定的偶极子配置的高度。用于研究大型磁暴期间离子的两种方法是互补的，因为检索到的离子通量提供了有关环电流事件变化的大规模结构的高时间分辨率信息，而原位通量采样则提供了各个环电流内特定位置的“测量真相”。
The Neutral Atom Detector Unit (NUADU) aboard the TC‐2 spacecraft recorded energetic neutral atom (ENA) image data for 3 h during part of the main and recovery phases of a major magnetic storm on 15 May 2005. A custom designed, constrained linear inversion method was applied to retrieve ring current ion distributions in the ENA records out to L = 6.6. Comparisons were then made between the ion fluxes retrieved from these ENA data (energy ranges 50–81 keV and 81–158 keV) and complementary, contemporaneous particle fluxes measured in situ by Synchronous Orbit Particle Analyzer (SOPA) instruments aboard a series of geosynchronous satellites that were launched to encircle the equatorial plane at L ∼ 6.6 by the Los Alamos National Laboratory (LANL). The ENA data revealed the development of two emission peaks during the main phase of the storm which corresponded to the arrival from the magnetotail of a pair of particle injections. These injections reached, in each case, maximum value before the corresponding AL index amplitude peak was attained. The main phase of the storm concluded (Dst ≈ −256 nT) in the aftermath of this event pair, and the ring current ion fluxes thereafter gradually decayed over several hours (the storm recovery phase). This is the first time that the linear inversion method developed for NUADU data has been globally validated using multipoint in situ measurements made at different magnetic local times. It was found that the higher the derived flux values were on the duskside/nightside, the closer they were to the in situ measurements. The retrieved fluxes obtained on the duskside/nightside tended, however, to be still somewhat underestimated since the ENA measurements concerned were made around the outer edge of the ring current at an altitude where the magnetic field in the inner magnetosphere deviates from that dipole configuration assumed in the inversion procedure to pertain there. The two methods utilized to study ions during a large magnetic storm are complementary in that the retrieved ion fluxes provide high time resolution information concerning the changing, large‐scale structure of ring current events, whereas in situ flux sampling presents “measurement truth” at particular locations within individual ring currents.
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影响因子：
1.9
作者：
S. McKenna-Lawlor;Lu Li;S. Barabash;K. Kudela;J. Balaz;I. Strhárský;K. Brinkfeldt;H. Gunell;C. Shen;Jiankui Shi;J.-B. Cao;Q. Zong;S. Fu;E. Roelof;P. Brandt;I. Dandouras
通讯作者：
S. McKenna-Lawlor;Lu Li;S. Barabash;K. Kudela;J. Balaz;I. Strhárský;K. Brinkfeldt;H. Gunell;C. Shen;Jiankui Shi;J.-B. Cao;Q. Zong;S. Fu;E. Roelof;P. Brandt;I. Dandouras
根据 TC-2/NUADU 仪器记录的能量中性原子 (ENA) 图像迭代反演全球磁层信息
DOI：
10.1007/s11431-008-0264-9
发表时间：
2008-09
期刊：
Chin. Sci.
影响因子：
--
作者：
路立
通讯作者：
路立
影响因子：
10.3
作者：
Paul H. Smith;N. Bewtra
通讯作者：
Paul H. Smith;N. Bewtra
影响因子：
2.8
作者：
Tsyganenko, NA
通讯作者：
Tsyganenko, NA
影响因子：
2.2
作者：
Chengcai Shen;Z. Liu
通讯作者：
Chengcai Shen;Z. Liu