Properties of Lightning Generated Whistlers Based on Van Allen Probes Observations and Their Global Effects on Radiation Belt Electron Loss
Properties of Lightning Generated Whistlers Based on Van Allen Probes Observations and Their Global Effects on Radiation Belt Electron Loss
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DOI：
10.1029/2020gl089584
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发表时间：
2020-09-16
影响因子：
5.2
通讯作者：
Hospodarsky, G. B.
中科院分区：
文献类型：
--
作者：
Green, A.;Li, W.;Hospodarsky, G. B.
闪电产生的哨声（LGW）在地球内部辐射带及更远的地方沉淀高能电子方面起着重要的作用。从货车艾伦探针的波爆发数据被用来明确地识别LGW和分析其属性在L < 4通过扩展其频率下降到类似于100利兹的第一次。统计结果表明，LGW的出现频率一般在100 Hz ~ 10 kHz之间，其主波功率低于赤道低混合共振频率; LGW的振幅在L < 3处较强，在夜侧的出现率可达30%左右。寿命计算表明，在L <2.5时，LGW在几十keV到几MeV的电子散射中起着重要的作用。我们新构建的LGW模型对于评估LGW对L <4的高能电子损失的全球影响至关重要。简单的语言摘要在初始雷击之后，产生一种类型的等离子体波，通常被称为闪电产生的哨声（LGW），其中一部分可以传播到近地空间。这些波可以与地球辐射带中被捕获的高能电子群相互作用，引起俯仰角散射，从而在高能电子损失到地球高层大气中发挥重要作用。利用双货车艾伦探测器在整个货车艾伦探测器时代（2012-2019）的高分辨率波爆发数据，我们评估了LGW的典型属性和全球分布。新构建的LGW模型被用来量化其全球影响的高能电子损失在近地空间，并表明LGW发挥了重要的作用，在散射电子在一个广泛的能量范围内（几十千电子伏到几兆电子伏）的内辐射带和超越。
Lightning generated whistlers (LGWs) play an important role in precipitating energetic electrons in the Earth's inner radiation belt and beyond. Wave burst data from the Van Allen Probes are used to unambiguously identify LGWs and analyze their properties at L < 4 by extending their frequencies down to similar to 100 liz for the first time. The statistical results show that LGWs typically occur at frequencies from 100 Hz to 10 kHz with the major wave power below the equatorial lower hybrid resonance frequency, and their wave amplitudes are typically strong at L < 3 with an occurrence rate up to similar to 30% on the nightside. The lifetime calculation indicates that LGWs play an important role in scattering electrons from tens of keV to several MeV at L < similar to 2.5. Our newly constructed LGW models are critical for evaluating the global effects of LGWs on energetic electron loss at L < 4.Plain Language Summary After initial lightning strikes, a type of plasma wave is generated, typically referred to as a lightning generated whistler (LGW), a portion of which can propagate into near-Earth space. These waves can interact with the trapped energetic electron population in the Earth's radiation belts, causing pitch angle scattering, and thus play an important role in energetic electron loss into the Earth's upper atmosphere. Using high-resolution wave burst data from the twin Van Allen Probes over the entire Van Allen Probes era (2012-2019), we evaluate the typical properties and global distributions of LGWs. The newly constructed LGW models are used to quantify their global effects on energetic electron loss in the near-Earth space and indicate that LGWs play an important role in scattering electrons over a broad energy range (tens of keV to several MeV) in the inner radiation belt and beyond.