电子空穴对电磁辐射的向下输运？
Downward transport of electromagnetic radiation by electron holes?
摘要：
一个有吸引力的机制辐射传输的电子空穴从磁层极光腔源区到电离层，甚至可能到大气层的检查。由于X模式的激发和传播特性，对于频率刚好低于局部电子回旋频率$ω\lesssim ω_{ce}$的辐射的通常共振激发，这种机制被证明是非常不可能的。只有当极光电离层局部穿孔，密度足够低，允许电子空穴随极光电子束向下移动到低海拔时，它才能起作用。如果更高的电子回旋谐波$ω\sim \ell ω_{ce}, ~\ell= 2,3,...$的共振激发成为可能，这是一种尚未探索的机制，那么在洞内激发的辐射可以被传输到比产生的更低的高度。如果发生这种情况，辐射将提供另一种磁层等离子体和大气之间的耦合机制。保留字：电子回旋脉塞，电子空穴，极光加速，极光辐射精细结构，极光千米辐射，木星射电辐射，行星射电辐射
英文摘要：
An attractive mechanism for radiation transport by electron holes from the magnetospheric auroral cavity source region down to the ionosphere and possibly even down to the atmosphere is examined. Because of the excitation and propagation properties of the X mode, this mechanism turns out to be highly improbable for the usual resonant excitation of radiation of frequency just below the local electron cyclotron frequency, $ω\lesssim ω_{ce}$. It could work only, if the auroral ionosphere would be locally perforated being of sufficiently low density for allowing electron holes riding down to low altitudes on the auroral electron beam. If resonant excitation of higher electron cyclotron harmonics, $ω\sim \ell ω_{ce}, ~\ell= 2,3,...$, becomes possible, a still unexplored mechanism, then radiation excited inside the hole could be transported to lower altitudes than generated. If this happens, radiation would provide another mechanism of coupling between the magnetospheric plasma and the atmosphere. Keywords: Electron cyclotron maser, electron holes, auroral acceleration, auroral radiation fine structure, auroral kilometric radiation, Jupiter radio emission, Planetary radio emission
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