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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Singular plasma disturbances in the low-latitude F region
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Singular plasma disturbances in the low-latitude F region

机译：低纬度F区的奇异等离子体扰动

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We describe here a new phenomenon characterized by unusual patterns of ion drifts inside ion density depletion regions observed by the AE-E satellite in the low-latitude F region. In about 30 depletions, vertical ion drift relative to the background was upward on the western sides, downward on the eastern sides, and zero near the middle where the density depletion was greatest. These drift characteristics are distinct from those observed in plasma bubble depletions. The structures reported here were observed on circular orbits below 300 km altitude and had density depletions of up to 2 orders of magnitude or more below the ambient ion density. The upward and downward drift excursions were up to 200 m/s relative to the background. Almost all these structures were observed over oceans or near coasts and largely between +-10deg and +-30deg dip latitude. The structures were observed mostly as isolated, single depletion regions with the majority of them about 250 km wide in the east-west direction. They occurred during quiet magnetic conditions with near-equal occurrence frequencies in the premidnight and postmidnight periods. The characteristic density and drift signatures indicate westward propagating disturbances in which the bottomside F layer is first lifted and then returned back to its original position, leaving the ionosphere undisturbed after the disturbance passes by. The estimated speed of these disturbances is of the order of 200 m/s. These unique solitary plasma disturbances, which we designate as singular plasma disturbances, are associated with a propagating source of E*B drift, not driven by neutral perturbations at the altitude of observation.
机译：我们在这里描述一种新现象，其特征是在低纬度F区域的AE-E卫星观测到的离子密度耗尽区内的离子漂移异常。在大约30种耗尽中，相对于本底的垂直离子漂移在西侧是向上，在东侧是向下，而在密度耗尽最大的中部附近为零。这些漂移特性与等离子体气泡耗尽中观察到的漂移特性不同。此处报道的结构是在海拔300 km以下的圆形轨道上观察到的，其密度消耗比环境离子密度低2个数量级或更多。相对于背景，向上和向下漂移偏移高达200 m / s。几乎所有这些结构都在大洋或近海岸上观测到，且倾角在+ -10度和+ -30度之间。观察到的结构大部分是孤立的单个耗尽区，其中大多数沿东西方向宽约250 km。它们发生在安静的磁性条件下，在午夜之前和午夜之后的发生频率几乎相等。特征密度和漂移特征表明向西传播的扰动，其中首先抬升底面F层，然后返回到其原始位置，使电离层在扰动经过后不受干扰。这些干扰的估计速度约为200 m / s。这些独特的孤立性等离子体扰动，我们称为奇异等离子体扰动，与传播的E * B漂移源有关，而不是由观测高度的中性扰动驱动。

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