Occurrence Characteristics of Low Latitude Ionosphere Irregularities Observed by Impedance Probe on Board the Hinotori Satellite
Occurrence Characteristics of Low Latitude Ionosphere Irregularities Observed by Impedance Probe on Board the Hinotori Satellite
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DOI：
10.5636/jgg.38.125
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
S. Watanabe;H. Oya
中科院分区：
文献类型：
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作者：
S. Watanabe;H. Oya
本文利用日本日鸟卫星上扫频阻抗探头的1000多例观测资料，对等离子体气泡和斑点的发生特征进行了统计分析。结果表明，等离子体气泡的形成具有以下特点。1)等离子体泡出现的空间分布是在以磁赤道为中心的磁倾纬度±30°以内的赤道区，（2）夜间等离子体泡的出现是有限的，等离子体泡形成的有利时期取决于等离子体泡的类型;多重等离子体泡（MPB）倾向于在午夜前产生，而准周期等离子体泡（QPB）在午夜后出现最多。孤立等离子体泡（SPB）的出现与当地时间无关，但在夜间是如此。3）磁活动也控制着等离子体泡的出现; MPB现象的出现使峰值周期随磁活动的增强而向午夜侧移动，QPB现象的出现则表现出其出现范围的扩大，QPB现象的出现时间从午夜到早晨（4）MPB和QPB等离子体泡的出现与F10.7太阳射电通量所代表的太阳辐射通量有明显的相关性，而F10.7与SPB的出现没有关系。等离子体团的出现与等离子体泡的出现具有互补性。等离子体斑点的发生区域被限制在夜间被限制的等离子体气泡发生区域的边缘部分。等离子体斑点的出现随着磁场活动的增加而减少，而等离子体斑点的出现与太阳辐射有很强的反相关性（F10.7）。等离子体气泡和斑点的出现与赤道异常的发展和背景电子密度的不对称分布的关系表明，广义瑞利-泰勒不稳定性的重要性，包括电场和中性风的影响，除了重力的等离子体气泡和斑点的产生。
The statistical analyses of occurrence characteristics of the plasma bubbles and blobs are made by using more than 1000 cases of observation data from the swept frequency impedance probe aboard the Hinotori satellite. The results show that formations of the plasma bubbles have the following characteristics. 1) The spatial distribution of the occurrence of the plasma bubbles is in the equatorial region within ±30° of the magnetic dip latitude centered around the magnetic equator, 2) the occurrence of the plasma bubbles is limited in the nighttime; favorable periods of the plasma bubble formation depend on the type of the plasma bubbles; multiple plasma bubbles (MPB) have tendency to be generated in pre-midnight, while quasi periodic plasma bubbles (QPB) show their maximum occurrence in the post-midnight period. Solitary plasma bubbles (SPB) occur, however, rather independently to the local time in so far as in the night period, 3) the magnetic activity also controls the occurrence of the plasma bubbles; the occurrence of MPB phenomena shifts the peak period to the midnight side with increasing magnetic activity and the occurrence of QPB phenomena which covers the period from midnight to the morning side shows the expansion of their occurrence into late morning period with increasing magnetic activity, 4) correlation of the occurrence of the plasma bubbles to the solar radiation flux represented by F10.7 solar radio flux is evident for MPB and QPB while there is no relation between F10.7 and the occurrence of SPB. Occurrence of the plasma blobs has a complementary nature with that of the plasma bubbles. The occurrence region of the plasma blobs is limited in the edge parts of the plasma bubble occurrence region being limited in the nighttime. The occurrence of the plasma blobs decreases with increasing magnetic activity, while there is a strong anti-correlation of the occurrence of the plasma blobs to the solar radiation (F10.7). The relation of occurrence of the plasma bubbles and blobs to the development of the equatorial anomaly and the asymmetrical distributions of the background electron density suggests the importance of the generalized Rayleigh-Taylor instability including the effects of the electric field and the neutral wind in addition to the gravitational force for the generation of the plasma bubbles and blobs.