Daytime F2-layer negative storm effect: what is the difference between storm-induced and Q-disturbance events?
Daytime F2-layer negative storm effect: what is the difference between storm-induced and Q-disturbance events?
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DOI：
10.5194/angeo-25-1531-2007
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发表时间：
2007-07
影响因子：
1.9
通讯作者：
A. Mikhailov;A. Depueva;V. Depuev
中科院分区：
文献类型：
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作者：
A. Mikhailov;A. Depueva;V. Depuev
摘要。与地磁活动和安静时间扰动（q -扰动）有关的负f2层风暴属于不同的事件类别，表现出不同的形态。与通常的负f2层风暴不同，中纬度日间q扰动表现出NmF2和hmF2的同相变化。对米尔斯通山ISR观测的通常扰动和q扰动的分析表明，这两类事件在控制气动参数变化方面存在差异。在q干扰事件中，原子氧浓度的降低是hmF2低于月平均水平的主要原因。与通常的负风暴不同，在q扰动条件下，负效应发生在整个上层电离层。这种差异是由于两种情况下的有效等离子体尺度高度不同。秋分前后常见的负f2层扰动和冬至前后常见的q层扰动聚类，以及两类扰动发生的纬向差异是由于其不同的形成机制所致。
Abstract. Negative F2-layer storms related to geomagnetic activity and quiet-time disturbances (Q-disturbances) belong to different classes of events and exhibit different morphology. Mid-latitude daytime Q-disturbances, unlike the usual negative F2-layer storms, demonstrate NmF2 and hmF2 in-phase variations. An analysis of Millstone Hill ISR observations for usual and Q-disturbances has shown the difference in the controlling aeronomic parameter variations for the two classes of events. The decrease in atomic oxygen concentration provides the main contribution to the hmF2 decrease below the monthly median level during Q-disturbance events. Unlike the usual negative storms, the negative effect takes place in the whole topside ionosphere under Q-disturbance conditions. The difference is due to different effective plasma scale heights in the two cases. Clustering of the usual negative F2-layer disturbances around equinoxes and Q-disturbances around winter solstice, as well as different latitudinal variations for the occurrence of the two types of disturbances is due to their different formation mechanisms.