LOWER IONOSPHERIC DISTURBANCES OBSERVED IN LONG-DISTANCE VLF TRANSMISSION AT MIDDLE LATITUDE

被引:22
作者
MURAOKA, Y
机构
[1] Department of Physics, Hyogo College of Medicine, Nishinomiya, Hyogo, 663, Mukogawa-cho
来源
JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS | 1979年 / 41卷 / 09期
关键词
D O I
10.1016/0021-9169(79)90106-5
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
An attempt is made to investigate disturbances in the relative phase of long-distance, cesium-controlled, VLF radio wave propagation from NLK (Jim Creek, U.S.A.) to HCM (Nishinomiya, Japan). The propagation path covers a longitudinal range of about 100° and ranges from L~ 1.2 to L ~ 3.2 in invariant latitude. VLF phase disturbances following major geomagnetic storms indicate that the altitudinal and latitudinal extents of ionization enhancement in the D-region depend on the strength of the storm. The after-effect observed in the night-time VLF phase becomes pronounced especially in winter condition of the D-region. There is another type of VLF phase disturbance in the night-time which is not related to storm but associated with the winter anomaly observed in the daytime at middle latitudes (40°-45°N) but below L = 2. This result suggests that the enhanced ionization occurs in the D-region above about 80 km not only in the daytime but also in the night-time for a group of winter anomalous days. It is likely that the main cause of the enhanced ionization is related to the vertical propagation of planetary waves into the mesosphere, resulting in a sudden warming. © 1979.
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页码:1031 / 1042
页数:12
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