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A Case Study of the Ionospheric Disturbance During a Magnetic Storm in Low and Mid-latitude Regions

Shen Changshou; Zi Minyun (Geophysical Department, Peking University, Beijing 100871 ) (The Academy of Arts of China,Beijing 100009)Wu Jian; Suo Yucheng (China Research Institute of Radiowave Propagation, Xinxiang, Henan 453003, China)Gao Yufen (Institute  
Global features of the ionospheric disturbance during a magnetic storm on 7-9 Feb., 1986 are analyzed by using ionosonde data from stations distributed nearby 4 meridian chains. The main mechanism, which leads to the simultaneously sudden enhancement of multi-stationally observed f0F2, is proposed to be the eastward electric field produced by the magnetosphere- ionospheric electrodynamic coupling. The enhancement of the 'fountain effect' which caused by the disturbed equatorial electrojet , also takes an important role to the increase of f0F2 at disturbed period in the bierest of the equatorial anomaly region. During the later period of a magnetic storm, westward electric current and field in lower latitudes prepuced by the ionospheric disturbance dynamo will decrease the electron density in F-region. On the other hand, the weakenning of 'fountain effect' may reduce the value of f0F2 observed in the crest area.
【Fund】: 国家自然科学基金
【CateGory Index】: P352.4
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