Theoretical study of the ionospheric Weddell Sea Anomaly using SAMI2

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Title:	Theoretical study of the ionospheric Weddell Sea Anomaly using SAMI2
Authors:	Chen,CH;Huba,JD;Saito,A;Lin,CH;Liu,JY
Contributors:	太空科學研究所
Keywords:	MODEL;ATMOSPHERE;F2-LAYER;MIDDLE;RADAR
Date:	2011
Issue Date:	2012-03-27 17:32:52 (UTC+8)
Publisher:	國立中央大學
Abstract:	The ionospheric Weddell Sea Anomaly (WSA) was first reported more than five decades ago based on ionosonde data near the Antarctica peninsula. The WSA is an ionospheric structure characterized by a larger nighttime electron density than daytime density. Recent satellite observations indicate that the WSA can extend from South America and Antarctica to the central Pacific. The major physical mechanisms that have been suggested for the WSA formation are an equatorward neutral wind, an electric field, the photoionization, and the downward diffusion from the plasmasphere. On the basis of the theoretical modeling performed in this study using the SAMI2 model, an equatorward neutral wind is identified as the major cause of the WSA, while the downward flux from the plasmasphere provides an additional plasma source to enhance or maintain the density of the anomalous structure.
Relation:	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Appears in Collections:	[Graduate Institute of Space Science] journal & Dissertation

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