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The Intermediate Layers and Associated Tidal Motions Observed by a Digisonde in the Equatorial Anomaly Region : Volume 21, Issue 4 (30/11/-0001)

By Lee, C.-c.

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Book Id: WPLBN0004001119
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: The Intermediate Layers and Associated Tidal Motions Observed by a Digisonde in the Equatorial Anomaly Region : Volume 21, Issue 4 (30/11/-0001)  
Author: Lee, C.-c.
Volume: Vol. 21, Issue 4
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Pan, C., Hsu, H., Lee, C., & Liu, J. (-0001). The Intermediate Layers and Associated Tidal Motions Observed by a Digisonde in the Equatorial Anomaly Region : Volume 21, Issue 4 (30/11/-0001). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute of Space Science, National Central University, NO. 300, Jung-da Rd., Chung-Li 320, Taiwan. This investigation presents an initial attempt to analyze a full year of daily ionosonde observations relevant to the determination of plasma densities, tidal structures, and ion transports in the equatorial anomaly region of the lower ionosphere. Particular focus is on the intermediate layers, their seasonal and diurnal variations, and cause-effect relationships. The ionogram database was recorded using a digisonde portable sounder (DPS) at National Central University (NCU, 24 °58' N, 121°11' E) during 1996. Statistical results indicate that the intermediate layers appear primarily during the daytime of the spring/winter months. The monthly median height characteristics reveal that the layers descend from high to low altitudes and different tidal motions control the layers in different months. Generally, the semi-diurnal and quarter-diurnal tides, which cause ionization convergence, are mainly in the spring/winter and summer/autumn months, respectively. Variations in the electron densities of the layers also indicate that the density increases could result from a great number of molecular and metallic ions. Furthermore, a novel approach to ionogram presentation is introduced to investigate the intermediate layers. This approach allows the DPS to characterize the detailed daily information of the intermediate layers.

Key words. Ionosphere (equatorial ionosphere; ionosphere-atmosphere interactions; ionospheric irregularities)


Summary
The intermediate layers and associated tidal motions observed by a digisonde in the equatorial anomaly region


 

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