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Climatological Features of Electron Density in the Polar Ionosphere from Long-term Observations of Eiscat/Esr Radar : Volume 25, Issue 12 (02/01/2008)

By Cai, H. T.

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Book Id: WPLBN0004001621
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Climatological Features of Electron Density in the Polar Ionosphere from Long-term Observations of Eiscat/Esr Radar : Volume 25, Issue 12 (02/01/2008)  
Author: Cai, H. T.
Volume: Vol. 25, Issue 12
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Ma, S. Y., Fan, Y., Liu, Y. C., Cai, H. T., & Schlegel, K. (2008). Climatological Features of Electron Density in the Polar Ionosphere from Long-term Observations of Eiscat/Esr Radar : Volume 25, Issue 12 (02/01/2008). Retrieved from

Description: School of Electronics Information, Wuhan University, 430079, China. In this paper, climatological features of the polar F2-region electron density (Ne) are investigated by means of statistical analysis using long-term observations from the European Incoherent Scatter UHF radar (called EISCAT in the following) and the EISCAT Svalbard radar (ESR) during periods of quiet to moderate geomagnetic activity. Field-aligned measurements by the EISCAT and ESR radars operating in CP-1 and CP-2 modes are used in this study, covering the years 1988–1999 for EISCAT and 1999–2003 for ESR. The data are sorted by season (equinox, summer and winter) and solar cycle phase (maximum, minimum, rising and falling). Some novel and interesting results are presented as follows: (1) The well-known winter anomaly is evident during the solar maximum at EISCAT, but it dies out at the latitude of the ESR; (2) The daytime peaks of Ne at EISCAT for all seasons during solar maximum lag about 1–2 h behind those at ESR, with altitudes about 10–30 km lower. (3) In addition to the daytime peak, it is revealed that there is another peak just before magnetic midnight at ESR around solar maximum, especially in winter and at equinox. The day-time ionization peak around magnetic noon observed by ESR can be attributed to soft particle precipitation in the cusp region, whereas the pre-midnight Ne maximum seems likely to be closely related to substorm events which frequently break out during that time sector, in particular for the winter case. (4) Semiannual variations are found at EISCAT during solar minimum and the falling phase of the solar cycle; at the rising phase, however, the EISCAT observations show no obvious seasonal variations.

Climatological features of electron density in the polar ionosphere from long-term observations of EISCAT/ESR radar

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