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Weak Ionization of the Global Ionosphere in Solar Cycle 24 : Volume 32, Issue 7 (21/07/2014)

By Hao, Y. Q.

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Book Id: WPLBN0004002484
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Weak Ionization of the Global Ionosphere in Solar Cycle 24 : Volume 32, Issue 7 (21/07/2014)  
Author: Hao, Y. Q.
Volume: Vol. 32, Issue 7
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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Zhang, D. H., Xiao, Z., Shi, H., & Hao, Y. Q. (2014). Weak Ionization of the Global Ionosphere in Solar Cycle 24 : Volume 32, Issue 7 (21/07/2014). Retrieved from

Description: Department of Geophysics, Peking University, Beijing, China. Following prolonged and extremely quiet solar activity from 2008 to 2009, the 24th solar cycle started slowly. It has been almost 5 years since then. The measurement of ionospheric critical frequency (foF2) shows the fact that solar activity has been significantly lower in the first half of cycle 24, compared to the average levels of cycles 19 to 23; the data of global average total electron content (TEC) confirm that the global ionosphere around the cycle 24 peak is much more weakly ionized, in contrast to cycle 23. The weak ionization has been more notable since the year 2012, when both the ionosphere and solar activity were expected to be approaching their maximum level. The undersupply of solar extreme ultraviolet (EUV) irradiance somewhat continues after the 2008–2009 minimum, and is considered to be the main cause of the weak ionization. It further implies that the thermosphere and ionosphere in the first solar cycle of this millennium would probably differ from what we have learned from the previous cycles of the space age.

Weak ionization of the global ionosphere in solar cycle 24

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