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Does the Magnetosphere Behave Differently on Weekends? : Volume 20, Issue 8 (30/11/-0001)

By Karinen, A.

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Book Id: WPLBN0004000940
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: Does the Magnetosphere Behave Differently on Weekends? : Volume 20, Issue 8 (30/11/-0001)  
Author: Karinen, A.
Volume: Vol. 20, Issue 8
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Ulich, T., Manninen, J., Mursula, K., & Karinen, A. (-0001). Does the Magnetosphere Behave Differently on Weekends? : Volume 20, Issue 8 (30/11/-0001). Retrieved from http://members.worldlibrary.net/


Description
Description: Department of Physical Sciences, P.O. Box 3000, University of Oulu, FIN-90014 Oulu, Finland. Global geomagnetic activity has been suggested to be enhanced during weekends above the weekly average after 1930. Before the 1930s, weekends and weekdays were found to be equally active. This so-called "weekend effect" was suggested to be due to power line harmonic radiation (PLHR) in the VLF range emitted by electric power lines. Since the consumption of electric power is different on weekends and weekdays, leading to different PLHR intensities, this could possibly cause the "weekend effect" in global geomagnetic activity. In the present paper, we reanalyse the suggested "week-end effect" in global geomagnetic activity using the 69-year planetary geomagnetic Ap index and the 131-year antipodal aa index. We conclude that there is no statistically significant "weekend effect" during the interval covered by these geo-magnetic activity indices. Although global geomagnetic activity is slightly enhanced on weekends from the 1930s to the 1980s, the more recent data show rather a relative decrease in global geomagnetic activity on weekends, contrary to the expected increase in the "weekend effect", due to increasing power consumption. Moreover, the weekly distribution is fairly similar in solar wind speed and global geomagnetic activity during the last 35 years, further supporting the view that the "weekend effect" is only a statistical fluctuation.

Key words. Geomagnetism and paleomagnetism (time variations, diurnal to secular) – Magnetospheric physics (planetary magnetospheres; storms and substorms)


Summary
Does the magnetosphere behave differently on weekends?

 

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