Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 33, issue 1
Articles | Volume 33, issue 1
https://doi.org/10.5194/angeo-33-31-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-33-31-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 33, issue 1
Regular paper
 | 
09 Jan 2015
Regular paper |  | 09 Jan 2015

Spectrum analysis of short-period K index behaviour at high and mid-latitudes

P. B. Kotzé

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Short summary
In this study we performed a wavelet and Lomb-Scargle analysis of the geomagnetic activity K-index at Lerwick (LER), Hermanus (HER) and Canberra (CNB) for the period between 1960 and 2010, overlapping with solar cycles 20 to 23. Daily mean K indices are used to identify how several harmonics of the 27.0-day recurrent period change during each solar cycle when comparing high- and mid-latitude geomagnetic activity, applying a 95% confidence level.
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