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Table 1 Kannuslehto campaigns used in the present study

From: Ground-based VLF wave intensity variations investigated by the principal component analysis

Campaign From To # days with full measurements
1 7 October 2016 25 April 2017 174
2a 1 September 2017 18 October 2017 44
2b 9 November 2017 26 April 2018 150
3 29 August 2018 25 April 2019 232
4 4 September 2019 24 April 2020 225