TY - JOUR A1 - Kotzé, P. B. T1 - Spectrum analysis of short-period K index behaviour at high and mid-latitudes JO - Ann. Geophys. J1 - ANGEO VL - 33 IS - 1 SP - 31 EP - 37 Y1 - 2015/01/09 PB - Copernicus Publications SN - 1432-0576 UR - https://angeo.copernicus.org/articles/33/31/2015/ L1 - https://angeo.copernicus.org/articles/33/31/2015/angeo-33-31-2015.pdf DO - 10.5194/angeo-33-31-2015 ER -