TY - JOUR A1 - Střeštík, J. T1 - Spectrum of geomagnetic activity in the period range 5−60 days: possible lunar influences JO - Ann. Geophys. J1 - ANGEO VL - 16 IS - 7 SP - 804 EP - 811 Y1 - 1998/07/31 PB - Springer Verlag SN - 1432-0576 UR - https://angeo.copernicus.org/articles/16/804/1998/ L1 - https://angeo.copernicus.org/articles/16/804/1998/angeo-16-804-1998.pdf DO - 10.1007/s00585-998-0804-4 ER -