TY - JOUR A1 - Rishbeth, H. A1 - Sedgemore-Schulthess, K. J. F. A1 - Ulich, T. T1 - Semiannual and annual variations in the height of the ionospheric F2-peak JO - Ann. Geophys. J1 - ANGEO VL - 18 IS - 3 SP - 285 EP - 299 Y1 - 2000/03/31 PB - Springer Verlag SN - 1432-0576 UR - https://angeo.copernicus.org/articles/18/285/2000/ L1 - https://angeo.copernicus.org/articles/18/285/2000/angeo-18-285-2000.pdf DO - 10.1007/s00585-000-0285-6 ER -