TY - JOUR A1 - Bremer, J. T1 - Trends in the ionospheric E and F regions over Europe JO - Ann. Geophys. J1 - ANGEO VL - 16 IS - 8 SP - 986 EP - 996 Y1 - 1998/08/31 PB - Springer Verlag SN - 1432-0576 UR - https://angeo.copernicus.org/articles/16/986/1998/ L1 - https://angeo.copernicus.org/articles/16/986/1998/angeo-16-986-1998.pdf DO - 10.1007/s00585-998-0986-9 ER -