TY - JOUR A1 - Voiculescu, M. A1 - Aikio, A. T. A1 - Nygrén, T. A1 - Ruohoniemi, J. M. T1 - IMF effect on sporadic-E layers at two northern polar cap sites: Part I – Statistical study JO - Ann. Geophys. J1 - ANGEO VL - 24 IS - 3 SP - 887 EP - 900 Y1 - 2006/05/19 PB - Copernicus Publications SN - 1432-0576 UR - https://angeo.copernicus.org/articles/24/887/2006/ L1 - https://angeo.copernicus.org/articles/24/887/2006/angeo-24-887-2006.pdf DO - 10.5194/angeo-24-887-2006 ER -