TY - JOUR A1 - Makarevich, R. A. A1 - Carter, B. A. T1 - HF echo types revisited: aspect angle attenuation effects JO - Ann. Geophys. J1 - ANGEO VL - 27 IS - 8 SP - 3065 EP - 3075 Y1 - 2009/08/06 PB - Copernicus Publications SN - 0992-7689 UR - http://www.ann-geophys.net/27/3065/2009/ L1 - http://www.ann-geophys.net/27/3065/2009/angeo-27-3065-2009.pdf ER -