Fig. 26From: Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radarsRay-tracing analysis (solid curves) and expected locations for ionospheric irregularity backscatter occurrence (asterisks) for HOK during nighttime quiet geomagnetic conditions and transmission frequencies of (top to bottom) 9, 11, and 13 MHz, respectively. Adapted from Fig. 3 of Nishitani and Ogawa (2005)Back to article page