Meteor burst and other long distance high latitude propagation modes in the low VHF band

摘要

We have analysed the duty cycle from very high frequency polar cap and auroral paths in Greenland. We find that at 35 MHz and 45 MHz the path is often sustained by sporadic E-layers rather than by meteor scatter. At the higher frequencies of 65 MHz and 85 MHz we find that the path is generally dominated by meteor scatter modes. The diurnal, seasonal and geomagnetic variations of sporadic E have been examined and off line decision aid models have been derived to evaluate the magnitude of multiple mechanism propagation on the paths.