Ionospheric Layers

  • Ionosphere is a region 100 to 400 km above earth
  • Air molecules ionised by ultra violet solar radiation
  • Ionised regions will reflect radio waves by refraction (gradual bending) within the layer
  • Essential for long distance shortwave propagation
  • Ionisation forms into a number of layers
  • Layers vary in height and density and with the seasons and the time of day