| 31. | This form of ray tracing involves the anisotropic media such as the ionosphere.
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| 32. | Rawer's code assumes zig-zag paths between Earth and ionosphere.
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| 33. | Its primary mission is to count electrons in the Earth's ionosphere.
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| 34. | The study of planets also includes magnetospheres and ionospheres.
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| 35. | This led to the discovery of HF radio propagation via the ionosphere in 1923.
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| 36. | The ionosphere is traditionally very difficult to measure.
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| 37. | Instead, some radio waves are affected by the ionosphere in the upper atmosphere.
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| 38. | It studied auroral phenomena and the polar ionosphere.
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| 39. | At lower frequencies, the ionosphere is opaque.
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| 40. | The ionosphere, geomagnetism and aurorae were studied.
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