Titlebook: Effects of Ionospheric Scattering on Very-Long-Distance Radio Communication; H. A. Whale Book 1969 Springer Science+Business Media New Yor

精确

asthma

阻挡

Introduction, portions of the path may not present a very serious obstacle to obtaining a reasonable estimate of the behaviour of radio waves in traversing it because some idea of the properties of the unknown regions may be obtained by interpolating between those regions where the characteristics of the ionosphere are known.

不法行为

somnambulism

,Spherical Earth Propagation — The Idealized Case,surface of the earth is called a . We need not consider the actual hops at this stage but merely note that the projection of the path on to the surface of the earth (the “trace” of the path) is a great circle.