Radiation, Solar and Lunar
Solar Radiation: electromagnetic radiation emanating from the Sun with emphasis on microwaves.
Lunar Radiation: electromagnetic radiation from the Moon with emphasis on thermal emission in the microwave portion of the spectrum.
The Sun is a relatively typical star located about two thirds of the galactic radius from the center of the spiral (Aarons, 1965; Chap. 1). To a first approximation, the Sun has an effective temperature of about 5,800 K. This is the temperature of a thermal source with the same total flux (3.9 × 1026 W). At this temperature, the radiation peak is in the visible portion of the spectrum (λ = 470 nm). However, the Sun is a dynamic structure that does not meet the conditions for thermal equilibrium, and there are considerable departures from this behavior, for example, in the UV (Aarons, 1965; Chap. 1) and in the microwave portion of the spectrum at wavelengths greater than about 1 cm (Kraus, 1966; Chap. 8.7). The level of...
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