solar noise

Electromagnetic radiation noise received from the Sun. Note 1: Solar noise can interfere with radio, television, microwave, and lightwave communications. All solar radiation is electromagnetic. The infrared and visible wavelengths are perhaps the most beneficial. The higher frequencies may destroy living tissue and can cause genetic changes. Solar noise is by far the most prominent cosmic noise, i.e., radio noise, source. At one gigahertz (1 GHz), the solar noise temperature is approximately 2.8 × 10⁵ K (kelvin). This decreases in a nearly logarithmic manner to 6 × 10³ K at 30 GHz. When an antenna beamwidth is less than 0.5°, which is the angle subtended by the Sun from the Earth, the solar noise temperature is given by the relation T _sn = (1.96/f) · 10¹⁴. This relation is obtained from T _sn /290 = (675/f) × 10⁹ where T _sn is the solar noise temperature in kelvin and f is the frequency in hertz. Note 2:Solar noise is more likely to be induced in radio, wireline, and microwave systems...