SOLAR SYSTEM

Detailed explanation-1: -Noise Temperature (Te) is a way to express noise of a system in terms of an equivalent temperature. It is not the physical temperature of a system but is a theoretical value that defines an equivalent temperature required to produce a specific amount of noise power in that system.

Detailed explanation-2: -The Sun is a strong variable noise source with a noise temperature of about 106 K at 50 to 200 MHz and at least 104 K at 10 GHz under quiet Sun conditions. Large increases occur when the Sun is disturbed.

Detailed explanation-3: -Antenna gain-to-noise-temperature (G/T) is a figure of merit in the characterization of antenna performance, where G is the antenna gain in decibels at the receive frequency, and T is the equivalent noise temperature of the receiving system in kelvins.

Detailed explanation-4: -The noise temperature of the ground is much higher than that of the night sky because of its much higher physical temperature. The ground noise temperature is about 300a K and it varies during the day.