Thermal noise occurs in all transmission media and communication equipment, including passive devices. It arises from random electron motion and is characterized by a uniform distribution of energy over the frequency spectrum with a Gaussian distribution of levels.
An occluded front is formed when a cold front overtakes a warm front. and usually form around mature low-pressure areas. The cold and warm fronts curve naturally poleward into the point of occlusion, which is also known as the triple point.
It consists of: â a warm front moving to the northeast. â a cold front moving to the southeast. â region between warm and cold fronts is the warm sector. â the central low pressure (low, which is deepening with time) â overrunning of warm air over the warm front. â cold air surging southward behind the cold front.