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.
But on occasion, a cool air mass might build up over eastern Canada and sink southward through northern New York and New England. The result is a cold front that advances toward the west and south. Such a scenario is called a âback doorâ cold front and usually occurs during the spring and summer months. In the spring, when many are yearning for milder temperatures to take hold, a back door front is looked upon as set-back, with temperatures falling from unseasonably balmy levels back to chilly or even cold levels.