It is a term used to order, in some way, all the processes that lead to the massive knowledge or suffering of something. It applies to many contextualizations, but one of the most common focuses on the spread of viruses or bacteria (becoming epidemics). The spread of disease usually occurs in precarious conditions and with a medical condition that is contagious; therefore, it is important to take active and effective protection measures. Epidemics are a serious threat to the inhabitants of the affected area, so the authorities always intervene when they start.
Likewise, there is a phenomenon that collaborates in the process of transmitting waves, so that they arrive from the transmitter to the receiver. It is characterized by extending through the different layers that protect the earth and that are part of the atmosphere, such as the ionosphere, lithosphere, biosphere and troposphere. The ionosphere, for its part, is one of the highest parts of the atmosphere, in addition to being made up mostly of ions; which in turn contribute to the propagation of waves when they reflect radioelectric waves, which do not exceed a Maximum Usable Frequency.
Similarly, the ionosphere consists of layer D, E and F, the latter transforming into two different layers during the night. The most interesting thing about these layers is that they appear and disappear, depending on whether it is night or day. However, the most important of them is the E layer, becoming the one that reflects radio waves.
