Studying the phenomenon of "solar activity", scientists often use terms such as cosmic galactic and cosmic radiation. A considerable part of the radiation is reflected from the ozone layer, glaciers.

This part is negligible compared to what originally came from the Sun. What happens on earth is an uneven flow.

First of all, ultraviolet radiation is electromagnetic radiation; therefore, its rays have different wavelengths ranging from 100 to 400 nm.

• the shortest rays are called extreme ultraviolet (100-120 nm), which has the abbreviation EUV / XUV;
• far range - short-wave ultraviolet (120-285 nm) or UVC;• medium range - medium wave ultraviolet (285-315 nm) or UVB;
• near range - long-wave ultraviolet (315-400 nm) or UVA.

Bactericidal ultraviolet radiation (UV-C) deactivates the DNA of bacteria, viruses and other pathogenic microorganisms, destroying their ability to multiply and cause disease. In particular, ultraviolet radiation damages the nucleic acid of microorganisms by the formation of covalent bonds between some adjacent DNA bases. The formation of such bonds does not allow unarchiving DNA for replication, and the "organism" cannot multiply. In fact, when the "organism" tries to multiply, it dies.

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