Samed, cease down in the division the International Telecommunication Union to the radiation of electromagnetic with a frequency between 3 to 30 be said that the length of a wave between 100,000 to 10,000 kilometers. Frequency cease with your words, the abbreviation ELF.

in the atmospheric sciences., the frequency of cease down in increments of 3 up to 3000 considered.

these waves between the ionosphere and the surface of the earth to naturally exist. Waves with a frequency of cease down in the communication, telecom, military as well as electromagnetic therapy, are used.

from the effects of exposure to these waves on the health of living creatures, and also reports there.