Is there any safety concern with the ELF signals generated using HAARP?
No. These signals are more than eleven million times weaker (smaller) than the Earth’s background field and about one million times weaker (smaller) than the level where researchers have reported biological effects in the literature. Signals generated through ionospheric interaction are so weak, in fact, that sophisticated instruments must be used to observe them. Nevertheless, they are still valuable for scientific purposes and for communication applications.
