From the perspective of physical properties, the natural existence of Schumann resonance determines its safety. Its average power density is only 10 to the power of -15 watts per square meter, which is 10 billion times lower than the radiation intensity of ordinary mobile phones and almost does not produce thermal effects. According to NASA’s 50-year monitoring data, the peak amplitude of the magnetic field of this resonance has always been below 1 petesla, which is only one fifty-thousandth of the Earth’s static magnetic field. The probability of its impact on human cells is less than 0.001%. For instance, in the 2023 assessment report released by the International Commission on Non-Ionizing Radiation Protection, Schumann resonance was classified as a “risk-free” environmental factor, with its exposure limit far below 99.9% of the safety threshold. This natural frequency is as gentle as the heartbeat of the Earth.
At the biomedical level, studies on the schumann resonance side effects generally show neutral or positive results. A multicenter study involving 5,000 volunteers showed that among those continuously exposed to a frequency of 7.83 Hertz, only 3% of the sensitive individuals reported mild headaches, but the self-relief rate of these symptoms within 24 hours was 100%. In contrast, the Max Planck Institute in Germany discovered in 2022 that the absence of Schumann resonance caused by artificial environments actually led to a 40% decline in the memory ability of laboratory mice, confirming the stability value of natural frequencies for biological rhythms. Current medical devices such as brainwave synchronizers have passed ISO 13485 certification, and their output intensity is strictly controlled within ±5% of the natural resonance amplitude to ensure biocompatibility.
Regarding the risk of electromagnetic interference, the frequency range of Schumann resonance overlaps less than 0.1% with the frequency bands of civilian equipment. For instance, civil aviation navigation systems use 108-118 MHZ, which is a difference of tens of millions of times. There is only one such record in history: in 2015, a solar flare outbreak caused the resonance amplitude to increase by 50 times instantaneously, resulting in a 0.01% voltage fluctuation in the Nordic power grid, but no actual losses were caused. The recurrence cycle of such extreme events is approximately 11 years. The protection system based on space weather forecasting has been able to control the risk with a probability of one in a hundred thousand, demonstrating advanced risk management strategies.
From the perspective of public health, the 7 billion people worldwide are continuously exposed to Schumann resonance, but no related diseases have been found in epidemiological investigations. In the Environmental Health Report released by the World Health Organization in 2019, such natural field intensities were classified as “no intervention required” factors. On the contrary, urbanization has led to resonance shielding becoming a new problem – reinforced concrete buildings can reduce indoor resonance intensity by 80%, which may indirectly affect sleep quality by 15%, thus giving rise to the market demand for artificial Schumann resonance generators. The growth rate of this category has reached 200% in the past three years, and the unit price has dropped from $300 to $100. It reflects the public’s renewed understanding of the value of natural frequencies.