The Earth’s Magnetic Field
The cause of the Earth’s magnetic field can be explained by the dynamo theory. The liquid outer core, comprised largely of molten iron, moves through the electromagnetic field of the Sun, and this generates electric currents in the outer core. These current, in turn, generate another magnetic field. The Earth’s magnetic fields extend infinitely, though they are weaker further from their source.
The strength of the field at the Earth’s surface ranges from less than 30 microTeslas (μT ) in an area including most of South America and South Africa to over 60 μT in regions near the magnetic north and south poles in northern Canada, Siberia, and parts of southern Australia.
Electric currents induced in the ionosophere also generate magnetic fields. These fields are always generated near where the atmosphere is closest to the Sun, causing daily alterations which can deflect surface magnetic fields by as much as one degree. Typical daily variations of field strength are about 25 nanoteslas (nT), with variations over a few seconds of typically around 1 nT. Furthermore, many hundreds of lightning strikes occurring globally in the ionosphere each minute of the day generate magnetic fields.
From a global perspective the Earth is covered by a permanent lightning storm. The electromagnetic impulse from a flash of lightning in the tropics is transferred around the Earth’s circumference at the speed of light, creating electromagnetic resonance. At the beginning of the 1950’s the physicist Winfried Otto Schumann discovered that the space between the Earth’s surface and the conductive atmosphere (ionosphere) functioned as a waveguide (or spherical capacitor). (Schumann 1954b/23) This is because the ionosphere is capable of trapping electromagnetic waves. The many hundreds of lightning strikes that occur globally in this cavity create electromagnetic resonances with a fundamental frequency of 7.83 Hz. According to König this resonance frequency of the Earth is extremely stable. A recent study proved once again that the human body absorbs, detects and responds to extremely low frequency environmental electromagnetic signals in the Schumann resonance frequency range.
Further resonance modes occur at 6.5 Hz intervals due to the Earth’s spherical geometry. These resonance modes (overtones) are detected in the background radio noise of the Earth’s energetic field as separate peaks around 14.3, 20.8, 27.3 and 33.8 Hz. Furthermore, these overtones seem to be essential for our bodies.
If our bodies are blocked from natural exposure to these natural waves (e.g., due to living and working in buildings constructed with concrete, steel and metal alloys, driving in cars on paved roads, and by the electro-pollution of ultra-high frequency radiations from cell phones, microwave ovens, wireless phone and computer networks, and radar/satellite signals, etc.) we are more susceptible to illness, loss of cell membrane integrity, compromised immunity, and depression. Recorded dips in the Earth’s Schumann resonances have had strong correlation to heart attacks, car accidents, and a general increase in the death rate.
In 1950 Winfried Otto Schumann discovered that space to between the Earth’s surface and the conductive atmosphere, known as the “ionosphere,” functions as a waveguide (or a spherical capacitor). The ionosphere is capable of trapping electromagnetic waves. The many hundreds of lightning strikes that occur globally in this cavity create electromagnetic resonances with a fundamental frequency of 7.83 Hz.
The Schumann resonances (SR) are a set of spectrum peaks in the extremely low frequency ( ELF) portion of the Earth’s electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, excited by lightning discharges in the cavity formed by the Earth surface and the ionosphere. This global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonances occur because the space between the surface of the Earth and the conductive ionosphere acts as a closed waveguide. The limited dimensions of the Earth cause this waveguide to act as a resonant cavity for electromagnetic wayves in the ELF band. The cavity is naturally excited by electric currents in lightning. Schumann resonances are the principal background in the electromagnetic spectrum between 3–69 Hz, and appear as distinct peaks at extremely low frequencies (ELF) around 7.83, 14.3, 20.8, 27.3 and 33.8 Hz.
In the normal mode description of Schumann resonances, the fundamental mode is a standing wave in the Earth-ionosphere cavity with a wavelenth equal to the circumference of the Earth. This lowest-frequency (and highest- intensity) mode of the Schumann resonance occurs at a frequency of approximately 7.83 Hz, but this frequency can vary slightly from a variety of factors, such as solar-induced perturbations to the ionosphere, which comprises the upper wall of the closed cavity. The higher resonance modes are spaced at approximately 6.5 Hz intervals, a characteristic attributed to the atmosphere’s spherical geometry. The peaks exhibit a spectral width of approximately 20% on account of the damping of the respective modes in the dissipative cavity. The eighth overtone lies at approximately 59.9 Hz.
The Earth’s magnetic field strength was measured by Carl Friedrich Gauss in 1835 and has been repeatedly measured since then, showing a relative decay of about 10% over the last 150 years.
Animals including birds and turtles can detect the Earth’s magnetic field, and use the field to navigate during migration. Cows align their bodies north-south in response to the magnetic field; this response is confused by the magnetic fields surrounding high voltage power lines.