People have interest in measuring EMFs (Electro Magnetic Fields) for varying reasons. I will be using the EMF meter received today not only to be more aware of electronic radiation in my living environment and to demonstrate to electronics users the health threat of exposure, but also to experiment with measuring natural EMF anomalies.
There are many different kinds of waves. Sound relates to pressure waves, only audible to us between 20 Hz (bass) and 20 thousand Hz (treble). Light relates to electromagnetic waves, only visible to us between 430 trillion Hz (red) and 750 trillion Hz (violet). There is no relationship between sound and light waves: noise colors are just a handy analogy, nothing more....
For the human auditory system, white noise sounds much brighter than what one would expect from a "flat" spectrum. This is because human hearing senses frequencies on a logarithmic scale (the octaves) rather than a linear scale. - White Noise
A Google key word search does not an expert make, but it can pique one's sense of wonder and add to one's knowledge base, which can grow into wisdom and understanding. For example, I quickly learned:
EMFs are measured in milliGauss (mG). The Environmental Protection Agency recommends that you limit your exposure to 0.5 mG to 2.5 mG. When you are three feet away from a microwave, you are exposed to up to 25 mG.
Electric fields exist whenever charge is present.... Magnetic fields arise from current flow. Their flux densities are measured in microtesla (µT) or millitesla (mT). At radio and microwave frequencies, electric and magnetic fields are considered together as the two components of an electromagnetic wave.
How this information is practically useful, is apparent as it enables me to use the EMF meter more competently. When conceptualizing the subtle, perhaps it helps my imaginings be more grounded in actuality, at least from a limited human perspective. Whether the imaginings are for my mental pleasure or not, I still like to find practical application in daily life and provide proof using scientific methods.
Here's what I found in two diverse articles, from the World Health Organization (what are EMFs) and Conscious Lifestyle Magazine (human energy fields):
WORLD HEALTH ORGANIZATION
What are electromagnetic fields?
Definitions and sources
Electric fields are created by differences in voltage: the higher the voltage, the stronger will be the resultant field. Magnetic fields are created when electric current flows: the greater the current, the stronger the magnetic field. An electric field will exist even when there is no current flowing. If current does flow, the strength of the magnetic field will vary with power consumption but the electric field strength will be constant.
(Extract from Electromagnetic fields published by the WHO Regional Office for Europe in 1999 (Local authorities, health and environment briefing pamphlet series; 32).
Natural sources of electromagnetic fields
Electromagnetic fields are present everywhere in our environment but are invisible to the human eye. Electric fields are produced by the local build-up of electric charges in the atmosphere associated with thunderstorms. The earth's magnetic field causes a compass needle to orient in a North-South direction and is used by birds and fish for navigation.
Human-made sources of electromagnetic fields
Besides natural sources the electromagnetic spectrum also includes fields generated by human-made sources: X-rays are employed to diagnose a broken limb after a sport accident. The electricity that comes out of every power socket has associated low frequency electromagnetic fields. And various kinds of higher frequency radiowaves are used to transmit information – whether via TV antennas, radio stations or mobile phone base stations.
The basics of wavelength and frequency
What makes the various forms of electromagnetic fields so different?
One of the main characteristics which defines an electromagnetic field (EMF) is its frequency or its corresponding wavelength. Fields of different frequencies interact with the body in different ways. One can imagine electromagnetic waves as series of very regular waves that travel at an enormous speed, the speed of light. The frequency simply describes the number of oscillations or cycles per second, while the term wavelength describes the distance between one wave and the next. Hence wavelength and frequency are inseparably intertwined: the higher the frequency the shorter the wavelength.
A simple analogy should help to illustrate the concept: Tie a long rope to a door handle and keep hold of the free end. Moving it up and then down slowly will generate a single big wave; more rapid motion will generate a whole series of small waves. The length of the rope remains constant, therefore, the more waves you generate (higher frequency) the smaller will be the distance between them (shorter wavelength).
What is the difference between non-ionizing electromagnetic fields and ionising radiation?
Wavelength and frequency determine another important characteristic of electromagnetic fields: Electromagnetic waves are carried by particles called quanta. Quanta of higher frequency (shorter wavelength) waves carry more energy than lower frequency (longer wavelength) fields. Some electromagnetic waves carry so much energy per quantum that they have the ability to break bonds between molecules. In the electromagnetic spectrum, gamma rays given off by radioactive materials, cosmic rays and X-rays carry this property and are called 'ionizing radiation'. Fields whose quanta are insufficient to break molecular bonds are called 'non-ionizing radiation'. Man-made sources of electromagnetic fields that form a major part of industrialized life - electricity, microwaves and radiofrequency fields – are found at the relatively long wavelength and low frequency end of the electromagnetic spectrum and their quanta are unable to break chemical bonds.
Electromagnetic fields at low frequencies
Electric fields exist whenever a positive or negative electrical charge is present. They exert forces on other charges within the field. The strength of the electric field is measured in volts per metre (V/m). Any electrical wire that is charged will produce an associated electric field. This field exists even when there is no current flowing. The higher the voltage, the stronger the electric field at a given distance from the wire.
Electric fields are strongest close to a charge or charged conductor, and their strength rapidly diminishes with distance from it. Conductors such as metal shield them very effectively. Other materials, such as building materials and trees, provide some shielding capability. Therefore, the electric fields from power lines outside the house are reduced by walls, buildings, and trees. When power lines are buried in the ground, the electric fields at the surface are hardly detectable.
Magnetic fields arise from the motion of electric charges. The strength of the magnetic field is measured in amperes per meter (A/m); more commonly in electromagnetic field research, scientists specify a related quantity, the flux density (in microtesla, µT) instead. In contrast to electric fields, a magnetic field is only produced once a device is switched on and current flows. The higher the current, the greater the strength of the magnetic field.
Like electric fields, magnetic fields are strongest close to their origin and rapidly decrease at greater distances from the source. Magnetic fields are not blocked by common materials such as the walls of buildings....
Electric fields arise from voltage.
Their strength is measured in Volts per metre (V/m)
An electric field can be present even when a device is switched off.
Field strength decreases with distance from the source.
Most building materials shield electric fields to some extent.
Magnetic fields arise from current flows.
Their strength is measured in amperes per meter (A/m). Commonly, EMF investigators use a related measure, flux density (in microtesla (µT) or millitesla (mT) instead.
Magnetic fields exist as soon as a device is switched on and current flows.
Field strength decreases with distance from the source.
Magnetic fields are not attenuated by most materials.
Plugging a wire into an outlet creates electric fields in the air surrounding the appliance. The higher the voltage the stronger the field produced. Since the voltage can exist even when no current is flowing, the appliance does not have to be turned on for an electric field to exist in the room surrounding it.
Magnetic fields are created only when the electric current flows. Magnetic fields and electric fields then exist together in the room environment. The greater the current the stronger the magnetic field. High voltages are used for the transmission and distribution of electricity whereas relatively low voltages are used in the home. The voltages used by power transmission equipment vary little from day to day, currents through a transmission line vary with power consumption.
Electric fields around the wire to an appliance only cease to exist when the appliance is unplugged or switched off at the wall. They will still exist around the cable behind the wall.
How do static fields differ from time-varying fields?
A static field does not vary over time. A direct current (DC) is an electric current flowing in one direction only. In any battery-powered appliance the current flows from the battery to the appliance and then back to the battery. It will create a static magnetic field. The earth's magnetic field is also a static field. So is the magnetic field around a bar magnet which can be visualized by observing the pattern that is formed when iron filings are sprinkled around it.
In contrast, time-varying electromagnetic fields are produced by alternating currents (AC). Alternating currents reverse their direction at regular intervals. In most European countries electricity changes direction with a frequency of 50 cycles per second or 50 Hertz. Equally, the associated electromagnetic field changes its orientation 50 times every second. North American electricity has a frequency of 60 Hertz.
What are the main sources of low, intermediate and high frequency fields?
The time-varying electromagnetic fields produced by electrical appliances are an example of extremely low frequency (ELF) fields. ELF fields generally have frequencies up to 300 Hz. Other technologies produce intermediate frequency (IF) fields with frequencies from 300 Hz to 10 MHz and radiofrequency (RF) fields with frequencies of 10 MHz to 300 GHz. The effects of electromagnetic fields on the human body depend not only on their field level but on their frequency and energy. Our electricity power supply and all appliances using electricity are the main sources of ELF fields; computer screens, anti-theft devices and security systems are the main sources of IF fields; and radio, television, radar and cellular telephone antennas, and microwave ovens are the main sources of RF fields. These fields induce currents within the human body, which if sufficient can produce a range of effects such as heating and electrical shock, depending on their amplitude and frequency range. (However, to produce such effects, the fields outside the body would have to be very strong, far stronger than present in normal environments.)
Electromagnetic fields at high frequencies
Mobile telephones, television and radio transmitters and radar produce RF fields. These fields are used to transmit information over long distances and form the basis of telecommunications as well as radio and television broadcasting all over the world. Microwaves are RF fields at high frequencies in the GHz range. In microwaves ovens, we use them to quickly heat food.
At radio frequencies, electric and magnetic fields are closely interrelated and we typically measure their levels as power densities in watts per square metre (W/m2).
Conscious Lifestyle Magazine
'....Then in the 1930s, Dr. Lawrence Bendit and Phoebe Bendit observed the human energy field and linked it to soul development, showing that the subtle forces are the foundation of health. Their observations are mirrored and expanded by those of Dr. Dora Kunz, a theosophist and intuitive, who saw that every organ has its own field—as does the overall subtle body—which pulses with its own rhythm when healthy. When someone is ill, these rhythms alter, and problems can be intuitively seen in the field.
'When Dr. Zheng Rongliang of Lanzhou University in China measured the flow of chi from a human body with a unique biological detector, he showed that not only does the aura pulse, but that not everyone’s human energy field pulses at the same rate or intensity. This study was repeated by researchers at the Shanghai Atomic Nuclear Institute of Academia Sinica.
'Soviet scientists from the Bioinformation Institute, headed by A. S. Popow, actually measured the human energy field, or more specifically, the biocurrents manifested in the surrounding energy body. They discovered that living organisms emanate vibrations at a frequency between 300 and 2,000 nanometers. They called this field the “biofield” and discovered that people with a strong and widespread biofield can transfer energy more successfully. This research was later confirmed by the Medical Science Academy in Moscow.
'A special form of photography is actually able to take pictures of the auric field. In the 1930s, Russian scientist Semyon Kirlian and his wife, Valentina, invented a new photographic process that involves directing a high-frequency electrical field at an object. The object’s pattern of luminescence—the auric human energy field—can then be captured on film. Contemporary practitioners are using Kirlian photography to show how the aura responds to different emotional and mental states, and even to diagnose illness and other problems. Medical science is now using a heat aura, as well as other imaging processes, to show the different aspects of the body’s electromagnetics.
'One of the more compelling sets of studies in this area was conducted by Dr. Valerie Hunt. In A Study of Structural Neuromuscular, Energy Field, and Emotional Approaches, she recorded the frequency of low-millivoltage signals emanating from the body during Rolfing sessions. She made these recordings using electrodes of silver and silver chloride on the skin. Scientists then analyzed the wave patterns recorded with a Fourier analysis and a sonogram frequency analysis. The human energy field did, indeed, consist of a number of different color bands, which correlated to the chakras. The following results, taken from the February 1988 study, showed color-frequency correlations in hertz or cycles per second:
+ Blue 250–275 Hz plus 1,200 Hz
+ Green 250–475 Hz
+ Yellow 500–700 Hz
+ Orange 950–1050 Hz
+ Red 1,000–1,200 Hz
+ Violet 1,000–2,000, plus 300–400; 600–800 Hz
+ White 1,100–2,000 Hz
'While mechanically measuring the subjects, healer and aura reader Reverend Rosalyn Bruyere provided her own input, separately recording the various colors she intuitively perceived. In all cases, her renderings were the same as those demonstrated mechanically. Hunt repeated this experiment with other psychics with the same results.
But What Is The Auric Field?
'We know it exists—but what is the auric field? Scientists including James Oschman, author of Energy Medicine, consider it a biomagnetic field that surrounds the body. As Dr. Oschman says, “It is a fact of physics that energy fields are unbounded.” This means that our biomagnetic human energy fields extend indefinitely.
'Modern equipment can now measure the heart’s fields—the strongest of those originating from an organ—up to fifteen feet away. As for the aura’s job, science has determined that this magnetic field conveys information about events taking place inside the body, rather than on the skin. Its purpose is therefore vitally linked to our internal health.' - Energetic Anatomy: A Complete Guide to the Human Energy Fields and Etheric Bodies by Cyndi Dale - Conscious Lifestyle Magazine
The Whole Human site is non-commercial. There are no ads, no donation requests, no links which are paid back to me. There is 'nothing wrong' with those things. For me, for the Whole Human site, non-commercialization just feels cleaner. My review on Amazon of the meter I started using today, is here, in case you have interest.