Magnetic Field
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Over the past few years, a number of publications have emerged from scientists and researchers all over the world regarding the human magnetic field. Not only have they been studying the human magnetic field, they've also been studying the magnetic field of the planet, and how all these fields, including our own, can impact ourselves and the people around us. It's similar to quantum entanglement, in that both show that everybody and every living thing is "connected" in ways we have yet to fully understand.

Leading the charge are the brilliant scientists over at the HearthMath Institute. An internationally recognized nonprofit research and education organization, it dedicates itself to helping people reduce stress, self-regulate emotions, and build energy and resilience for healthy, happy lives.

A large portion of their research has investigated heart and brain interaction. Researchers have examined how the heart and brain communicate with each other and how that affects our consciousness and the way in which we perceive our world. For example, when a person is feeling really positive emotions like gratitude, love, or appreciation, the heart beats out a certain message. Because the heart beats out the largest electromagnetic field produced in the body, it can yield significant data for researchers. You can read more about that here.

Now, the Institute has published new research which suggests that daily autonomic nervous system activity not only responds to changes in solar and geomagnetic activity, but also synchronizes with the time-varying magnetic fields associated with geomatic field-line resonances and Schumann resonances.

In 1952, German physicist and professor W.O. Schumann of the Technical University of Munich began attempting to answer whether or not the Earth itself has a frequency - a pulse. His assumption about the existence of this frequency came from his understanding that when a sphere exists inside of another sphere, an electrical tension is created. Since the negatively charged Earth exists inside the positively charged ionosphere, there must be tension between the two, giving the Earth a specific frequency. Following his assumptions, through a series of calculations he was able to land upon a frequency he believed was the pulse of the Earth. This frequency was 10hz.

Schumann Spectrum
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It wasn't until 1954 that Schumann teamed up with another scientist, Herbert König, and confirmed that the resonance of the Earth maintained a frequency of 7.83 Hz. This discovery was later tested out by several scientists and confirmed. Since then, the Schumann Resonance has been the accepted term to describe or measure the pulse or heartbeat of the earth.

You can read more about Schumann Resonance here.

"To follow up and confirm these profound findings, an international study with 104 participants in five countries was conducted. The preliminary findings have confirmed and extended the results of the first study and they indicate humanity's heart rhythms are synchronized on a global scale. We are synchronized not only with each other, but also with the earth's energetic systems." (source)

The study was published in the International Journal of Environmental Research and Public Health, and its results are consistent with other studies showing that changes in solar and geomagnetic activity correlate with changes in the human nervous system activity.

It's long been known that all biological systems on Earth are exposed to invisible magnetic fields of all kinds, and at all range of frequencies, and that these fields can affect every cell and circuit to a greater or lesser degree. A number of physiological rhythms, as the study points out, have been shown to be synchronized with solar and geomagnetic activity. (source)(source)(source)(source)(source)(source)

As the study points out:
Human regulatory systems are designed to adapt to daily and seasonal climatic and geomagnetic variations; however, sharp changes in solar and geomagnetic activity and geomagnetic storms can stress these regulatory systems, resulting in alterations in melatonin/serotonin balance, blood pressure, immune system, reproductive, cardiac, and neurological processes. Disturbed geomagnetic activity is associated with the intensification of existing diseases, significant increases in myocardial infarction incidence and death, changes in blood flow, aggregation, and coagulation, increased blood pressure, cardiac arrhythmias, and seizures in epileptics.
Fascinating, isn't it? it makes one wonder just how much we know about our health and what influences it.

The study outlines how, during periods of increased solar activity, which peaks every 10.5 to 11 years, "the sun emits increased ultraviolet (UV) energy and solar radio flub, which is measured by the 2.8 GHz signal" and "although the details of the physiological mechanisms in humans and animals are not yet fully understood, it is apparent that solar and magnetic influences affect a wide range of human health and behavioral processes, with the cardiovascular and nervous systems being the most clearly affected."

The study goes on to outline several examples where the human autonomic nervous system seems to be responding to this type of activity.

For this specific study, ten healthy individuals from the ages of 34 to 65 years old participated, with an average age of 53. Their Heart Rate Variability (HRV) was recorded for 31 consecutive days. To see the methods and results, as well as the statistical analysis, limitations, and more, please refer to the actual study.

Based on their results, the authors concluded:
Overall, the study suggests that daily autonomic nervous system activity not only responds to changes in solar and geomagnetic activity, but is synchronized with the time-varying magnetic fields associated with geomagnetic field-line resonances and Schumann resonances. A likely explanation for how solar and geomagnetic fields can influence human nervous system activity is through a resonant coupling between our nervous systems and geomagnetic frequencies (Alfvén waves), or ultra low frequency standing waves in the earth-ionosphere resonant cavity (Schumann resonances) that overlap with physiological rhythms.
Findings like these, and many more, are exactly why the HeartMath institute began what's known as the Global Coherence Initiative (GCI).

Others are working on identifying how these fields can be sensed.

A recent study published by Kirschvink in the journal Nature Communications suggests that a protein in the human retina, when placed into fruit flies, has the ability to detect magnetic fields. The research claims that it can serve as a magneto sensor, but it's unknown whether or not humans use it in this way as well. (source)