The reason is that darknessâor, to put it the other way, the absence of lightâstimulates the production of a hormone, melatonin, from its immediate precursor, the neurotransmitter serotonin. Like serotonin, melatonin plays important roles in our physical and mental well-being.
The five major ocean gyres. A gyre in oceanography is any large system of circulating ocean currents, particularly those involved with large wind movements. Gyres are caused by the Coriolis effect; planetary vorticity along with horizontal and vertical friction, determine the circulation patterns from the wind curl (torque).
Schumann resonances occur because the space between the surface of the earth and the conductive ionosphere acts as a closed waveguide. This waveguide acts as a resonant cavity for electromagnetic waves. Schumann resonances appear as distinct peaks at extremely low frequencies starting around 7.8 hertz, which is considered the fundamental frequency. Schumann resonances in Earth-ionosphere cavity. Courtesy NASA. Resonances can be observed at around 7.8, 14, 20, 26, 33, 39 and 45 hertz, with a daily variation of about Â± 0.5 hertz, which is caused by the daily increase and decrease in the ionization of the ionosphere due to UV radiation from the sun (also see the live data).