The variations in Hum level appear to be completely random, no obvious pattern has emerged except there is a consistent fall in level from around 4 am until 9 am and this is particularly prominent on a Monday morning. There are two main factors involved in the generation of the Hum, the voltage of the power grid and the electron density of the ionosphere. Both of these have a daily cycle which oppose each other, the voltage on the grid reaches a maximum around midnight, and the electron density reaching a maximum around noon. It is unfortunate that so far these daily cycles in the grid voltage and electron density have not been revealed in Hum level measurements. In the past it is most often assumed that the Hum is a local effect but as both the surface of the Earth and the ionosphere, with a height of 250 miles, is involved in the equation this notion of local must be abandoned. It is possible that some of the energy effecting Hum sufferers in the UK originates from areas of high electrical intensity in Europe. One further complication to be considered is that the UK grid maximum is shifted by one hour due to the use of British Summer Time. There is little doubt that the use of massive amounts of electrical power has completely swamped the Earth's own very delicate electrical system and we are paying the price for greed and arrogance.
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