While searching the internet for articles on the ionosphere which may account for the changes in Hum level I came upon the phenomena of convection electrojets which are formed in the ionosphere and apparently gives rise to a dawn and dusk effect. This looks most promising and requires further investigation
On Thursday, May 22, 2014 9:07:05 AM UTC+1, John Dawes wrote: > > Over the past months I have made numerous measurements of the Hum energy > level attempting to establish a link between the measured energy level and > the perceived Hum intensity but the results were not conclusive. I have > therefore returned to some earlier observations which involve the form of > the Hum energy rather than the quantity. > > I had noticed before that when the Hum energy waves were smooth and > regular the perceived Hum could still be heard but it was not so disturbing > and irritating as when the energy wave form was broken and erratic. > > > > Making these measurements I found that the erratic nature of the waves > becomes enhanced for two short but specific times, just after sunrise and > just before sunset, which is when the suns rays traverse the maximum amount > of atmosphere. > > > > From this I conclude that the variations of the perceived Hum level are > controlled mainly by the variations in the stability of the ionosphere. > > > > I have attached two charts of the Hum energy levels at times when the > perceived Hum was high and low > -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/hum-sufferers. For more options, visit https://groups.google.com/d/optout.
