Originally posted by: Zuiko
You have a statement:
Conductivity at sunrise and sunset increases.
The sunrise and sunset effects have reproducible rippled form for both positive and negative conductivities. First it increases to first peak then it deceases, then it increases in a small central hump, then it decreases slightly again and finally increases to a final large peak before coming back to the normal trace.
If you are interested in the phenomena, and have access to the paywalled scientific literature that the public has paid for, then you can search for more modern texts than my 1991 dissertation linked to above in the second post.
an instant search of google scholar throws up hundreds of results.
Quite a lot if the results on google scholar are prior to my 1991 dissertation. Most of these earlier measurements are not time series measurements recorded every minute and a half or so, and are not a good guide to the phenomena.
Someone may indeed have solved this problem and the results paywalled somewhere. My original statement was made to peak the curiosity of younger students reading this forum, rather than to enforce a particular way of looking at the problem (and how it relates to other phenomena) upon them.
You know at least one fact:
The change in energy provided by the sun [at a particular location on the earth] at this time [sunrise and sunset] is maximum.
That is not a fact, it is either a conjecture or a supposition.
As either a conjecture or supposition it is patently wrong. Ignoring the effects of clouds during the day the maximum change in the energy provided by the sun arriving at a particular location comes at the time of solar eclipse.
There are effects on atmospheric electricity at the time of eclipses and these effects can be compared with sunrise and sunset effects. Whether or not this has been done using high frequency time series measurement post 1991 I don't know.