JOSH%YKTVMH.BITNET@WISCVM.ARPA (07/25/85)
From: Josh Knight <JOSH%YKTVMH.BITNET@WISCVM.ARPA> I don't remember right now, but I think the "noise" from sources other than Extra Terrestrial power grids is large. Also, I don't think that the radiation from power grids gets out..sort of rattles around inside the ionosphere. There are VLF (very low frequency) and ELF (extremely LF) and ULF (ultra LF... EULF??) pulsations that propagate in the magnetosphere, but I think that the radiation apparent from the earth in the range from a few Hz to a few tens of Hz is more likely to be characteristic of processes in magnetosphere, radiation belts and solar wind than the power grid. I seem to remember that the power grid stuff has magnetospheric effects that can be detected but I don't know the singal to noise or if the detections were well accepted experimental results or isolated observations. Adj. Prof. Sidney Self at Stanford U. is/used to be an expert on such things. Of course, any opinions, expressed or implied are mine and not my employers... Josh Knight IBM T.J. Watson Research Center josh@yktvmh.BITNET, josh.yktvmh.ibm-sj@csnet-relay.ARPA