On 09/24/2011 08:14 PM, Pace VanDevender wrote:
That particular trace was at 24KHz--looking at the NAA station in Cutler, Maine. Here is the data for NML, at 25.2Khz, located in LaMour, North Dakota:  You can see that the response is absorptive, rather than reflective, and less intense, along this very-much-longer path between my receiver and the transmitter in North Dakota. In particular, the M7 at 15:20 UTC isn't even visible in this data, because the Sun angle at the transmitter site was probably "all wrong" to get a strong response at that time of day. I monitor several different frequencies, and submit data to the Stanford SID data center every day. With my 96KHz sound card, and loop antenna, I can "see" from a few hundred Hz to around 45KHz or so. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org |
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