Please pass to all involved with the HAMSCI Magnetometer project:
Kindly read this gentleman's results from his citizen magnetometer project in AK.
His GitHub site is:
With the first part of his project at:
https://engrinak.github.io/python/2021/01/21/Geomagnetic-Observatory-Part1.html
This gentleman's experience with his magnetometer shows likely pitfalls for a citizen-science magnetometer, to the point that I'm not sure it is worth trying on a mass scale unless the sensor can be designed and engineered in a way to physically isolate and protect it from local thermal, magnetic and electromagnetic effects.
Also, his data comparison to the USGS magnetometer did not show as much "correlation" as I would have hoped, in fact some of his data goes the opposite direction from the calibrated USGS magnetometer data recorded 600 miles away. Can magnetometer data vary that much 600 miles from USGS magnetometer site? (I don't know that much about the sensitivity of magnetometers except in degaussing our ship in the navy, but learned a lot from this gentleman's experiments.)
73, Larry N6NC
Hi Larry,
Thank you for your concerns; we are doing our best to test and mitigate all of those things that you talk about. Jules K2KGJ has already done extensive thermal testing, and has developed and enclosure/mount that allows for temperature stabilization when buried in the ground. Bill AB4EJ has just recently been conducting EM/RFI testing, and results and discussion have been posted just over the past few days on the TangerineSDR Listserv.
Please take a look at the presentations given at the HamSCI workshop this March by Jules Madey K2KGJ and Dave Witten KD0EAG:
Jules’ presentation shows excellent agreement of his Hillsdale, NY PN3100 magnetometer with the professional magnetometer in Fredericksburg, VA.
We are testing at additional locations as well, and will be analyzing the data carefully from all of these stations.
73 Nathaniel W2NAF
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Hi Larry,
I just wanted to clarify one other point… there is not an expectation that the ground magnetometer will be able to make effective geophysical measurements in dense urban and suburban areas. I know that this has been tried many times with professional instruments, and has not turned out well. There may be other applications for the magnetometer in these environments, but the best data is likely going to come from rural locations.
73 Nathaniel
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