EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: RoGeorge on January 05, 2019, 02:58:35 pm
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https://www.youtube.com/watch?v=Of-_BBHYwRE (https://www.youtube.com/watch?v=Of-_BBHYwRE)
^-^
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Didn't watch the video, but anyone who paid attention in a good physics class would know that the field of the earth is 3D, and is only parallel to the earths surface near the equator.
Image using a compass in Newfoundland or in Alaska. Both far north with strong vertical components. And very different results due to the details of earths magnetic field.
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The surprise was that the angle is much bigger than I was expecting, because the magnetic core is much smaller than the whole Earth. Also the tilt distribution is far from being uniform:
(http://i66.tinypic.com/5lowvl.jpg)
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The surprise was that the angle is much bigger than I was expecting, because the magnetic core is much smaller than the whole Earth. Also the tilt distribution is far from being uniform:
It's only a surprise because you formed an expectation without bothering to read the subject. Your post is still pointlessly lacking in any effort at education. I also suggest that you read up on how distortions occur with different types of map projection.
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Well, it seems that magnetic lines tilted downward up to 30 degrees at the Equator is common knowledge for everyone but me. ;D
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Well, it seems that magnetic lines tilted downward up to 30 degrees at the Equator is common knowledge for everyone but me. ;D
Understanding magnetic deviation+variation is basic component to all pilot training and quite evident, especially if you are a bush pilot in Canda's north or Alaska.
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This seems like a perfect opportunity for whoever it is around here, who has is location set to Antarctica, to pitch in a demo. ;D
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Correct me if I'm wrong, but wouldn't there need to be a pretty much equal number of lines exiting the Earth as there is entering the Earth. The magnetic poles are not coincident with the axis of rotation which complicates things a bit and the makeup of the Earth is not consistent with variations in the distribution of iron and other ferromagnetic materials.
Brian
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Fun fact: it's called magnetic inclination or dip: https://en.wikipedia.org/wiki/Magnetic_dip
More than you might want to read about the field: https://en.wikipedia.org/wiki/Earth%27s_magnetic_field
In a book on the Hubble Space Telescope there was a reference to the South Atlantic Anomaly where it's computer would crash & then go into safe mode: https://en.wikipedia.org/wiki/South_Atlantic_Anomaly
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Thank you. Title changed to include the proper term: magnetic dip.
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This seems like a perfect opportunity for whoever it is around here, who has is location set to Antarctica, to pitch in a demo. ;D
:-DD :-DD :-+
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Given the accelerating rate and direction of motion of the magnetic north pole there could be a new thread started:
"The Russians are stealing the North Pole"