Magnetic change?
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Originally Posted by testpanel
(Post 10358345)
What to expect?
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Someone will figure out a way to tax it... |
Polarity switch on its way? Not due...but..
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If there is a polarity shift, does it become West Anglia? |
Originally Posted by Herod
(Post 10358492)
Polarity switch on its way? Not due...but..
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Some runways will need to be renumbered but VORs will not change and will be confusing.
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This reminds me of a route we flew years ago, overflying Sudan, east/west.. Somewhere between 100 and 200nm west of Khartoum, the standby compass (float type) would give a pronounced dip, in the direction expected, for a duration of about 5mins. IIRC.
All sorts of theories of course amongst the crew(s). but nothing convincing for me, except it had to have been external influence. |
Originally Posted by The Ancient Geek
(Post 10358553)
Some runways will need to be renumbered but VORs will not change and will be confusing.
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The orientation of VOR antennas is fixed at the time of installation and cannot be changed so the radials refer to the magnetic north which existed when installed.
Note that this refers to the LOCAL magnetic field which may or may not be significantly changed by the magnetic pole wandering as described in the article. |
Originally Posted by The Ancient Geek
(Post 10358567)
The orientation of VOR antennas is fixed at the time of installation and cannot be changed so the radials refer to the magnetic north which existed when installed.
Note that this refers to the LOCAL magnetic field which may or may not be significantly changed by the magnetic pole wandering as described in the article. https://cimg9.ibsrv.net/gimg/pprune....41f251672e.jpg |
Scientists are not just talking about an increasing Variation Drift. Talk is of a sudden 180 deg shift. It has happened in the past. |
Why don't we switch to true north navigation, just publish all as true, zero all variation databases in the IRS an be done with it!
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Originally Posted by KiloB
(Post 10358594)
Scientists are not just talking about an increasing Variation Drift. Talk is of a sudden 180 deg shift. It has happened in the past. |
Originally Posted by Capt Fathom
(Post 10358607)
It has? When?
I don't think that one caused any problem for pilots. :O Brunhes–Matuyama reversal |
Short term - change in compass declination, repainting work etc
medium term - gradual decline in field strength and more variability long term - flip - but that may take 500 years - nothing to much to worry about - its happened lots of times since Homo sap. started |
The orientation of VOR antennas is fixed at the time of installation and cannot be changed so the radials refer to the magnetic north which existed when installed. Note that this refers to the LOCAL magnetic field which may or may not be significantly changed by the magnetic pole wandering as described in the article. |
North and South is a Geographical term, referring to the two poles of the earth's rotational axis. In layman's terms, the North is to the left when facing in the direction of the Earth's rotation, and South is to the right. The magnetic poles have simply been named in their relation to the geographical poles. Should the polarity reverse all that needs to be changed is the naming convention, from that moment onwards the former magnetic South becomes North and vica versa, and everything is back to normal.
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A pole reversal, or a N/S polarity change, takes a few centuries to stabilize. That is pretty confusing I reckon. |
Avionics-wise we should be able to switch to true north by now but wasn't there something about the magnetic field weakening in conjunction with a flip, thus removing the protection against space radiation for some time....
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