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Author Topic: Magnetic north is on the move again  (Read 2363 times)
clivejo
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« on: January 20, 2014, 01:30:59 PM »

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The magnetic variation throughout Great Britain has been a few degrees West of grid North with the amount of variation changing every year. For years the number has decreased, and now in the far South West of Britain, the North on your compass lies to the East of the North on your map for the first time since before the Ordnance Survey came into existence (in 1791 if youíre interested).

More at http://www.ordnancesurvey.co.uk/blog/2014/01/magnetic-north-is-on-the-move-again/
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clockmanFR
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« Reply #1 on: January 20, 2014, 07:51:57 PM »

Talk about dumbing down.  freeze

Ordnance Survey used to say, (in the old days) eg, Magnetic Deviation 05 degree's 01 minutes 06 seconds West, (1990) gaining 00 minutes 09 seconds annually East.

But then nowadays who the heck uses a Map, ooppps Me!  facepalm
« Last Edit: January 20, 2014, 08:28:03 PM by clockmanFR » Logged

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oliver90owner
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« Reply #2 on: January 20, 2014, 11:37:06 PM »

It's all perfectly normal.

The Earth's magnetic field changes polarity about every 200k years and it is about due anytime.  Of course, they are not sure on the timescale of the 'flip' - when or how long it takes, but it is extremely likely to happen  in the next fifty thousand years, and quite probably in the next 20k years.  That will certainly rugger up map reading by compass!

Check out sea floor spreading and rock magnetic polarity.  Quite a modern discovery, really.

RAB
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rogermunns
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« Reply #3 on: September 13, 2014, 08:27:53 AM »

So what are the ramifications - trivial or serious to living creatures - if such a change took, so, a day and it happened tomorrow, without warning?
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oliver90owner
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« Reply #4 on: September 13, 2014, 09:11:26 AM »

Swallows (and other migratory birds) flying in the wrong direction?

Some insects might be confused and get lost (honey bees for example?)

Of course, these animals would soon get over the problem as they likely use other physical means for direction-finding.

As for humans?  Air traffic would be in a mess if it wasn't foreseen!  Anyone navigating (by compass only) would likely go round in a semicircle and finish up approx where they started!

Likely the CERN LHC would have to be re-jigged?

Northern lights would relocate.

Doubtless a lot of others, too.

All current stored information containing any magnetic directional data would be either wrong or need updating.
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clivejo
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« Reply #5 on: September 13, 2014, 02:51:33 PM »

So what are the ramifications - trivial or serious to living creatures - if such a change took, so, a day and it happened tomorrow, without warning?

That's the problem, there are no records from the last time it flipped  hysteria

Even a stronger solar wind than normal can affect modern day technology, so we are definitely vulnerable.
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desperate
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« Reply #6 on: September 13, 2014, 05:43:14 PM »

It could  allow lots of nasty highly energetic particles to penetrate down to the surface.

Desp
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martin
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« Reply #7 on: September 13, 2014, 07:28:50 PM »

They're here, spotted passing through a local town, some blasted bicycle race......... Grin
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dhaslam
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« Reply #8 on: September 14, 2014, 02:01:27 PM »

It seems that the  earths magnetic field is  weakening and would  weaken  much more  during  a polarity reversal.  This would seriously affect UV penetration of the atmosphere.   The inventor  of CFCs, Thomas Midgley,   will have even more to  answer for.   Amazingly   he eventually killed himself  with one of his inventions having recovered from lead poisoning earlier.

http://en.wikipedia.org/wiki/Thomas_Midgley,_Jr.
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