What a treat to listen to a very knowledgeable person with excellent communication skills. More of that, mankind.

Who knew that when combining Navier-Stokes and Maxwell's equations things would get complicated.

This was much much more interesting than I thought it would be. Very nice video.

As a Canadian I am not sad about this. We can share the North pole. And for anyone that is asking; yes, Santa is Canadian. His postal code is H0H 0H0.

Brilliant video! Love Dr Gray's enthusiasm!

[9:08]. "a bit wonky". Dr Gray sounded well English. She's been hanging out with us for so long she's picking up an accent 😂. And we're happy to have her 👍

It is a pleasure listening to such an knowledgeable person. Dr. Gray makes the subject approachable for all audiences. Thank you for posting it.

This video is awesome and is surely the start of a magnetic pole rabbit hole for me. If I'm not back in a week send a search party with a map and a -compass- better map.

Those magnetic topographic maps were amazing. I had no idea there was that much variation.

That sound effect on the google earth zooms is definitely the sound of the Imperial Probe Droid on Hoth from The Empire Strikes Back right?

Thank you for making these awesome videos!

Loved it!!! Thanks for your time and effort!

"It's a very complicated field." Scientist really can't help themselves with the puns.

Back in 1964 my science teacher told me that magnetic deviation was caused by large loadstone deposits in Canada. I did watch a documentary recently about magnetic pole reversal and they made it out to be quite alarming. Thank you for this fascinating video.

This answers a whole bunch of answers I had about this subject. Good video!

Everyone on these videos always seems so excited about their individual subjects. That's so inspiring. If i had professors like this when I was in school or college, I might be doing something very different right now, instead of commenting on a youtube video.

Awesome video! I wish you'd asked why the magnetic and geomagnetic poles are different. That seems surprising and non-obvious.

Before GPS when ,as an airline pilot, we had to fly over the very north we had to be very wary of losing Inertial Navigation computation of the offset caused by the variable magnetic offset required to stay on course.

I always enjoy the videos with Dr Gray... As a Canadian, I may be biased in this... But one thing I notice every time is just how precise her diction is. I don't know if I've ever heard anyone else speak with such clear articulation.

I just finished watching Anton Petrov's video on the poles flipping, then the one front EON. Yours popped up in my feed. It was a nice companion piece and very well done. Thank you!

Meghan Gray always has a wonderful way of explaining things!

Brady, can you do follow-up on this where very precise atomic clocks are used to measure minute changes in gravity and thus allowing to "see inside the Earth" and on top of that attempts to use neutrinos to map interior of the Earth. I know neutrino detector and beam is used to screen through Fukushima nuclear rectors to get a picture how the melted core inside looks like. Neutrino thing is very in its infancy but very precise atomic clock approach is long known.

Discored so much stuff I didn't know before watching this vidoe, and now I have an interest in this subject, thank you!

Hurray for the Schlumbergera. I always get excited to see it in the background.

Dude, this video is just magnificent! Thank you! I wish to work with you guys one day. I have a colleague that will soon, I'm totally jealous hahaha

I love Dr Meghan's videos. Thank you brady for making these awesome videos and thank you Dr Meghan for making them informative and lovely.

Wow, one of the best videos in recent memory!!

It's amazing to hear an astronomer speak so cogently about geology! It's obvious that my field has her enthralled as much as hers has me, and wish I could speak astronomy as well as she speaks geology 😂 Dr. Gray is the best!

finally a new sixty symbols video, where have you guys been?

"Astronomers don't know a lot about magnetic fields" And a thousand juggalos liked this video

Awesome video with extraordinary explanations about North pole(s)... Thank you.

Great video! I had no idea that magnetic north has been moving!

Interesting stuff. As a radio amateur I notice these effects all the time as the Earth's magnetic fields affect radio propagation. I've not been licenced long so I've yet to see a full solar cycle but sporadic E propagation I find amazing. Usually VHF is line of sight or a little beyond but I've seen it open up to Western Sahara. No one fully understands it but it really is interesting to experience

Magnetohydrodynamics? Shouldn't there be thermodynamics in there as well? Magnetothermohydrodynamics. But what if you need to simulate a single electron in that mess? Well, that'd have to be quantum magnetothermohydrodynamics.

I so admire really smart people!! Brilliant and extremely well spoken.

One of the best Sixy Symbols videos ever.

so much knowledge, so much passion! Given away so humbly and yet so clear and engaging. You deserve 7 billion views! Now I know a little more about the place where I live, and the place where I am going to die. Thank you!!!!!

This was super interesting!

Amazingly informative video. Well done.

Amazing videoooo 😍😍😍 keep it up Brady and professors

Thanks for sharing such a detailed video. I don't know why scientists never mention solar activity such as long periods of solar intensity (modern maximum) or the repeating cycle called the grand solar minimum. It's not a coincidence that the poles are moving faster and the previous 4 solar cycles have had less sun spots with a weakening magnetic field. Then there's the south Atlantic anomaly which looks like it's preparing itself to become either a north or south pole. Just wanted to add, imagine if the sun was to hibernate then any notion of a magnetic field on earth is laughable. The driver for the magnetic field must surely be the sun! These satellites are simply measuring the effect that the sun has on our planet. For years now I've seen stories upon stories about migrating animals flying or moving to the wrong place following their inner compass and then dying in a horrific "mass die off". I think humans are in trouble if we experience an excursion because our bodies rely on the magnetic field too. Life expectancy will go back down to low numbers as we try and adapt to the change in polarity. We're in serious trouble. Thanks 👍

It's not true *all* speakers have magnets, altho a large majority do. There *are* electrostatic speakers.

This is an amazing video. Thank you so much!

love the scout drone sound effect while zooming in to the poles

I wonder how the sun's field affects the formation of each planet's field.

I have no idea if this is at all related, but the regularity of the pole flip, along with its "wandering" nature sounds like an Intermediate Axis phenomenon... just kinda has that feel to it...

U killed it although it is very complicated topic and also power points and images were so helpful

I am subscriber in this channel with multiple devices. I like all the scientist how they explain.

...were those the Imperial Probe Droid sound effects? I thought it was just a coincidence with the garbled speech, but the the "wom-wom-wom" sounds kicked in...

"Where Santa lives"... you forgot to include Superman ;-)

Oh my god! Finally a video, you’ve got me waiting wayyyy too long! Thanks tho!

Amazing video thank you so much. I wonder how much effort it takes to do all those measurements on earth !

"It's a very complicated field." I see what you did there.

Do our cell phones do the self correcting when you turn on the compass apps (i.e. the built-in one on the iphone)?

It was a decent explanation. Thank you Sixty symbols 😊!

yay. great vid. very informative

And when everything else fails, follow the birds.

Dr. Gray has been in britain too long; listen to those 't's! (Great video, as always.)

you did a fantastic job describing the main magnetic field a couple things for corrected sense but you got that one in particular detail. There is a name for the spinning motion for gold and nickel core. iron holds unstable feild lines. The magnetic field in the spinning motion of the Earth are bound together without one there's not the other

Great Contribution!!!

According to the Finnish Tourist Board, Rovaniemi is the Official Hometown of Santa Claus in Lapland.

This was the most fabulous animation of an asteroid hitting the Earth I have ever seen

Man that brought me back to my time in maritime navigational school. i remember this initially gave me a headache, combined with deviation and drift. it took some doing to recondition the brain to get it right.

Interesting video, a couple of points first it is not only magnets that deflect a compass it is any iron or steel - that is why when using a magnetic bearing compass you should always take 3 readings preferably at about 120 degrees to each other. The other thing is with the UK now being in the process of moving from a Westerly declination to an East one you need to remember to apply the magnetic compass to true correction the correct way. The zero declination line is just about to pass my house so I will soon be in the Eastern magnetic hemisphere but I can't say I have noticed any difference. It's quite difficult to observe the actual declination not helped by the fact the pole star is displaced from the rotation axis of the earth by about 1/2 degree. In terms of the impact on ships compasses I think the sailing directions contain warnings about areas where there are local magnetic anomalies - I seem to remember there are a couple in the Western Isles of Scotland. The magnetic anomaly chart shown is also used to navigate submarines under water. A combination of the depth of water and the local magnetic deviation provides a position without having to raise the mast with the GPS aerial above the surface and thus possibly giving the position of the sub away.

Lucie Green would be a great scientist to interview if you want to make a video about the sun’s magnetic field.

So Mars lost its atmosphere when its lost its magnetic field. What about Venus? We're told it too lacks a magnetic field, but it has an extremely dense atmosphere, despite being subjected to more intense solar wind than Earth or Mars. How come?

This vedio relates to my astrophysics conjure supported by French science papers. My conjure submitted to MIT Solve 2018. It relates to the moon. My interests lie in the atomic quatum dipoles of systems and their variable nature. And what drives them. My discoveries include a paradox related to the torofluxus and other noneuclian differential geometries. I am a non-credentialed experimental physicist. This was an awesome clip! Thank you!

Such an interesting video! Thank you!

183 documented reversals in the past 83 million years (see comment below) of the magnetic pole flipping. They can see it in rocks from different time periods. This is a scientific fact. It's not a debatable issue like some people seem to think.

Wow! A changing magnetic field would certainly affect the global climate!

Great presentation!!!

Immensely fascinating video.

It's a time of big stress for old-school sailors

This is a big deal in aviation as well. But of course deflection makes a bigger difference.Of course hiking you'll be doing well to go 25 miles in a day. Flying you can go 250 miles in just 30 minutes.

Never thought electromagnetic fields could be so interesting!

More videos with Dr Gray please! 😁

Where does the seed magnetic field come from?

So, what I take from this video is that the Earth's magnetic fields are Imperial probe droids.

Great video and narrative. I have often believed that the planet Uranus is actually experiencing it's own magnetic reversal at this time. My thoughts on the cause of a magnetic field is a relative axis motion between the core and a surrounding viscous fluid. When the delta between the two relative motions are greatest, a magnetic field is strongest. When the delta is lesser, then weaker. When they exchange spinning rates, then the magnetic field reverses. A model of the reversal can be compared to the common illusion seen with old films showing an airplane propellor at engine startup and revup. The film framing constant compares to the earth's core. The propellor compares to the surrounding viscous fluid. Changing the speed of the propellor presents the illusion which compares to the magnetic field intensity changes and reversal.

Thank you for the informations

3:35 We don't know anymore about the earths core than we do about the magnetic field. We ASSUME its solid iron, but when you apply logic, how can the core remain solid when it is surrounded by molten iron?

maybe the magnet field is induced by the solar electric field.

I love these videos so much thank you

Damnit Brady. Your videos keep breaking my brain. Never stop.

My physics professor studies the earth's magnetic field. He makes these gigantic models of earth with salt water ice and measures how the core changes and moves over time. I found it very interesting.

I think they underestimate the danger of a pole shift.

I have been to locations in the Canadian Shield where compasses are very difficult to use if no impossible. There are local magnetic anomalies that can cause the compass to swing up to 180 degrees in just a few hundred yards.

In order to design power supplies, I designed magnetics; transformers, inductors, and baluns. I have a number of formulas I use, but I have no way of explaining what is magnetism. I just use the formulas and the parts work.

Love the droid sounds!

The earths magnetic field might be very complicated, but have you considered magnetic fields?

3:51 'half of Earth's interior' Since we are talking about a volume, should the radius corresponding to half of it not be (Earth's radius) * 1/2^(1/3) = 6371km * 1/2^(1/3) = 5055km ?

Great video !!

8:30 Wakanda!

Liked the 'Hoth probe' sound from Empire Strikes Back.

Amazing video, thanks

Oh, that was interesting. :) Didn't come as a shock to me that it was, since I'm used to the whole "we don't know" intro to a subject like that. But do more of those :D

27 flat Earthers couldn't handle this.

I feel slighted. On one hand, this video was 20 minutes, but on the other Meghan's conversational style made it go by too fast.

Once the magnetic reversal is done and the poles are no longer moving, (for a while) do you think that the poles will be renamed or call what's in the North, the South pole?

🌏 Love the Ice Planet Hoth - Imperial Probe-Droid Sound effects. Very apt.