Magnetic Declination on Azimuthal Equidistant map 1590-2020

Years 1590-2020
Information on the data:
We present a new model of the magnetic field at the core–mantle boundary for the interval 1590–1990. The model, called gufm1, is based on a massive new compilation of historical observations of the magnetic field. The greater part of the new dataset originates from unpublished observations taken by mariners engaged in merchant and naval shipping. Considerable attention is given to both correction of data for possible mislocation (originating from poor knowledge of longitude) and to proper allocation of error in the data. We adopt a stochastic model for uncorrected positional errors that properly accounts for the nature of the noise process based on a Brownian motion model. The variability of navigational errors as a function of the duration of the voyages that we have analysed is consistent with this model. For the period before 1800, more than 83 000 individual observations of magnetic declination were recorded at more than 64 000 locations; more than 8000 new observations are for the 17th century alone. The time–dependent field model that we construct from the dataset is parametrized spatially in terms of spherical harmonics and temporally in B–splines, using a total of 36 512 parameters. The model has improved the resolution of the core field, and represents the longest continuous model of the field available. However, full exploitation of the database may demand a new modelling methodology.

[buzzdev]

That's a nice one Steve! Thanxs...
It actually perfectly shows a cross section of the 3d magnetic vortex over the plane

[KarenB]

Wow, this is cool, thanks again Steve :)

[FlatDan]

Hah. Funny. I went searching for "Magnetic Declination on Azimuthal Equidistant map" and ended up here, only to find out that I'm already a subscriber. =) Cheers and thanks!

[noh_d]

Thank you steve to accept my request. I can see now. I asked you that because I've developped something good about the elevation (altitude) during a circular motion path connected to the magnetic field zone that covering the pond. At the blue polarity it has to be a lower altitude than the red polarity, don't ask me how I found it, I use to watch something that follow a path into the sky and look at the declination map and the altitude datas to see when the altitude change (just a small differencial between 25-40 max km only, this is alot for a human being scale but for something into the sky above a pond scale in a large circular motion it's nothing, I've watched it for hours in a month). The modern era is interesting.
I was surprised 2 months ago when I watched this things into the sky above the russia with a greater elevation (I though it will be blue ), but now I understand : the red polarity is there. What I deduced from my observation does fit the model and disrupt the possibility that something does orbiting a ball because this thing follow perfectely the differential altitude of polarities (nothing using gravity). So we do have something following a circular motion (maybe more elliptical) in diagonal (seen from side view up/down progressively with the altitude differential due to polarities).
The magnetic field is the enought factor to generating a circular motion in a constant velocity, but to reach the velocity when it began, idk know what it is (for the celestials bodies). I keep your video on my desk :) thank you.

[Cattakeover]

Awesome work it seems that magnetic north is getting closer to true north and fast do you think over time they were just getting better measurements or is north really moving

[Phaxxify]

Earth is flat sure. But this map is incorrect obviously. The "magnetic declination" attests to that.

[ytrebiLeurT]

What exatly does it proof ? Does is mean that both auroras can yet be on a flat plane ? Do I understand it correctly, yes ?
I ask because I am still searching an explanation how it can be possible having two auroras on a flat plane because actually it is only possible on a sphere as you know.
Thank you.