The Shifting Position Of The North Magnetic Pole Since 1590

Map created by CavitThe map above shows how much the North Magnetic pole has shifted between 1590 and today.

From the map’s author:

Positions of North Magnetic Pole of the Earth.

Poles shown are dip poles, defined as positions where the direction of the magnetic field is vertical.

Red circles mark magnetic north pole positions as determined by direct observation, blue circles mark positions modelled using the GUFM model (1590–1890) and the IGRF-12 model (1900–2020) in 1 year increments.

For the years 1890–1900, a smooth interpolation between the two models was performed. The modelled locations after 2015 are projections.

Why and How the Earth’s North Magnetic Pole Shift

The Geodynamo in the Outer Core

• Molten outer core: Earth’s magnetic field originates primarily in its liquid iron–nickel outer core. Convection currents in the molten metal, combined with Earth’s rotation, create electric currents. These currents generate a magnetic field through what is called the geodynamo.
• Constant flux: Because the flow patterns in the outer core are dynamic (like weather patterns on Earth’s surface, but on geologic timescales), the magnetic field is never entirely static. This leads to gradual “secular variation”, or drift, in the field configuration.
• Pole wandering: The magnetic poles are where field lines are most strongly vertical. As the magnetic field changes, these “verticality” points move. The North Magnetic Pole has therefore been wandering across the Arctic.

Rate of Drift

• Over the last century and a half, the speed of the North Magnetic Pole’s motion has varied significantly.
• In the early 20th century, it moved roughly 10 km per year.
• Around the late 20th century and early 21st century, measurements indicated the drift speed increased to over 50 km per year.
• Recently, there have been indications that the speed may have slowed somewhat again, but the pole still continues to move in the general direction of Siberia.

A Brief History of North Magnetic Pole Observations

1. James Clark Ross (1831):
   The British explorer who made one of the first well-documented discoveries of the approximate location of the North Magnetic Pole on the Boothia Peninsula in Canada.
2. Later Arctic Explorers (late 19th–early 20th centuries):
   Explorers like Roald Amundsen confirmed that the pole was no longer exactly where Ross first found it, noting a shift of tens of kilometers over the decades.
3. Modern Measurements (Mid-20th century to Present):
   Satellite technology (like the European Space Agency’s Swarm mission) and global observation networks give us real-time tracking of the magnetic field. They have documented the significant acceleration in the pole’s drift rate in recent decades.

The Carrington Event (1859) and Geomagnetic Storms

The Solar Superstorm

• What Happened: On September 1–2, 1859, astronomer Richard Carrington observed an intense white-light solar flare on the Sun. The associated coronal mass ejection (CME) hit Earth roughly 17 hours later, causing the Carrington Event, the largest recorded geomagnetic storm in history.
• Effects on Earth: Telegraph systems across North America and Europe failed or caught fire; auroras were seen as far south as the Caribbean.
• Relevance to Pole Shift: Solar storms and CMEs can temporarily disturb Earth’s magnetic field, creating geomagnetic storms. However, long-term pole shifts are tied more to core fluid dynamics (the geodynamo) than to external solar activity. Events like the Carrington superstorm can produce short-lived perturbations but do not directly cause the slow secular drift of the poles.

Geomagnetic Reversal: History and Mechanism

What Is a Geomagnetic Reversal?

A geomagnetic reversal occurs when the North and South Magnetic Poles effectively swap positions.

In the rock record, this can be seen as a flip in the orientation of magnetic minerals, which align with Earth’s ambient magnetic field at the time of their formation.

Historical Record

• Brunhes–Matuyama Reversal (~780,000 years ago): The most recent major, well-confirmed reversal in Earth’s geological record.
• Frequency: Over the past 20 million years, reversals have occurred on average every 200,000 to 300,000 years, but the timing is irregular and can vary greatly.
• Multiple Reversals: Analysis of ocean floor basalts (especially along mid-ocean ridges) has revealed a “barcode” pattern of magnetic stripes. These stripes reflect past reversals as new crust is created at the ridges and locked in the prevailing magnetic polarity.

Timescale and Process

• Gradual Flip: Contrary to the idea of an “overnight flip,” reversals often unfold over thousands of years. During these transitions, the magnetic field can become weaker and more complex, with multiple “north” and “south” poles possibly appearing in different locations.
• Field Strength Decline: Some measurements suggest Earth’s overall magnetic field strength has decreased by around 10-15% in the last 150–200 years, prompting speculation about whether a reversal might be “due.” However, the field has weakened and recovered many times in the past without a complete reversal.

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