What makes magnetic fields of earth

Respect the other person. It will not kill you to agree to disagree. As long as no one has a weapon. Absolute power corrupts absolutely. To finish your wisdom of walking down a path you have never taken is hard for people to do. But let me tell you people. It will be the most liberating thing you will ever do in your life. The fact that it has gotten so much bigger under his term. And the lightning that hit the San Francisco. Do you all think that is normal?

After the major loss of the fires last year and the ones 2 years prior to that I stated that they were not done… And once again, here we are. They are not done. So just a little something to think about. Its the lazy way out. Aloha my ass. Is it considered with the growth of electrical devices used across the globe in a wave like motion as the earth revolves. Your email address will not be published. Thank you for expressing interest in joining our mailing list and community.

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Want to read more articles like this? But at high temperatures, metals lose their magnetic properties. The effect works in the same way as a dynamo light on a bicycle. Magnets in the dynamo start spinning when the bicycle is pedalled, creating an electric current. The electricity is then used to turn on the light. This process also works in reverse. If you have a rotating electric current, it will create a magnetic field. On Earth, flowing of liquid metal in the outer core of the planet generates electric currents.

The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet. The magnetic field is extremely important to sustaining life on Earth. However, significant non-dipolar terms in an accurate description of the geomagnetic field cause the position of the two pole types to be in different places. The strength of the field at the Earth's surface ranges from less than 30 microteslas 0. The average magnetic field strength in the Earth's outer core was measured to be 25 Gauss, 50 times stronger than the magnetic field at the surface.

The field is similar to that of a bar magnet. The Earth's magnetic field is mostly caused by electric currents in the liquid outer core. The Earth's core is hotter than K , the Curie point temperature above which the orientations of spins within iron become randomized.

Such randomization causes the substance to lose its magnetization. Convection of molten iron within the outer liquid core, along with a Coriolis effect caused by the overall planetary rotation, tends to organize these "electric currents" in rolls aligned along the north-south polar axis.

When conducting fluid flows across an existing magnetic field, electric currents are induced, which in turn creates another magnetic field. When this magnetic field reinforces the original magnetic field, a dynamo is created that sustains itself. This is called the Dynamo Theory and it explains how the Earth's magnetic field is sustained.

Another feature that distinguishes the Earth magnetically from a bar magnet is its magnetosphere. At large distances from the planet, this dominates the surface magnetic field. Electric currents induced in the ionosphere also generate magnetic fields.

Such a field is always generated near where the atmosphere is closest to the Sun, causing daily alterations that can deflect surface magnetic fields by as much as one degree. Typical daily variations of field strength are about 25 nanoteslas nT i. The currents in the core of the Earth that create its magnetic field started up at least 3, million years ago. Magnetometers detect minute deviations in the Earth's magnetic field caused by iron artifacts , kilns, some types of stone structures, and even ditches and middens in archaeological geophysics.

Using magnetic instruments adapted from airborne magnetic anomaly detectors developed during World War II to detect submarines, the magnetic variations across the ocean floor have been mapped. The basalt — the iron-rich, volcanic rock making up the ocean floor — contains a strongly magnetic mineral magnetite and can locally distort compass readings. The distortion was recognized by Icelandic mariners as early as the late 18th century.

More important, because the presence of magnetite gives the basalt measurable magnetic properties, these magnetic variations have provided another means to study the deep ocean floor. When newly formed rock cools, such magnetic materials record the Earth's magnetic field. Frequently, the Earth's magnetosphere is hit by solar flares causing geomagnetic storms , provoking displays of aurorae. The short-term instability of the magnetic field is measured with the K-index.

Recently, leaks have been detected in the magnetic field, which interact with the Sun's solar wind in a manner opposite to the original hypothesis. During solar storms , this could result in large-scale blackouts and disruptions in artificial satellites. Based upon the study of lava flows of basalt throughout the world, it has been proposed that the Earth's magnetic field reverses at intervals, ranging from tens of thousands to many millions of years , with an average interval of approximately , years.

There is no clear theory as to how the geomagnetic reversals might have occurred. Some scientists have produced models for the core of the Earth wherein the magnetic field is only quasi-stable and the poles can spontaneously migrate from one orientation to the other over the course of a few hundred to a few thousand years. Other scientists propose that the geodynamo first turns itself off, either spontaneously or through some external action like a comet impact , and then restarts itself with the magnetic "North" pole pointing either North or South.

External events are not likely to be routine causes of magnetic field reversals due to the lack of a correlation between the age of impact craters and the timing of reversals. Regardless of the cause, when the magnetic pole flips from one hemisphere to the other this is known as a reversal, whereas temporary dipole tilt variations that take the dipole axis across the equator and then back to the original polarity are known as excursions.

Studies of lava flows on Steens Mountain , Oregon, indicate that the magnetic field could have shifted at a rate of up to 6 degrees per day at some time in Earth's history, which significantly challenges the popular understanding of how the Earth's magnetic field works. Paleomagnetic studies such as these typically consist of measurements of the remnant magnetization of igneous rock from volcanic events.