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How much has earth magnetic field decreased?

Updated: 8/21/2019
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9y ago

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There is no evidence that it has decreased.

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9y ago
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Q: How much has earth magnetic field decreased?
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Does mars has magnetic field?

Yes, but it is much less than Earth's.


What organisms are able to sense earth's magnetic field and why?

Many (but not all) birds, fish,, insects, etc. have the ability to sense earth's magnetic field. They use this ability for navigation purposes, much as we use magnetic compases.


Why doesn't the moon have a magnetic field?

Venus does not have a magnetic field because its rotational period is very slow. This means that if its core had a liquid metal component, it would not be moving fast enough to generate a field.


Does the earth rotation effect the sun in any way?

If there is any effect at all, it would need to be a very tiny one. The only way that the Earth's rotation might affect the Sun would be in the way the Earth's rotation generates Earth's magnetic field. Our magnetic field affects the way that coronal mass ejections, huge bubbles of ionized gas from the Sun, behave when they get close. But the Sun has a magnetic field of its own, much stronger than the Earth's field, and it is unlikely that the Earth's magnetic field would affect the Sun or the Sun's magnetic field in more than a minuscule fashion.


What does the Earth's magnetic field do on Earth?

One does not necessarily think of the Earth's magnetic field every day, but it does some important things. First, everyone knows, the Earth's magnetic field influences all magnets on Earth and the compass is the most famous. The Earth's magnetic field allows you to use a compass. Even without a compass some birds are able to detect the Earth's magnetic field and get a sense of direction. Second, the Earth's magnetic field protects us from the solar wind which is a high energy stream of charged particles coming out of the Sun. Occasionally, there is a great burst of these particles associated with a solar flare. Without the Earth's magnetic field these particles would hit Earth's atmosphere and create additional radiation. Though that radiation would not threaten life on Earth, it may be quite harmful. Satellites are a different matter and the assault of the charged particles has important consequences on GPS and communications and without the magnetic field The solar wind and the Earth's magnetic field together form the Aurora Borealis, the Northern Lights, so they would be gone without the Earth's magnetic field. The solar wind and the Earth's magnetic field are the main ingredients to what is now called solar weather. There is a complex interplay between the Earth, its atmosphere and the magnetic field which is currently the subject of much study. Oddly, the Earth's magnetic field helps hold on the the air. One way the Earth loses air is that the highest air particles are hit by the solar wind and knocked off the Earth. That is very much decreased because the Earth's magnetic field deflects most of the solar wind. There is some reason to believe that Mars lost its atmosphere after it lost its magnetic field and that is why Mars has only 1% as much atmosphere as Earth. Sometimes the Earth's magnetic field disappears or reverses or just gets all jumbled up when the currents that cause it in the Earth's core become erratic. This hasn't happened for about 10,000 years, but the geologic record shows that it has happened dozens of times and the length of calm periods like now can be a few thousand or a few million years long. A reversal of the Earth's magnetic field takes a few hundred years to settle down again, and so during that time your compass won't work, birds may be confused, Northern Lights become a vague glow and GPS and cell phones may be replaced by maps and wires. And, of course, it will be good to have stock in companies that sell sun screen.


Does Jupiter have a magnetic field?

Jupiter has a large, complex, and intense magnetic field that is thought to arise from electrical currents in the rapidly spinning metallic hydrogen interior. The Earth has a strong magnetic field, but Jupiter's magnetic field at the tops of its clouds is 10 times stronger than that of the Earth. Further, the Jovian magnetic field has much higher complexity than that of the Earth, with some aspects of Jupiter's fields having no Earthly counterpart. The intensity and complexity relative to the magnetic field of the Earth is presumably related in some way to the more rapid rotation and larger metallic interior for Jupiter.yes


What effects does the core have on the earth's climate?

Since the earth's core produces a magnetic field, it has a major effect on the climate. The magnetic field keeps the dangerous rays of the sun away from the earth making it much more habitable by all creatures.


What effect does the solar winds have on the earth's magnetic field?

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What effect does the solar winds have on Earth's magnetic field?

Solar wind has a large effect on the earth.. It brings these clouds (cant remember name) down. which affects electricity very much. Due to the magnetic field of the clouds


Why Mars today lacks a global magnetic field like that of Earth?

Mars is much smaller, and therefore contains much less thermal energy. The lesser thermal energy caused Mars to cool faster than the Earth. Without heat in the core, Mars will not generate a magnetic field (the rapidly spinning core is a dynamo of magnetic energy).


How is earth's magnetic field like the magnetic field of a natural magnet?

A magnetic field is induced by the movement of electrons.In an electromagnet, the flow of current ensures this.In a permanent magnet; there is a grouping of 'magnetic domains' in which the alignment of the spin of a group of electrons is similar; will produce a permanent magnetic field. In this case the movement of the electrons is their property of 'spin'.The Earth's magnetic field is generated by the net sum of electric currents generated in the mantle, produced by movement of the hot materials.Note, that the 'Curie Point' (discovered by the Curies), is a temperature above which a magnet may not hold its magnetism. The thermal disorder takes precedence over the previous alignment of the electron spins.Because of the Curie Point, there is no possibility of a permanent magnet existing in the interior of the Earth and causing the Earth's magnetic field.The Earth's magnetic field varies with time, and has reversed its polarity on several occasions. It also varies somewhat with the effects of the charged 'solar wind'. When there is a 'mass coronal ejection' and if it happens to face the Earth at that time, the Earth's magnetic field will be severely disrupted.In the 1859 'Carrington Event' such a storm caused much damage to the electric circuits of the day. Such an event today could well essentially destroy modern civilization.One such Coronal Mass Ejection occurred on July 2012, but fortunately was pointed away from Earth.


What is the magnetic field expressed in gauss of a refrigerator magnet with a magnetic field of 0.3T?

Thw magnetic fringe field should not exceed how much gauss units?