the magnetic field of Earth can be affected by any circumstance?
370987
It varies all the time. It has even completely reversed many times over geologic history, but I have never heard any good theories as to why.
127673
Yes, if the magnetic field disappeared, there would be more radiation reaching the earth and this would cause adaptations to occur.  There's been some research into what has happened to plants and animals around the Chernobyl nuclear power plant in Russia that melted down and is still leaking radiation.\n\nNow, given that magnetic fields diminish and become spotty during magnetic pole reversal, some adaptation may occur but I'm not sure it will cause wholesale adaptation events.  These reversal events have occured about once every 5,000 to 50,000,000 years and larg land animals have survived for hundreds of millions of years so, yes, I think that they might be able to adapt quickly enough during some periods of low to no magnetic field.\n\nAlso, I think that ocean life will go relatively unaffected because water will help absorb some of this radiation.\n\nHowever, I'm sure some biologist or someone with greater knowledge than myself in this area will come along and prove me wrong. :^)\n\n-- \n\nAfter posting this, I read an article in March 2006 Scientific American on the problems of cosmic rays with respect to interplanetary space travel.  They noted in the article that it is a misconception that the magnetic field is the most significant form of protection from cosmic rays -- that it is the atmosphere itself that provides the greatest source of protection from cosmic rays.\n\nhttp://www.sciam.com/article.cfm?chanID=sa006&colID=1&articleID=000D6A37-E75F-13F5-A75F83414B7FFE9F
925593
Don't pay any attention to the girl who said, "So we won't float away." The earth's magnetic field has nothing to do with holding us to the earth. What seems to be happening, and this is still in the theory stage, is this. The solid inner core which is almost entirely iron and the liquid outer core which is probably composed mainly of a nickel-iron alloy are rotating at different speeds and because of the turbulence in the outer core they act together as a giant electric generator (dynamo) to produce an electric current. This in turn produces a magnetic field in the same way as an electric current passing through a coil forms an electromagnet. In other words the earth is a giant electromagnet which produces a field that can be measured far into space.
141095
A magnetic field has a north and south polarity. Gravitation is mostly the same every where on Earth.
827354
The magnetic field of Earth is caused by molten iron rotating around in the core.  The lines of magnetic flux follow the right-hand rule (RHR).  Curve the fingers of your right hand into a loose fist and extend your thumb upward.\n\nAs the molten iron swirls around in the direction of your curled fingers, the flux is emitted in the direction of your extended thumb.  The flux is created because the swirling molten iron creates an electrical current that follows the swirl.  That current, like a current going through a coil, creates the magnetic flux.\n\nA flux is simply a line of force and that force, like all forces, has direction.  In this case, the force points outward in the direction of your thumb.  That's called the magnetic north pole, by convention.  \n\nHowever, because the magnetic flux exits the Earth at this pole it really is the south pole.  This can be verified because the north pole of a compass needle will point north and, as you well know, north is attracted to south.  Thus, the magnetic north pole is really the south pole...argh...physics is so complicated.\n\nAs to why like poles repel and dissimilar poles attract, blame in on the direction of the forces...the flux of that magnetic current.  (Magnetism does not really flow, but the forces act as though it does.)  Two similar poles either push each other away (e.g., two south poles) or pull away from each other (e.g., two north poles) because the forces are toward or away from the two magnets respectively.  Two dissimilar poles attract each other because the alligned forces pull one toward the other when they are all in the same direction.  [See source.]
300354
There was a report on Discovery that Earth maginetic field is shifting.this shift of poles will take thousand of years so there is no sudden change.During this change magnetic field will completely stop and there will be no defense againest solar radiation.This will cause cancer to human biengs.\nthere is a movie,"The Core" in which they shown the after effects of eliminated magnet field.
311125
Yes.  There is a magnetic field surrounding the earth that usually stops these.  This field is thin at the poles.  At the poles the solar weather interacts with the atmosphere and creates the Aurora Borealis.  If there is really intense solar  weather (usually ever 5 to 10 years) there will be radio blackouts, borealis closer to the equator, and satellite damage.
346576
Nope. \nThere is some evidence that people can sense the magnetic field of the earth and tell which way magnetic north is. But as for true north no one can do that without knowing the magnetic variation for the location they are at.\nWell if you know the time of year and about where you are you could tell true north from the stars but that would be about the same as knowing the magnetic variation for your location.
1049735
It appears that this is unlikely.  The Vaastu Shastra is a compilation of various ancient texts and relate primarily to use of space and building to satisfy the primary gods of the cardinal points.  They are heavily aligned to spacial points which were considered energy bearing in ancient time and to some modern schools of religious thought as related to the ancient.  Unfortunately in regards to your question the magnetic fields of the Earth are not aligned with the cardinal points and are actually continually fluctuating due to vagaries inside the Earth and as they are impacted by cosmic influences, especially the activities of the Sun.
688899
The human body is not capable of being made magnetic.  It shows virtually no response to magnetic fields as high as 3 Tesla and more--and as a reference, the magnetic field of the earth is 0.0005 Tesla...\n\nA sufficiently intense magnetic field COULD levitate the human body, though--it's been done with bugs and frogs, without any perceptable injury or even awareness of the field.
427541
The magnetic field prevent excess of radiation and matter from sun to approch the earth. For example when an explosion occurs on the sun's surface...\nAs we know that explosion release a lot of energy which try to reach the earth. The magnetic field of earth block them. That why in polar region we see those green waves in the sky at night...\n\nWithout those explosion, the sun still send excess of light. The light contain excess of ultraviolet radiation and the percentage is too small for the magnetic waves of the earth to block it.\n\nHence the ozone layer filters the light and allow little ultraviolet rays to enter the atmosphere...
486058
No.The magnetosphere is the result of Earth`s magnetic field. It depends directly on the magnetic field. But is not expanding or getting smaller, at least not at a large scale. There are variations, but little ones. The magnetic field is created by Earth`s spinning melted iron core. If the angular speed of the core decreases or increases, then the magnetic field and the magnetosphere will do the same thing. For now, thank`s God, is constant.
311306
It's the variation between the magnetic north pole and the geographic north pole.  It varies depending on your location.
177385
It's incredible how many crazy answers are given on this page. \nThe Earth's magnetic field is originated by the convection of molten iron and nickel within the outer planetary core.\nSo, the answer to your question is that the only way to switch off the Earth's magnetic field would be to freeze all that liquid metal. This will happen naturally by the way, but in some billion years.\nAnd tell us, why are you asking this?
1001354
I would assume that a eclipse of the sun, not a lunar eclipse affect the magnetic field of the earth a little bit, for a simple reason. The earths magnetic field is deformed by the solar wind, a constant stream of charged particles from the sun. Now if we have a solar eclipse it means that the moon is between the sun and the earth, and by that shielding some of the solar wind. But as the moon is much smaller then the earth this effect is probably not very large.
1048978
Doubtul.  The earth's magnetic field simply isn't that strong.  If it were, it would overwhelm any electronic devices on earth due to induced current.  While overall it's strong enough to protect us from harm from the solar wind and other nasty charged particles in space, it's not strong enough to harness locally for any useful work.
698914
For a world to have a (global) magnetic field, it must have a liquid metallic core and it must rotate fast enough.  The Moon is solid throughout (we believe) and it doesn't rotate nearly fast enough even if it did have a molten interior.