can magnetic field of earth is zero after some years.?

Answer 1

Magnetic field of Earth :

Magnetic field variations

Geomagnetic variations since last reversal.The strength of the field at the Earth's surface ranges from less than 30 microteslas (0.3 gauss) in an area including most of South America and South Africa to over 60 microteslas (0.6 gauss) around the magnetic poles in northern Canada and south of Australia, and in part of Siberia.

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.

Magnetic field reversals :
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 250,000 years. The last such event, called the Brunhes-Matuyama reversal, is theorized to have occurred some 780,000 years ago.

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 magnetic "North" reappears in the opposite direction this is a reversal, whereas turning off and returning in the same direction is called a geomagnetic excursion.

This has been found to be true by measuring magnetism along deep ocean trenches. The molten lava is emitted from volcanoes at well over the Curie temperature and then cools to adopt whatever magnetic field was present at the time. As time goes on more lava flows and bands of opposite magnetic fields are made present.

Using a magnetic detector (a variant of a compass), scientists have measured the historical direction of the Earth's magnetic field, by studying sequences of relatively iron-rich lava flows. Typically such layers have been found to record the direction of Earth's magnetic field when they cool (see paleomagnetism). They have found that the poles have shifted a number of times throughout the past.

Citing oceanic basalt 3He/4He ratios and other evidence, J. Marvin Herndon et al contend that the inner core of the Earth is not iron but much denser atoms. Nuclear reactions as replicated in a fast breeder reactor are suggested to take place and this accounts for the change in the Earth's magnetic field

Chances of the earth's magnetic field reducing to zero does not seem to be possible as per the present situation..

Answer 2

No, what's actual occurring is the Earth's magnetic field is, like Tim stated, countless extremely each and all the time and that's expected that for the era of 1000 to 3 thousand years the magnetic field will replace so dramatically that the sought after-day north pole will replace into the south pole and vice versa. in actuality fairly affecting compasses.

Answer 3

NO... how could the earth's magnetic field go to zero, when it comes from the HUGE IRON DEPOSITS within the earth itself?

Your knowledge of basic science and geology is even worse than your spelling

Answer 4

The earth's magnetic field is not stationary, and every several thousand years it "flips" so that the South magnetic pole becomes North and vice-versa (think of the chaos to navigation that would cause if it happened in our lifetime!) but there's no evidence that it is weakening.

Answer 5

Please rephrase. But even better, look up magnetic field, you will find the answer.

Answer 6

yeah yes , time has come to be de-magnetised.