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boy genius
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is it true that the Earth's magnetic field is changing so that magnetic north will be directional south and vice versa.
and if so how is it doing it
and if so how is it doing it
http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htmScientists have long known that the magnetic pole moves. James Ross located the pole for the first time in 1831 after an exhausting arctic journey during which his ship got stuck in the ice for four years. No one returned until the next century. In 1904, Roald Amundsen found the pole again and discovered that it had moved--at least 50 km since the days of Ross.
The "more to it" is that to be susceptible to picking up the same orientation as the then current magnetic poles, the rocks have to be hot enough for their magnetic domains to realign with the Earth's field. Because of this, it should be clear why most of this rock with ancient compass orientations frozen into it is found around volcanos.Mr. dude said:The poles attract certain elements in the rock, which make them piont at where the pole is attracting them from. Theres probably more to this but just to give you the basic idea I posted.
even animals that also rely on directional magnetism,
I hadn't heard this. You wouldn't happen to have a link to a discussion/explanation of this would you?SOS2008 said:The decrease results in loss of atmosphere...
A quick Internet search with "Magnetic Field and Atmosphere" yielded several sites on the topic. There are different variables, the sun's magnetic field or "Interplanetary Magnetic Field" or "IMF," the solar winds, the density of a planet's atmosphere, etc.zoobyshoe said:I hadn't heard this. You wouldn't happen to have a link to a discussion/explanation of this would you?
http://spaceweather.com/glossary/imf.htmlEarth has a magnetic field, too. It forms a bubble around our planet called the magnetosphere, which deflects solar wind gusts. (Mars, which does not have a protective magnetosphere, has lost much of its atmosphere as a result of solar wind erosion.)
That site links to this site:SOS2008 said:A quick Internet search with "Magnetic Field and Atmosphere" yielded several sites on the topic. There are different variables, the sun's magnetic field or "Interplanetary Magnetic Field" or "IMF," the solar winds, the density of a planet's atmosphere, etc.
http://spaceweather.com/glossary/imf.html
The Earth's magnetic field is constantly changing and has been doing so for millions of years. Scientists have observed that the strength and direction of the magnetic field vary over time, with some periods of stability and others of rapid change. These variations are caused by the movement of molten iron in the Earth's outer core, which generates the magnetic field.
The Earth's magnetic field plays a crucial role in protecting our planet from harmful solar and cosmic radiation. Changes in the magnetic field can lead to variations in the amount of radiation that reaches the Earth's surface, which can impact the functioning of satellites, communication systems, and even animal migration patterns. Additionally, changes in the magnetic field can also affect the accuracy of compasses and navigation systems.
Yes, there have been significant long-term changes in the Earth's magnetic field over the course of its history. The most notable of these is the phenomenon known as magnetic field reversal, where the North and South magnetic poles switch places. This has occurred many times in the Earth's history, with the last reversal happening approximately 780,000 years ago.
While it is possible for the Earth's magnetic field to weaken or even reverse, it is unlikely to disappear entirely. The core of the Earth is constantly replenishing the magnetic field, and even during periods of weakened field strength, it is still strong enough to provide adequate protection from harmful radiation.
There is ongoing research into the potential relationship between changes in the Earth's magnetic field and climate. Some studies have suggested that magnetic field variations can influence the amount of cosmic rays that reach the Earth's atmosphere, which could potentially impact cloud formation and, therefore, climate. However, more research is needed to fully understand this potential connection.