Such phenomenon as magnetism is known to mankinda long time ago. Its name is due to the city of Magnetia, which is located in Asia Minor. It was there that a huge amount of iron ore was discovered. The very first mention of the unique properties of the magnet can be found in the works of Titus Lucretia Kara, who wrote about this in the poem "On the Nature of Things", around the 1st century BC.
Since ancient times people have found applicationunique properties of iron ore. One of the most common devices, whose action was based on the attraction of metals, became a compass. Now it is very difficult to imagine different industries in which simple magnets and electromagnets would not be used.
The magnetic field of the Earth is the region arounda planet that protects it from the harmful effects of radioactive solar radiation. On the origin of this field, scientists argue to this day. But most of them believe that it was due to the core of the Earth. The center of our planet has a liquid outer and solid inner component. When rotating, the liquid part of the nucleus moves, the charged electric particles move and a so-called magnetic field is formed.
The magnetic field of the Earth is also calledmagnetosphere. The concept of "magnetism" is a comprehensive and global property of nature. At the moment, it is impossible to create a completely complete theory of solar and terrestrial attraction, but now science is trying to figure it out in many respects and it manages to give a fairly convincing explanation of various aspects of this complex phenomenon.
В последнее время ученые и простые граждане в are greatly concerned about the fact that the Earth's magnetic field is gradually weakening its influence. It has been scientifically proven that the magnetic field has been steadily weakening over the past 170 years. This makes one wonder, since it is a kind of shield that protects the Earth and the living nature from the terrible radiation effects of sunlight. The Earth's magnetosphere resists the flow of all such particles that fly toward the poles. All these streams are retained in the upper atmosphere at the poles, forming a beautiful phenomenon - the northern lights.
Если вдруг магнитное поле Земли исчезнет или в will greatly weaken, then everything on the planet will be directly influenced by cosmic and solar radiation. In turn, this will lead to radiation diseases and damage to all living organisms. The consequence of such a disaster will be terrible mutations or complete death. To great relief, this development is unlikely.
Paleomagnetologists were able to providesufficiently reliable data that the magnetic field is constantly fluctuating, and the period of such oscillations is different. They also compiled an approximate curve of the field oscillations and found out that at the moment the field is in a falling position and will decrease for another couple of thousand years. Then it will again become stronger for 4 thousand years. The last maximum of the magnetic attraction was at the beginning of the present era. The reasons for this instability are very diverse, but there is no specific theory on this matter.
It has long been known that many magnetic fields havenegative impact on living organisms. For example, experiments on animals have shown that an external magnetic field can delay development, slow the growth of cells and even change the composition of blood. That is why magnetic storms lead to deterioration of health of meteodependent people.
For man, the Earth's safe magnetic field -this field with a value of tension not more than 700 oersteds. It should be noted that this is not about the actual magnetic field of the Earth, but about the electromagnetic fields that are formed during the operation of any radio and electrical device.
The physical side of the process of influence is preciselythe Earth's magnetic field per person is still not entirely clear. But it was found out that it affects plants: the germination and further growth of seeds directly depend on their initial orientation with respect to the magnetic field. And its change can either accelerate or slow down the development of the plant. It is possible that someday this property will be used in agriculture.
The Earth's magnetic field strength is strengthits attraction. In some places it fluctuates, but the average is 0.5 oersted. In some places (in so-called magnetic anomalies) the tension increases to 2E.
