Something is happening deep under the Earth's crust. And that something is changing our planet's magnetic field, which is so important to our life and safety. According to some, pretty soon we are waiting for a very serious event — the change of the magnetic poles.
The gradual weakening of the magnetic field of the planet can take hundreds or even thousands of years. But not as severe fluctuations can last for months and for some time to leave all satellites virtually defenseless. At least, this picture reveals a study compiled data collected by the orbiters for the last 9 years. Based on them, the scientists built a model showing how the sudden change of currents in the liquid core of the Earth's magnetosphere are changing our planet.
The Earth's magnetosphere is created by rotating molten conductive core of the planet and extends about 58 thousand miles into space. This field forms a sort of "cocoon" shaped elongated drop and which protects the planet from a variety of troubles — primarily from cosmic rays and from particularly harmful solar radiation.
The last major change in the pattern occurred about 780 thousand years ago, when the Earth's magnetic poles are reversed (this happens from time to time).
This process is accompanied by a temporary weakening of the magnetic field, followed by a period of rapid recovery and reorganization, with a new polarity. Some studies suggest that the next change of poles is very, very close — however, these data are far from certain.
Observations of interactions between the molten core of the Earth and it generates a magnetic field, German scientists are using orbiting satellites Oersted and CHAMP. Based on the data collected by these devices could create a model of the nuclear motion, which is perfectly consistent with the changes recorded in the magnetosphere. Scientists believe that the weakening of the magnetic field in the region of the South Atlantic anomaly can serve as a serious warning: if it indicates a general weakening of the magnetosphere, we can not be sure about the orbiting satellites, which can be almost face to face with the harsh radiation and energetic particle emanating from the sun.
Another sign of the coming pole shift — a general weakening of Earth's magnetic field, which in the past 150 years waned, estimated at about 10%. So Mioara Mande continue the research with colleagues, trying to build the most accurate model, which will allow safe to say, when we are waiting for this big magnetic disaster.