Proof of a strong initial magnetic field around the earth, Rotating molten iron deep in the earth creates a protective magnetic field on our planet. This magnetic field is invisible, but vital for life on earth: Protect the planet from harmful solar winds and cosmic rays of the sun.
Given the importance of the magnetic field, scientists are trying to determine how the field has changed during the course of Earth’s history.
This knowledge can provide clues to understanding the future development of the earth and the development of other planets in the solar system. the strong initial magnetic field around the earth.
A new study shows that the magnetic field that first formed around the earth is even stronger than scientists had predicted.
Today’s magnetic shield is made in the outer Earth’s core. The intense heat in the dense inner core of the earth causes the outer core – which is composed of molten iron – to rotate and relax, produce an electric current and trigger a phenomenon called geodynamics that feeds the earth’s magnetic field. a strong initial magnetic field around the earth.
Currents in a liquid outer core are strongly influenced by heat coming from a solid inner core.
Because of the extreme location and temperature of materials in the core, scientists cannot measure the magnetic field directly.
Fortunately, minerals that rise to the surface of the earth contain small magnetic particles that settle in the direction and intensity of the magnetic field when the mineral cools from its melting state.
Using new paleomagnetic data, electron microscopy, geochemistry, and paleo, the researchers determined the date and analyzed zircon crystals, the oldest known terrestrial material collected at locations in Australia.
The zircon, which is about two tenths of a millimeter in size, contains even smaller magnetic particles which include the magnetization of the earth at the time of zircon formation.
Previous Tarduno studies have shown that the Earth’s magnetic field is at least 4.2 billion years old and has existed for almost as long as the planet.
The inner core of the earth, on the other hand, is a relatively new achievement: it only formed 565 million years ago, as shown by research by Tarduno and his colleagues earlier this year.
While researchers initially believed that the early magnetic field of Earth was low intensity, the new zircon data showed a stronger field.
However, because the inner core has not yet been formed, the strong field that was originally developed 4 billion years ago must be driven by other mechanisms.
Magnesium oxide may be released from the extreme heat associated with the large impacts that make up the Earth’s moon. When it cools the inside of the earth, magnesium oxide can fail through convection and geodynamics.
Researchers believe that the inside of the earth has depleted a source of magnesium oxide so that the magnetic field almost completely collapsed 565 million years ago.
However, the formation of the inner core provides a new source of strength for the current geodynamic and planetary magnetic shields that the Earth has.
This initial magnetic field was very important because it protected the atmosphere and drained water from the ancient earth when the solar wind was strongest.
The mechanism of field generation is almost certainly important for other bodies such as other planets and extrasolar planets.
For example, a leading theory says that Mars, like Earth, had a magnetic field at the beginning of its history. But on Mars, the field collapses and, unlike Earth, Mars does not create new ones.
After losing its magnetic shield, Mars loses its water.
But we still don’t know why the magnetic shield is broken. The initial magnetic shield is very important, but we are also interested in the stability of the magnetic field.
This study gives us more data to understand the processes that support Earth’s magnetic shield.