The magnetic field of the earth was once like a flower there are not only two poles — science and t-sunny came home

The magnetic field of the earth was like a flower: more than two poles — science and technology — people.com.cn original title: the earth’s magnetic field was like a flower: more than two poles of the earth’s magnetic field is not always a kind of long – stand second according to the Washington Carnegie Institute of Science in Peter? Driscoll’s newly discovered, in the distant past, with the earth’s magnetic field and today, the earth’s magnetic field and look as like as chalk and cheese, it has more than two poles. In the latest issue of "Geophysical Research Letters", Driscoll studied the effect of magnetic field on solidification of the core, he used the model of the earth’s history made a surprising discovery: This is what we call a "home" of the world not only the north and South poles. In fact, he said in a statement, and we previously believed, these simulations show that the earth’s magnetic field has a surprising number of fluctuations, the earth does not always maintain a stable magnetic field. He added that in the process of solidification of the core, the earth may change from "double pole world" in order to have between multiple poles of sharp fluctuations in the weak magnetic field, and finally back to the double pole world as we know it today "". "These findings may be abnormal fluctuations in the geological record in 6 to 700 million years ago in the direction of the magnetic field to provide a explanation," he pointed out, "so in ancient times affect the dramatic changes in the magnetic field is very wide." How does this happen and what does it mean? As Driscoll and Carnegie Research Institute explained, the earth had a strong magnetic field from a core extends to the outer space. The magnetic field can protect the earth’s atmosphere and deflect energetic particles from the sun and other parts of the solar system, which could be harmful to living organisms if they allow them to hit the ground. The earth’s magnetic field is created by a "dynamo" phenomenon, which includes the movement of liquid iron from the outer earth and the solidification of the earth’s core because of heat loss. However, the earth’s core is not always solidified, then the question arises: what effect does the earth’s core solidification have on the planet’s magnetic field? To answer this question, Driscoll built a model of the earth’s thermal history dating back 4 billion 500 million years. His model shows that the core may be started 650 million years ago in solidification, so he made additional simulations to look for this period of the earth’s magnetic field changes, and was found in 1 billion years ago, the earth’s magnetic field may be similar to the modern transformation for a different form. The modern form of the magnetic field has a strong magnetic field and the two poles of the north and the south, but the magnetic field becomes weak after the transition, and undergoes a series of natural fluctuations in intensity and direction. During this period, the magnetic field may be derived from a number of different poles. Then, the passage of time, the core solidifies, double pole magnetic field according to the prediction of magnetic field model and back to the "strong" "". "These findings, in short, are of great significance to the history of the earth’s thermal magnetism," the Institute claims, "especially in the field of using the magnetic field to reconstruct the movements of the ancient world and the ancient climate. Driscoll will be in the future and the simulation model and the magnet)相关的主题文章: