south atlantic anomaly: study reveals magnetic pole ‘wobble’ has been growing for 1000 years
The Southern Lights spread and twinkle in Tasman\'s sky. Credit — The South Atlantic Anomaly is the weakest region of the Earth\'s magnetic field. Image: Cnes/CLSSource: the gap in Earth defense is getting bigger and bigger. For more than a century, we know that the Earth\'s magnetic field has been weakening. It gives us the north and south poles. This is our compass. It is also an important barrier to protect us from the constant bombing of our harmful radiation from the sun or deep space. This weakening is most evident in one place. This is a hole across the heart of South America, the South Atlantic and Africa. It is called the \"South Atlantic Anomaly \". It allows higher Energy radiation penetrates deeper through the near-orbit, the atmosphere, and our surface. In recent decades, it has led to the crash of the shuttle and computers on the International Space Station. Hitomi X of the 2016 Japanese Revolution- Ray observation satellites, which were supposed to study black holes and superstars, were hit as they crossed the gap, causing rotation to spin out of control. A new study published in the Journal of Science, Geophysical Research Express, has been digging in time to find out how long this anomaly has been active in the region What does this mean for our future. This style of grain bins used in Africa centuries ago, burnt remains provide a window for the time magnetic field. Image: John Tarduno/cc- NDSource: Professor John tardono, a physicist at the University of Rochester, worked with archaeologists to study the charred remains of grain silos left by some of the world\'s oldest farmers. This ancient man lived in the limbo Valley. Borders Zimbabwe, South Africa and Botswana. Baking in clay is a snapshot of the magnetic field at that time. When heated, the clay releases magnetic minerals. These — Like a compass. Then align with the Earth\'s magnetic field. These will be frozen in place when the clay cools down. It\'s all because of an old cleaning ceremony. Professor Tarduno said, explore more: How humans survived the super volcano \"the Bantu people who currently live there, they are the first to engage in agriculture. \"So, in times of drought, you can imagine that it\'s quite stressful for the population. According to archaeologists, they carried out a ritual burn. They will actually burn down their village and start over. The record they left us proved that. The changes and swirls of the region\'s magnetic fields have taken shape for more than a thousand years. \"We think we \'ve seen a few episodes similar to what happened today -- This is from outside Africa, the magnetic field is operating abnormally . \" Professor Tarduno said. On the left is the Earth\'s magnetic field we are used. On the right, a model of what the magnetic field might look like during the reversal process. NASA/Gary Glazmaier, CC by source: Geologists believe that the core of matter is the disturbance of the outer core of the Earth ( Below surface 2900 km). The magnetic field is generated by this overheated molten metal pool. \"If we look at our best numerical simulation of the magnetic field reversal, this is the type of pattern we see before the reversal,\" Professor Tarduno said . \". \"We don\'t know the current (anomaly) Will lead to a full reversal. \"Explore more: if the anomaly continues to grow, how NASA hopes to save us from killer asteroids Orbit and our planet will become more and more vulnerable to harmful light and solar storms. The last polar reversal on Earth was about 780,000 years ago. It experienced a dramatic \"shake\" about 40,000 years ago, but did not completely capsize. But this process takes thousands of years to unfold. This is very fast in geology. This photo was taken by Doris instruments. Aboard a satellite called Jason. 1. Image: Cnes/CLSSource: providing \"we already know that the magnetic field has been changing all the time, but, we don\'t really know if this is unusual for this area in a longer time frame, I don\'t know if this is normal, \"said Dr. Vincent Hale, a physicist at the University of Rochester. The burnt- Clay hut reveals a similar drop in the magnetic field of about 400-450 BC, 700- 750 BC and 1225-1550 BC. This means that the current weakness has been developing for some time. \"We got stronger evidence that there was something unusual at the core -- This may have an important impact on the global magnetic field, \"said Professor Tarduno. \"We now know that this unusual behavior has happened at least a few times before the last 160 and is part of a larger long-term behavior -- \"The terminology model,\" said Dr. Hare. \"However, it is too early to determine whether this behavior will lead to a complete pole reversal.