Scientists have discovered a new method of studying the evolution of Earth’s magnetic field by using over three thousand-year-old bricks from Mesopotamia. This research can help in better understanding the current and future behavior of our planet’s magnetic field.
Earth’s magnetic field is a protective shield that safeguards our planet from solar wind and cosmic radiation. The most popular theory regarding its formation, known as the dynamo theory, suggests that the magnetic field is generated by currents and swirling masses of molten iron in the Earth’s core. However, Earth’s magnetic field is dynamic and changes over time.
Researchers employ various methods to reconstruct changes in the magnetic field. In this case, scientists focused on studying bricks from Mesopotamia. 32 clay bricks were carefully examined to investigate the arrangement of microscopic grains of iron oxide within their structure. This allowed researchers to determine a broad reconstruction of the magnetic field over a span of approximately 2000 years, from the 3rd to the 1st millennium BCE. This innovative approach enables absolute dating using archaeomagnetism, which allows the study of ancient artifacts that lack organic material for traditional dating.
The research results confirmed the existence of a magnetic anomaly in the areas of present-day Iraq at that time. The Earth’s magnetic field was strong between 1050-550 BCE. The analysis also revealed that magnetic fields fluctuate in a short period, as shown by variations between 604 and 562 BCE during the reign of Nebuchadnezzar II.
This discovery provides an unprecedented opportunity to study changes in the magnetic field in high temporal resolution. It is important for a better understanding of how Earth’s magnetic field changes and how these changes can impact our planet.
FAQ:
1. What are the methods for reconstructing Earth’s magnetic field?
Scientists utilize various methods for reconstructing Earth’s magnetic field, such as analyzing rock and mineral samples, measuring microscopic grains of iron oxide, and studying ancient artifacts.
2. Why is studying Earth’s magnetic field important?
Studying Earth’s magnetic field is significant because it helps us comprehend the protection it provides against solar wind and cosmic radiation, as well as how these changes may affect our planet in the future.
3. How does studying Mesopotamian bricks assist in the reconstruction of Earth’s magnetic field?
Studying Mesopotamian bricks allows for a broad reconstruction of the magnetic field over many centuries. Researchers examine the arrangement of microscopic grains of iron oxide within the bricks’ structure, which helps determine changes in the magnetic field over a longer time perspective.
Source: Proceedings of the National Academy of Sciences
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