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al2207
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how can i find data for Earth magnetism for the period 30,000 years to today, is it possible to control magnetism forces
thanks
thanks
http://www.ngdc.noaa.gov/geomag/paleo.shtmlal2207 said:data for Earth magnetism for the period 30,000 years to today,
thanks do you have another place i had difficulty to see/download documentBystander said:
mostly variation of Earth magnetic field during that periodBystander said:What sort of data are you seeking? Polar wandering? Variations in field strength? Orientation in recent sediments?
Thank you for confirming my suspicions.geo101 said:On a practical note. South America is a relatively poorly sampled region for paleomagnetism
Paleomagnetism is the study of the Earth's magnetic field in the past. The Earth's magnetic field is generated by the movement of molten iron in the outer core. When this molten iron cools and solidifies, it preserves the direction and strength of the Earth's magnetic field at that time. By studying the magnetic properties of rocks and sediments, we can reconstruct the Earth's magnetic field in the past.
By analyzing the magnetic properties of rocks and sediments from different time periods, we can create a record of changes in the Earth's magnetic field. This allows us to track the movement of the Earth's magnetic poles, as well as changes in the strength and direction of the magnetic field. It also provides insight into the processes that drive these changes over time.
The Earth's magnetic field is closely linked to the Earth's climate, as it helps to shield the planet from solar winds and cosmic radiation. By studying changes in the Earth's magnetic field, we can also infer changes in the Earth's climate. For example, during times of low magnetic field strength, there is an increase in the amount of cosmic radiation reaching the Earth's surface, which can affect the formation of certain types of rocks and sediments.
Paleomagnetism can provide information about the Earth's magnetic field as far back as the formation of the oldest rocks on Earth, which are approximately 4 billion years old. However, the further back in time we go, the less detailed the record becomes, as rocks and sediments can be altered or destroyed over time.
Studying paleomagnetism allows us to create a timeline of changes in the Earth's magnetic field, which can be used to correlate and date different rock formations and geological events. This helps us understand the movement and formation of continents, as well as the timing of major geological events such as volcanic eruptions and mass extinctions.