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The magnetic field of Mars is the magnetic field generated from Mars 's interior. Today, Mars does not have a global magnetic field. However, Mars did power an early dynamo that produced a strong magnetic field 4 billion years ago, comparable to Earth's present surface field.
The Earth is the only one of the rocky planets in our Solar System to have a strong magnetic field. Its presence is likely one of the major reasons why Mars and Earth are so vastly different. But billions of years ago, Mars too had a strong magnetic field.
Scientists working with the MGS hope that by mapping these anomalies they can learn about the extinct magnetic core or dynamo within Mars and about Mars' surface evolution. Want to learn more about magnetism and magnetospheres?
A new paper in Nature Communications makes their most compelling case to date that Mars’ life-enabling magnetic field could have survived until about 3.9 billion years ago, compared with previous estimates of 4.1 billion years — so hundreds of millions of years more recently.
Now, fragments from a famous martian meteorite, studied with a new kind of quantum microscope, have yielded evidence that the planet’s field persisted until 3.9 billion years ago, hundreds of millions of years longer than many had thought.
Mars has a weak remnant of a magnetic field emanating from its crust, but it’s a feeble phenomenon that provides little protection. The loss of its magnetosphere was catastrophic for Mars.
Mars’ magnetic field has been measured at large scale by orbiting spacecraft and at very small scale via Martian meteorites. Here we report on a ground magnetic survey on metre to kilometre...