Mysterious Magnetic Pulses on Mars

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It was though that Mars had no significant global magnetic field, but NASA’s InSight Mars Lander has measured the crustal field to be 20x stronger than expected from orbital measurements. Moreover, the magnetic field seems to fluctuate in direction or strength at exactly midnight (that is Mars Lander’s midnight on Mars, not ours).
The Lander has also detected an unexpected electrically conductive layer about 2.5 miles thick, way below the surface (possibly an aquifer?). All this since its landing in November 2018.

National Geographic article