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Earth's magnetic field measured using artificial stars
short by Mahi Chauhan / on Saturday, 17 November, 2018
A team of international scientists has measured the Earth's magnetic field using laser-generated artificial stars at an altitude of 90 kilometres. They were used to determine the Earth's magnetic field in the sodium layer of the atmosphere. The beam, directed into the atmosphere, strikes sodium atoms which absorb the energy of the laser and start to glow, the team said.
read more at Phys