If we look back on this day in history, it marks the birth anniversary of Hans Christian Ørsted. He was a Danish physicist and chemist born on 14th August 1977 who formed the foundation of electromagnetism.
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| A portrait of Hans Christian Ørsted by Christian Albrecht Jensen (1842). Source: Wikipedia |
The presence of an electric current deflects a compass needle was the starting point of this discovery. Now, we apply it to objects as big and far away as the planets and space. Much of what the IAGA community does is based on the interaction of electric and magnetic fields.
In his honour, Ørsted (Oe) is the unit of magnetic field strength in the CGS (centimeter-gram-second) system of units. The first Danish satellite was also named after him. The Ørsted satellite launched in 1999 provided magnetic field data around Earth. Many geomagnetic field models make use of this data even today.
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