Classifier Instance:

Anchor text: De Magnete
Target Entity: De_Magnete
Preceding Context: For centuries, people have noticed the aurora, which is caused by space weather, but did not understand it. Navigators in the Medieval Ages in Europe using a lodestone as a magnetic compass noted that occasionally the stone's direction was deflected from magnetic north. This was described in 1600 in
Succeeding Context: but was not understood to be caused by space weather until the 19th century. Space weather affected the first electrical telegraphs in the 1840 in various areas at various times. The great solar storm of 1859 disrupted telegraph operations around the world, causing articles to be published in many major newspapers at that time. Richard Carrington correctly connected the disruption with a solar flare observed the day before and a great deflection of the Earth's magnetic field (or geomagnetic storm) simultaneous with the telegraph disruption. With this connection, space weather, as we now know it, became a subject of academic research within the study of solar physics. Kristian Birkeland explained the physics of aurora by creating artificial aurora in his laboratory and predicted the solar wind. With the introduction of radio for commercial and military uses, it was noted that periods of extreme static or noise occurred. Severe radar jamming during a large solar event in 1942 led to the discovery of solar radio bursts (radio waves which cover a broad frequency range created by a solar flare), another aspect of space weather.
Paragraph Title: History of the concept
Source Page: Space weather

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