1859: British astronomer Richard Carrington observed a powerful solar flare, and within a day telegraph systems worldwide went haywire while auroras appeared near the equator—the Carrington Event, the largest geomagnetic storm on record. During the 1957–58 International Geophysical Year, Explorer-1 became the first U.S. satellite to discover the Van Allen radiation belts encircling Earth. SOHO,…
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SOHO (Solar and Heliospheric Observatory), launched in 1995, became the first satellite to continuously observe the Sun from the Sun–Earth L1 point and carries the LASCO coronagraph, enabling CME tracking and the discovery of more than 5,000 comets. ACE (Advanced Composition Explorer), launched in 1997, and NOAA’s DSCOVR (Deep Space Climate Observatory), launched in 2015,…
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