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Aurora
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=== Other auroral radiation === In addition, the aurora and associated currents produce a strong radio emission around 150 kHz known as [[auroral kilometric radiation]] (AKR), discovered in 1972.<ref>{{cite journal|last1=Gurnett|first1=D.A.|title=The Earth as a radio source|journal=Journal of Geophysical Research|year=1974|volume=79|issue=28|page=4227|bibcode=1974JGR....79.4227G|doi=10.1029/JA079i028p04227 }}</ref> [[Ionospheric absorption]] makes AKR only observable from space. X-ray emissions, originating from the particles associated with auroras, have also been detected.<ref>{{cite journal|last1=Anderson|first1=K. A.|title=Balloon observations of X-rays in the auroral zone|journal=Journal of Geophysical Research|year=1960|volume=65|issue=2|pages=551β564|doi=10.1029/jz065i002p00551|bibcode=1960JGR....65..551A }}</ref>
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