Polar cap aurorae tell the time

North of ∼75 degrees magnetic latitude, deep within the polar cap, auroral forms oriented in the Sun-Earth direction have long been observed. However, it was not until the 1980s that the improved sensitivity of our optical instruments showed that such auroral forms are present about half the time, w...

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Veröffentlicht in:	Endeavour (New series) 1995-01, Vol.19 (3), p.107-111
Hauptverfasser:	Egeland, Alv, Fukui, Katsura
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Atmosphere Earth sciences Geography Geophysics. Oceanography. Navigation History of science and technology Radiation Sun Time
Online-Zugang:	Volltext
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