United States Antarctic Programme, National Science Foundation (NSF)
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Polarlicht auf Antarktika, auch Aurora australis genannt: Polarlicht ist eine Leuchterscheinung durch angeregte Stickstoff- und Sauerstoffatome der Hochatmosphäre. Polarlichter sind meistens in etwa 3 bis 6 Breitengrade umfassenden Bändern in der Nähe der Magnetpole zu sehen. Hervorgerufen werden sie durch energiereiche geladene Teilchen - der Sonnenwind, ein Plasma mit einer Dichte von ca. 5 Teilchen/cm³ und einer durchschnittlichen Geschwindigkeit von 500 bis 800 km/s.
© Dr. Keith Vanderlinde => Zurück zum Artikel