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Northern Lights Aurora Borealis
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=Zcef943eoiQ
As well as the visible green or red glow of the Aurora Borealis (or Northern Lights), there is also created an intense radio emission that can be converted to sound. • Professor Carolin Crawford here explains the phenomena and introduces us to that sound of the Aurora Borealis. • • The Aurora Borealis is created by solar wind hitting the earth's atmosphere. The charged particles of the solar wind are normally deflected away by the shield of Earth's magnetic field, but some are able to leak into the magnetosphere around the earth, where they are then guided along Earth's magnetic field to reach deeper into the atmosphere. Here they collide with the oxygen and nitrogen molecules of the air, to produce a luminous green and red glow that is the aurorae (Northern or Southern lights). • These moving charged particles that create the northern lights also produce intense radio emission at very low frequencies. We can 'hear' the aurorae as a busy chatter when these radio signals are converted to sound, varying on the real timescale that you can hear. • • This is an extract from a lecture by Carolin Crawford, Gresham Professor of Astronomy: 'The Sounds of the Universe'. • The transcript and downloadable versions of the lecture are available from the Gresham College website: • http://www.gresham.ac.uk/lectures-and... • Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/
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