7R OLJKWQLQJ %HQMDPLQ )UDQNOLQ URG ULQJHU …€¦ · 02 10 12 UNIVERSAL TIME Carnegie Curve 22...
Transcript of 7R OLJKWQLQJ %HQMDPLQ )UDQNOLQ URG ULQJHU …€¦ · 02 10 12 UNIVERSAL TIME Carnegie Curve 22...
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Franklin chimes
grounded
To lightning rod
ringer
Benjamin Franklin
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• Ben Franklin proposed Sentry Box experiment in 1750
• D’Alibard demonstrated Sentry Box by ‘drawing fire from clouds’ in 1752 (Franklin became famous as a result)
• At about the same time (1752) Lemmonier discovered Fair Weather Electricity
• Linss 1788: Fundamental Problem of Atmospheric Electricity: Why is there a continuous current from the air to the ground?
• (note: ions not discovered until Elster&Greitel 1899)
• Victor Hess discovered Cosmic Rays in 1911
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Electric Field
ConductivityJ = σE is constant in altitude
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Global Electric Circuit
First proposed by C.T. R Wilson
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Two payloads see same field even though separated by over 1000 km ! So, conclusion is that this variation is planetary-scale sized.
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Next time:
http://www.youtube.com/watch?v=9v-4IiqPhnU
Lightning Safety:http://www.srh.noaa.gov/jetstream/lightning/lightning_faq.htm
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