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SUMMARY:Space Weather and Satellites - Dr. Richard Horne\, British Antarct
 ic Survey
DTSTART:20170412T180000Z
DTEND:20170412T193000Z
UID:TALK67213@talks.cam.ac.uk
CONTACT:Andrew Clarke
DESCRIPTION:Large explosions on the Sun can expel billions of tons of char
 ged particles and magnetic field out into space in what is known as a coro
 nal mass ejection.  When this plasma encounter’s the Earth’s magnetic 
 field it can tear open the outer layers of the field and cause a geomagnet
 ic storm which can last for days.  Magnetic storms can cause disruption to
  power supplies\, satellites\, positioning and timing signals\, aviation a
 nd a host of other businesses.  Here we describe what happens to the Earth
 ’s radiation belts and how they present an enhanced risk of radiation da
 mage to satellites.  The radiation belts consist of high energy (relativis
 tic) electrons and ions trapped inside the Earth’s external magnetic fie
 ld and which circulate round the Earth on a period of tens of minutes. The
  science problem is to understand how the particles are accelerated\, and 
 what causes the variability.  We show how the original ideas on how the ra
 diation belts are formed have been changed by new research and discuss the
  two leading acceleration processes\, acceleration by very low frequency r
 adio waves\, and acceleration by radial transport.  We describe a new syst
 em that has been developed in the EU SPACECAST and the SPACESTORM projects
  to forecast radiation levels throughout the radiation belts and assess th
 e risk to satellites on orbit.  Finally\, we show how electron acceleratio
 n by very low frequency radio waves could be a major process for forming t
 he radiation belts at Jupiter and Saturn.
LOCATION:Schlumberger Cambridge Research\, High Cross\, Madingley Road\, C
 B3 0EL
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