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SUMMARY:Severe Space Weather - Professor	Richard Horne FRS\, British Antar
 ctic Survey
DTSTART:20211116T193000Z
DTEND:20211116T204500Z
UID:TALK163111@talks.cam.ac.uk
CONTACT:Xuchen Wang
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 and cause a geomagnetic storm whic
 h can last for days.  The Sun can also emit intense radiation from solar f
 lares and drive radiation storms where high energy particles penetrate the
  Earth’s magnetic field\, particularly in the Polar Regions.  In this ta
 lk we first describe some of the historical origins of space weather inclu
 ding the Carrington storm of 1859.  We describe how space weather can affe
 ct the power grid causing disruption to power supplies\, pose a radiation 
 risk to aviation\, damage satellites\, interrupt communications and GPS si
 gnals\, delay rocket launches and increase the risk of collisions between 
 satellites and space debris in low Earth orbit.  We discuss some of the un
 certainty over the economic impact and what mitigation measures can be tak
 en.  Finally\, we discuss some of the challenges around forecasting space 
 weather now and into the future and a new prototype forecasting system dev
 eloped at the British Antarctic Survey.
LOCATION:Pfizer Lecture Theatre\, Department of Chemistry
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