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SUMMARY:Kinetic Alfvén Eigenmodes and Earth’s Radiation Belts
DTSTART:20180614T103000
DTEND:20180614T113000
DTSTAMP:20260510T131447Z
UID:38e772bba2dc7e78997bd44cc4d12322c658abc7f0f9d2c375e97a56
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. C. Chaston\, Space Sciences Laboratory\, University of Cal
 ifornia\, Berkeley\, USA\nThe Earth’s radiation belts pose an existentia
 l risk to spacecraft. A critical consideration for the design and operatio
 n of an ever-increasing number satellites and future manned spaceflight mi
 ssions is the mediation of this risk. This is complicated by extreme radia
 tion belt variability during geomagnetically active times. Understanding t
 he drivers of this variability is therefore desirable yet existing physica
 l mechanisms proposed to account for this variability are often insufficie
 nt to explain the rapid rates of change observed. Recent observations from
  NASA’s Van Allen Probes spacecraft have facilitated major advances in u
 nderstanding this variability including the discovery of kinetic Alfvén e
 igenmodes in the inner magnetosphere. These modes\, well known in tokamaks
 \, are found to pervade the outer radiation belt during space weather even
 ts and in particular throughout those intervals where the most dramatic ch
 anges in the radiation belts occur. They are observed with the largest amp
 litudes of any waves observed in Earth’s magnetosphere. In this presenta
 tion we describe the properties of these eigenmodes and demonstrate how th
 ey act to drive the transport and energization of relativistic electrons. 
 It is shown that through drift-bounces resonances and scattering these mod
 es can drive variation in radiation belt electron fluxes at rates an order
  of magnitude larger than existing mechanisms and perhaps account for the 
 enigmatic variability observed.\n 
LOCATION:ppb 019
STATUS:CONFIRMED
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