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SUMMARY:Chaos and the Anisotropy of Cosmic Rays - Vanessa López-Barquero
DTSTART:20211103T134500Z
DTEND:20211103T141500Z
UID:TALK165322@talks.cam.ac.uk
CONTACT:Francisco Paz-C
DESCRIPTION:Cosmic rays (CRs) are detected on Earth with an energy-depende
 nt anisotropy on their arrival direction. The question of the origin of co
 smic rays is inextricably connected to this anisotropy. As CRs travel in t
 he Galaxy\, they can be trapped momentarily in coherent magnetic structure
 s present in the interstellar medium\, which can induce chaotic behavior i
 n their trajectories. This process intrinsically alters their motion so th
 at it will not be merely diffusive. In this work\, we develop a new method
  to characterize chaotic trajectories in bound systems. This method is bas
 ed on the Finite-Time Lyapunov Exponent (FTLE)\, which determines the degr
 ee of chaos in the particles' trajectories. Furthermore\, we model a coher
 ent magnetic structure with time-perturbations that can be used to describ
 e distinct magnetic systems and basic processes. Our results show that the
  FTLE\, i.e.\, the level of chaos\, is related to the CRs escape time from
  the system by a power-law relation. Additionally\, this power law persist
 s even if perturbations act on the system\, pointing to the idea that this
  specific power law could be an essential parameter of the system. We also
  find that CRs can be divided into different categories according to their
  chaotic behavior. Moreover\, these categories are distributed in specific
  regions in the arrival distribution maps. Therefore\, this result can pro
 vide the basis for time-variability in the CR arrival direction maps.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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