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Distributed reacceleration of cosmic rays.

A Wandel1, D Eichler, J R Letaw

  • 1University of Maryland, USA.

The Astrophysical Journal
|May 15, 1987
PubMed
Summary
This summary is machine-generated.

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This study introduces a new cosmic ray propagation model with continuous reacceleration, successfully reproducing the boron-to-carbon ratio and explaining various cosmic ray data anomalies.

Area of Science:

  • Astrophysics
  • Cosmic Ray Physics
  • Particle Acceleration

Background:

  • Cosmic rays (CRs) are high-energy particles originating from outer space.
  • Understanding CR propagation and origin is crucial for astrophysics.
  • Existing models like the leaky box model have limitations in explaining observed CR data.

Purpose of the Study:

  • To develop and analyze a new cosmic ray propagation model incorporating continuous reacceleration.
  • To investigate the impact of distributed reacceleration on cosmic ray spectra and abundance ratios.
  • To explain observed anomalies in cosmic ray data, such as the boron-to-carbon ratio and isotopic abundances.

Main Methods:

  • Analytical and numerical solutions for cosmic ray acceleration and propagation equations.
Keywords:
NASA Discipline Radiation HealthNon-NASA Center

Related Experiment Videos

  • Approximation of ionization losses by a cutoff.
  • Comparison of model predictions with observational data, including boron-to-carbon ratio and CRNE data.

    • Main Results:

    • The model successfully reproduces the observed boron-to-carbon ratio across a range of escape parameters.
    • Distributed reacceleration explains the leveling off of the boron-to-carbon ratio at high energies.
    • The model naturally explains several observed anomalies, including pathlength distribution truncation and isotopic anomalies.

    Conclusions:

    • Continuous reacceleration provides a viable alternative to standard cosmic ray propagation models.
    • The proposed model offers a unified explanation for diverse cosmic ray observations.
    • Further investigation into distributed reacceleration can refine our understanding of cosmic ray origins and galactic propagation.