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Related Experiment Video

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Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Common solution to the cosmic ray anisotropy and gradient problems.

Carmelo Evoli¹, Daniele Gaggero, Dario Grasso

¹INFN Pisa and Pisa University, Pisa, Italy. carmelo.evoli@desy.de

Physical Review Letters

|September 26, 2012

Summary

Conventional cosmic ray models fail to explain observations. A new model links cosmic ray escape time to magnetic turbulence, successfully explaining cosmic ray spectra, anisotropy, and gamma-ray emissions.

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Area of Science:

Astrophysics
Cosmic Ray Physics
High-Energy Astrophysics

Background:

Conventional models struggle to reconcile multichannel cosmic ray spectra with large-scale anisotropy.
Existing models face challenges explaining gamma-ray interstellar emission, including longitude distribution and radial emissivity gradients.

Purpose of the Study:

To propose and validate a new cosmic ray propagation model.
To address the incompatibility between cosmic ray spectra, anisotropy, and gamma-ray emission data.

Main Methods:

Developing a physically motivated correlation between cosmic ray escape time and spatially dependent magnetic turbulence power.
Implementing this correlation within propagation models.
Comparing model predictions with observational data from cosmic ray spectra, anisotropy, and Fermi-LAT gamma-ray measurements.

Main Results:

The proposed model successfully fits a wide range of cosmic ray spectra.
The model consistently reproduces cosmic ray anisotropy in the 10^2-10^4 GeV energy range.
The model accurately replicates the gamma-ray longitude distribution observed by Fermi-LAT.

Conclusions:

A correlation between cosmic ray escape time and magnetic turbulence offers a viable solution to discrepancies in current models.
This approach naturally resolves issues with cosmic ray spectra, anisotropy, and Galactic gamma-ray emission.
The findings provide a more comprehensive understanding of cosmic ray propagation in the galaxy.