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Title: Upstream turbulence and the particle spectrum at CME-driven Shocks

Abstract

Particle spectra at a CME-driven shock often exhibit a power law to certain energies, then roll over exponentially beyond. However, there are cases where a spectrum evolves to another power law above a certain energy (e.g. the Oct. 29th, 2003 event). Here we introduce an effective 'loss term' into the particle transport equation and study the consequent particle spectra behavior at a CME-driven shock. The loss term represents the effect of particle leaking out from a finite shock and is related to the turbulence power at and near the shock. We show that the shape of particle spectra are tightly related to the form of upstream turbulence. Under certain circumstances, broken power-law spectrum can be obtained. The physical meaning of the 'loss term' and its relationship to the upstream turbulence is discussed.

Authors:
; ;  [1]
  1. Institute of Geophysics and Planetary Physics, University of California Riverside, Riverside CA 92521 (United States)
Publication Date:
OSTI Identifier:
20719186
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 781; Journal Issue: 1; Conference: 4. annual IGPP international astrophysics conference, Palm Springs, CA (United States), 26 Feb - 3 Mar 2005; Other Information: DOI: 10.1063/1.2032702; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHARGED-PARTICLE TRANSPORT THEORY; ENERGY SPECTRA; SHOCK WAVES; SOLAR CORONA; TURBULENCE

Citation Formats

Gang, Li, Hu, Q, and Zank, G P. Upstream turbulence and the particle spectrum at CME-driven Shocks. United States: N. p., 2005. Web. doi:10.1063/1.2032702.
Gang, Li, Hu, Q, & Zank, G P. Upstream turbulence and the particle spectrum at CME-driven Shocks. United States. https://doi.org/10.1063/1.2032702
Gang, Li, Hu, Q, and Zank, G P. 2005. "Upstream turbulence and the particle spectrum at CME-driven Shocks". United States. https://doi.org/10.1063/1.2032702.
@article{osti_20719186,
title = {Upstream turbulence and the particle spectrum at CME-driven Shocks},
author = {Gang, Li and Hu, Q and Zank, G P},
abstractNote = {Particle spectra at a CME-driven shock often exhibit a power law to certain energies, then roll over exponentially beyond. However, there are cases where a spectrum evolves to another power law above a certain energy (e.g. the Oct. 29th, 2003 event). Here we introduce an effective 'loss term' into the particle transport equation and study the consequent particle spectra behavior at a CME-driven shock. The loss term represents the effect of particle leaking out from a finite shock and is related to the turbulence power at and near the shock. We show that the shape of particle spectra are tightly related to the form of upstream turbulence. Under certain circumstances, broken power-law spectrum can be obtained. The physical meaning of the 'loss term' and its relationship to the upstream turbulence is discussed.},
doi = {10.1063/1.2032702},
url = {https://www.osti.gov/biblio/20719186}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 781,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2005},
month = {Mon Aug 01 00:00:00 EDT 2005}
}