Particle acceleration at a blunt termination shock

N. A. Schwadron, D. J. McComas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Voyager 1's recent and long anticipated passage into the heliosheath contradicted the prediction that we would observe the source of anomalous cosmic rays (ACRs) accelerated at the termination shock (TS). McComas and Schwadron suggested a simple resolution to this paradox. Because of the TS's blunt structure, the azimuthal magnetic field lines frozen into the solar wind first make contact with the TS at its nose where ions have very little time to be accelerated prior to being swept toward the shock's flanks. Ions achieve high ACR energies not near the nose, but off on the flanks of the termination shock. Here, we describe an important consequence that follows naturally from this scenario concerning the modulation of ACRs. ACRs are produced on the flanks of the termination shock, which are beyond Voyager. Thus, fluctuations caused by modulation of ACRs should be correlated with GCR fluctuations because both populations must drift in against the modulating effects of solar wind in the heliosheath. McDonald et al. [this volume] show striking evidence of this correlation, demonstrating clearly that the ACR source should be beyond Voyager.

Original languageEnglish (US)
Title of host publicationPHYSICS OF THE INNER HELIOSHEATH
Subtitle of host publicationVoyager Observations, Theory, and Future Prospects; 5th Annual IGPP International Astrophysics Conference
Pages165-170
Number of pages6
StatePublished - Dec 1 2006
Externally publishedYes
EventPHYSICS OF THE INNER HELIOSHEATH: Voyager Observations, Theory, and Future Prospects; 5th Annual IGPP International Astrophysics Conference - Oahu, HI, United States
Duration: Mar 3 2006Mar 9 2006

Publication series

NameAIP Conference Proceedings
Volume858
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferencePHYSICS OF THE INNER HELIOSHEATH: Voyager Observations, Theory, and Future Prospects; 5th Annual IGPP International Astrophysics Conference
CountryUnited States
CityOahu, HI
Period3/3/063/9/06

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

Keywords

  • Diffusive shock acceleration
  • Energetic particles
  • Termination shock

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