On the possible acceleration and temporary confinement of energetic ions in the distant heliosphere

I. S. Veselovsky, Yu I. Logachev, K. Kecskeméty, P. Kiraly, M. A. Zeldovich

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Theoretical aspects of the energetic ion motions in the magnetic dip between travelling heliospheric magnetic field perturbations and the termination boundaries of the heliosphere are considered. The group of ions under appropriate initial conditions perform here several bouncing oscillations and could be accelerated along the strongly inclined magnetic fields pointed nearly perpendicular to the radial direction. Accelerating ions are partially confined between the converging magnetic mirrors at the periphery of the heliosphere before escaping in the interstellar medium. We develop a tentative model of these Fermi-type processes which might be useful for the interpretation of recent Voyager 1, 2 observations. The model is capable to reproduce qualitatively the following observed features: (1) the reappearance of MeV proton increases several times during 2000-2004 at both spacecraft because of the solar and heliospheric magnetic field "breathing" due to variations of the solar activity; (2) the time delays between corresponding Voyager 1 and Voyager 2 increases for 3-4 months due to the solar wind propagation; (3) the moderate anisotropy of MeV ion fluxes directed mainly along the magnetic field spirals away from the Sun; (4) the possibility of stronger increases of MeV fluxes at larger heliospheric distances, as was observed in 2003 and 2004, due to the combination of the local acceleration, partial trapping and propagation effects in the variable electric and magnetic fields.

Original languageEnglish
Pages (from-to)1433-1438
Number of pages6
JournalAdvances in Space Research
Volume37
Issue number8
DOIs
Publication statusPublished - 2006

Fingerprint

heliosphere
energetics
Magnetic fields
magnetic field
ion
Ions
magnetic fields
ions
Magnetic mirrors
Fluxes
magnetic mirrors
ion motion
Solar wind
propagation
breathing
solar activity
Sun
solar wind
trapping
Spacecraft

Keywords

  • Acceleration
  • Energetic particles
  • Heliosphere
  • Local interstellar medium
  • Trapping

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

On the possible acceleration and temporary confinement of energetic ions in the distant heliosphere. / Veselovsky, I. S.; Logachev, Yu I.; Kecskeméty, K.; Kiraly, P.; Zeldovich, M. A.

In: Advances in Space Research, Vol. 37, No. 8, 2006, p. 1433-1438.

Research output: Contribution to journalArticle

Veselovsky, I. S. ; Logachev, Yu I. ; Kecskeméty, K. ; Kiraly, P. ; Zeldovich, M. A. / On the possible acceleration and temporary confinement of energetic ions in the distant heliosphere. In: Advances in Space Research. 2006 ; Vol. 37, No. 8. pp. 1433-1438.
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AU - Zeldovich, M. A.

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