ANISOTROPIC THREE-DIMENSIONAL FOCUSED TRANSPORT OF SOLAR ENERGETIC PARTICLES IN THE INNER HELIOSPHERE

Journal Article · Mon Feb 01 04:00:00 EST 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/709/2/912· OSTI ID:21392270

Droege, W ^[1]; Kartavykh, Y Y; Kovaltsov, G A ^[2]; Klecker, B ^[3]

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1. Institut fuer Theoretische Physik und Astrophysik, Universitaet Wuerzburg, 97074 Wuerzburg (Germany)
2. Ioffe Physical-Technical Institute, St. Petersburg 194021 (Russian Federation)
3. Max-Planck-Institut fuer extraterrestrische Physik, D-85748 Garching (Germany)

We investigate the combined effects of solar energetic particle propagation, parallel and perpendicular to the large-scale magnetic field in the solar wind. Numerical methods employing stochastic differential equations are used incorporating pitch-angle diffusion, focusing, and pitch-angle-dependent diffusion perpendicular to the magnetic field. We compute spatial distributions of approx100 keV electrons and 4 MeV protons in the inner heliosphere, assuming impulsive injection near the Sun over a limited range of solar longitude and latitude. In addition, spatial distributions and intensity-time profiles for various combinations of the parallel and perpendicular mean free path, with different assumptions for the dependence of lambda{sub perpendicular} on the radial distance and pitch angle, are investigated. We find that realistic results can be obtained when we assume that the perpendicular mean free path scales in the inner heliosphere with the gyroradius of the particles. Step-like decreases of particle intensities as frequently observed in impulsive events at 1 AU can be reproduced for a ratio of lambda{sub perpendicular}/lambda{sub ||} a few times 10{sup -5}.

• OSTI ID: 21392270
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 709; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
ATMOSPHERES
BARYONS
DIFFERENTIAL EQUATIONS
DIFFUSION
DISTRIBUTION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
EQUATIONS
FERMIONS
HADRONS
HELIOSPHERE
INCLINATION
KEV RANGE
KEV RANGE 100-1000
LEPTONS
MAGNETIC FIELDS
MAIN SEQUENCE STARS
MEAN FREE PATH
MEV RANGE
MEV RANGE 01-10
NUCLEONS
PROTONS
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR WIND
SPATIAL DISTRIBUTION
STARS
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR WINDS
STOCHASTIC PROCESSES
SUN
THREE-DIMENSIONAL CALCULATIONS