Radial transport of energetic solar flare particles from 1 to 6 AU

Journal Article · Wed Jun 01 04:00:00 EDT 1977 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA082i016p02157· OSTI ID:7110003

Hamilton, D C

The Pioneer 10 and 11 missions to Jupiter and beyond have provided the first opportunity to observe solar flare acclerated particles at distances of several astronomical units from the sun. The intensity-time profiles out to at least 6 AU ae consistent with mainly diffusive interplanetary propagation. No obvious effects of a free escape boundary have been observed, which implies that the outer boundary of the diffusion region is beyond to AU. Four solar particle events are discussed in detail. These are events during which azimuthal propagation and corotation effects played a relatively minor role at least until the time of maximum intensity. Their intensity-time profiles, which were observed simultaneously at two or three well-separated radial positions (with Imp 6 or Imp 8 at I AU and with Pioneer 10 and/or Pioneer 11 at 2.7-6.1 AU), are used to study the radial transport of energetic particles in interplanetary space. The events are interpreted in terms of a spherically symmetric propagation model which includes the effects of diffusion, convection, and adiabatic deceleration and which assumes that the particles are impulsively injected at the sun.

• Research Organization: Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637
• OSTI ID: 7110003
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 82:16; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYONS
CONVECTION
DIFFUSION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY TRANSFER
FERMIONS
HADRONS
HEAT TRANSFER
IMP SATELLITES
INTERPLANETARY SPACE
LEPTONS
NUCLEONS
PIONEER SPACE PROBES
PROTONS
RADIATIONS
SATELLITES
SOLAR ACTIVITY
SOLAR ELECTRONS
SOLAR FLARES
SOLAR PARTICLES
SOLAR PROTONS
SOLAR RADIATION
SPACE
SPACE VEHICLES
STELLAR RADIATION