Particle propagation in the inner heliosphere

Details Particle propagation in the inner heliosphere Particle propagation in the inner heliosphere

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9819037k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A11, p. 19,037-19,047

Physics

40

Anisotropy, Gas Transport, Heliosphere, Interplanetary Magnetic Fields, Mean Free Path, Particle Diffusion, Scattering, Solar Wind, Helios Satellites, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves

Scientific paper

For 27 energetic particle events observed on one of the Helios spacecraft we present fits on the intensity and anisotropy time profiles performed with the model of focused transport. The events have local mean free paths lambdaparallel between 0.02 and larger than or equal to 1 AU, for most events lambdaparallel lies within or above the consensus range between 0.08 and 0.3 AU. The propagation in general can be described as focused or diffusive transport, therefore in the majority of events interplanetary scattering plays an important role. Comparing with results from ealier studies we find that scatter-free events can be observed inside 0.5 AU as well as close to 1 AU, therefore extreme scattering properties seem not to be related to radial changes in scattering conditions. In addition, any radial variation in the scattering mean free path seems to be small compared to the event-to-event variations. A comparison of fits on approx. 18-MeV protons and approx. 1-MeV electrons shows that the scattering mean free path lambdap of the protons is related to the electron mean free path lambdae, whereby the average ratio lambdap/lambdae is 1.6 +/- 0.9. This latter observation has important consequences for our understanding of the underlying scattering mechanism, in particular as it is contradiction with conventional results from quasi-linear theory.

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