Local and global scattering properties of the interplanetary medium obtained from Solar Energetic Particles (SEPs)

Details Local and global scattering properties of the interplanetary medium obtained from Solar Energetic Particles (SEPs) Local and global scattering properties of the interplanetary medium obtained from Solar Energetic Particles (SEPs)

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...40w&link_type=abstract

Kiel Univ., International Solar Wind 8 Conference, p. 40

Statistics

Energetic Particles, Electron Scattering, Interplanetary Medium, Solar Corpuscular Radiation, Solar Flares, Solar Physics, Solar Storms, Sun, Solar Magnetic Field, Mean Free Path, Helios 1, Helios 2, Azimuth, Anisotropy, Transport Properties, Mathematical Models, Normalizing (Statistics)

Scientific paper

Solar energetic particles can be used as probes for the turbulence level in the interplanetary medium. It is of general interest to compare the LOCAL scattering properties near an observer with GLOBAL properties which characterize the average scattering along the magnetic field. We discuss various methods by which the scattering conditions can be determined: (1) overall fits of observed particle intensities and anisotropies to a transport model; (2) evaluation of the steady-state pitch angle distribution; and (3) suitably normalized angular distributions during the intensity maximum of a particle event. Energetic particle data from HELIOS 1/2 are analyzed, and the mean free paths obtained with the different methods are compared with each other. As a result one can state: (1) for a number of solar particle events the radial mean free path is essentially constant between the Sun and Helios; and (2) large variations in the degree of scattering exist from one event to the other. These results indicate the existence of 'regimes' where the amount of particle scattering is relatively constant over extended regions in radius and azimuth, but with marked differences from one regime to the other.

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