Anomalous Cosmic Ray Mean Free Pathlength in the Outer Heliosphere

Details Anomalous Cosmic Ray Mean Free Pathlength in the Outer Heliosphere Anomalous Cosmic Ray Mean Free Pathlength in the Outer Heliosphere

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh52b..10c&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH52B-10

Physics

7514 Energetic Particles (2114), 2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence

Scientific paper

We use energy spectra of anomalous cosmic rays obtained from the cosmic ray instruments on the Voyager 1 and 2 spacecraft to deduce the mean free pathlength of energetic particles with rigidities from approximately 0.3 to 3 GV over the time period from 1990 to early 2002. We find that at 1.5 GV in the outer heliosphere the mean free pathlength is a factor of 10 or more larger at solar minimum (1993-1999) than at solar maximum (1990-1991 and late 2001). We attribute this to conditions at high heliographic latitude being imprinted to lower latitudes via particle drifts. We also find evidence that the mean free pathlength in the outer heliosphere varies approximately linearly with radial distance at both solar maximum and solar minimum. This work was supported by NASA under contract NAS7-1407.

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