Evidence That Particle Drift Does not Contribute Significantly to Low-Rigidity ACR Transport During A > 0 Recovery

Details Evidence That Particle Drift Does not Contribute Significantly to Low-Rigidity ACR Transport During A > 0 Recovery Evidence That Particle Drift Does not Contribute Significantly to Low-Rigidity ACR Transport During A > 0 Recovery

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh71a..06h&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH71A-06

Physics

2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 7859 Transport Processes

Scientific paper

We report on 0.6 to 40 MeV/nucleon outer heliospheric anomalous cosmic ray (ACR) ions having a broad range of rigidities from 130 MV to 4.3 GV during the A > 0 recovery phase from 1991 to 1999. Intensity measurements (made primarily with the Voyager 1 and 2 Low Energy Charged Particle instruments) of ACR H, He, and O with rigidities below approximately 2 GV provide evidence that diffusion, convection, and adiabatic cooling are significant transport effects but that curvature and gradient drifts are not. Above 2 GV we find that drifts do play a significant role in ACR transport. This understanding is based in part on our unexpected determination of negative latitudinal intensity gradients for low-rigidity ACRs and our numerical solution to the cosmic ray transport equation. We present the observational and modeling evidence for this interpretation and make estimates regarding transport parameters. This study of ACRs has a direct bearing on our understanding of the relative importance of various mechanisms in the transport of energetic charged particles in the heliosphere.

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