Modulation of cosmic ray protons in the heliosheath

Details Modulation of cosmic ray protons in the heliosheath Modulation of cosmic ray protons in the heliosheath

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.8039l&link_type=abstract

Journal of Geophysical Research, Volume 108, Issue A10, pp. LIS 14-1, CiteID 8039, DOI 10.1029/2003JA009934

Physics

16

Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Discontinuities, Interplanetary Physics: Energetic Particles, Heliospheric (7514)

Scientific paper

A contemporary numerical model including a solar wind termination shock, a heliosheath, and drifts is used to study the features of cosmic ray proton modulation in the outer heliosphere. Voyager and Pioneer spacecraft observations over 22 years and out to ~82 AU have shown markedly different behavior for minimum modulation conditions between the radial intensity profiles for periods of opposite magnetic polarities and that most of the residual modulation for these periods took place in the outer heliosphere, near and beyond where the termination shock is expected to be. The modeling results show that the inclusion of a termination shock in the modulation model for solar minimum conditions causes abrupt changes in the radial gradients, gr, at the termination shock, at almost all energies of interest to modulation studies. During A > 0 solar magnetic field polarity cycles this ``barrier'' effect contributes ~60% to the overall modulation at 0.5 GeV. However, for A < 0 cycles the contribution at this energy is markedly smaller. For increased solar activity the modulation in the heliosheath is quite different from minimum activity. The heliosheath does not any longer play the role of a distinguished ``barrier,'' although abrupt changes in gr at the shock may still occur, especially for A > 0 cycles, surprisingly more so for higher energies.

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