Modulation of Anomalous Protons with Increasing Solar Activity

Details Modulation of Anomalous Protons with Increasing Solar Activity Modulation of Anomalous Protons with Increasing Solar Activity

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3749p&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

1

Scientific paper

A comprehensive time-dep endent modulation model including particle drifts, enhanced perpendicular diffusion, a solar wind termination shock (TS), and a heliosheath is used to study the acceleration and modulation of anomalous protons with increasing solar activity. Solar activity is represented by increasing the `tilt angle α' from 10° to 70° , reducing global drifts, changing the effectiveness of the TS directly by decreasing the compression ratio s, and by decreasing the effective radial diffusion coefficient. Surprisingly, the effectiveness of the acceleration of the ACR protons improves with increasing α for the A > 0 polarty cycle but not for A < 0. Changing s has a profound effect on all spectra.

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