Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3835m&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
Scientific paper
The measured intensities in the ecliptic plane of the GCR He (265 MeV/n) and ACR Oxygen (7 17 MeV/n) at 70 AU over the solar minimum (1996-1998) of cycle 22 are significantly less than that observed over the 1987 solar minimum of cycle 21 at 42 AU. The GCR He at 42 AU is 36% greater than that at 70 AU while ACR O is 5x greater. The different intensity levels and their very different time histories in the opposite phases of the heliomagnetic cycle represent a challenge to modulation theory and must in part be a drift related effect. K´ta and Jokipii [1] have modelled the transport of GCRs and ACRs in o a 1D model that includes a termination shock and a heliosheath region and in a 2D heliosphere that includes not only drifts but also the effects of an extended heliosheath region. They find that near the plane of the ecliptic in qA<0 cycles there is a significant enhancement of GCRs produced by local reacceleration in the heliosheath. This is accompanied by a much larger increase in the ACR O intensity, consistent with the Pioneer/Voyager observations.
Cummings Alan C.
Jokipii Randy J.
Kota József
McDonald Frank B.
Stone Edward C.
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