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Local Reacceleration of Galactic Cosmic Rays at the Heliosphere’s Termination Shock

McDonald, F. B. and Kota, J. and Cummings, A. C. and Jokipii, J. R. and Stone, E. C. (2003) Local Reacceleration of Galactic Cosmic Rays at the Heliosphere’s Termination Shock. In: Proceedings of the 28th International Cosmic Ray Conference. Vol.7. International Union of Applied Physics , Tokyo, Japan, pp. 3835-32838.

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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. Kota and Jokipii [1] have modelled the transport of GCRs and ACRs in 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.

Item Type:Book Section
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URLURL TypeDescription
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:Copyright Universal Academy Press Inc.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2003-38
Record Number:CaltechAUTHORS:20150403-083725157
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56330
Deposited By: Deborah Miles
Deposited On:15 Apr 2015 03:07
Last Modified:20 Feb 2020 14:33

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