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Appearance of a Third Episode of Enhanced Particle Intensities at 94 AU: Voyager 1 in the Heliosheath

Stone, E. C. and Cummings, A. C. and McDonald, F. B. and Heikkila, B. C. and Lal, N. and Webber, W. R. (2005) Appearance of a Third Episode of Enhanced Particle Intensities at 94 AU: Voyager 1 in the Heliosheath. In: Proceedings of the 29th International Cosmic Ray Conference. Vol.2. Tata Institute of Fundamental Research , Mumbai, India, pp. 43-44.

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The Voyager 1 spacecraft crossed the solar wind termination shock on 16 December 2004 at 94.0 AU and began observing a new episode of enhanced intensities of termination shock particles (TSPs) in the heliosheath. Two earlier TSP episodes were observed upstream of the shock beginning in mid-2002 at 84 AU as Voyager 1 and the shock were moving outward together. The upstream TSPs exhibited strong field-aligned beaming and large spectral variability on a daily time scale that likely resulted from variations in the connectivity of Voyager 1 to the source at the shock. In the heliosheath the TSP intensity and spectra are much less variable and the field aligned streaming greatly reduced, consistent with more uniform propagation conditions and a stable source intensity. The gradual evolution of the of the TSP and ACR spectra as Voyager l moves further beyond the shock should reveal new aspects of the heliosheath and acceleration of TSPs and ACRs.

Item Type:Book Section
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Stone, E. C.0000-0002-2010-5462
Cummings, A. C.0000-0002-3840-7696
Additional Information:© 2005 Tata Institute of Fundamental Research. Provided by the NASA Astrophysics Data System. This work was supported by NASA under contract NAS7-03001.
Group:Space Radiation Laboratory
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Record Number:CaltechAUTHORS:20140827-093513358
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48973
Deposited By: Tony Diaz
Deposited On:03 Sep 2014 14:14
Last Modified:20 Feb 2020 14:33

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