Stone, E. C. and Cummings, A. C. and McDonald, F. B. and Heikkila, B. C. and Lal, N. and Webber, W. R. (2005) Voyager 1 Explores the Termination Shock Region and the Heliosheath Beyond. Science, 309 (5743). pp. 2017-2020. ISSN 0036-8075. https://resolver.caltech.edu/CaltechAUTHORS:20140826-084449577
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Abstract
Voyager 1 crossed the termination shock of the supersonic flow of the solar wind on 16 December 2004 at a distance of 94.01 astronomical units from the Sun, becoming the first spacecraft to begin exploring the heliosheath, the outermost layer of the heliosphere. The shock is a steady source of low-energy protons with an energy spectrum ∼E^(–1.41 ± 0.15) from 0.5 to ∼3.5 megaelectron volts, consistent with a weak termination shock having a solar wind velocity jump ratio r = 2.6^(+0.4)_(-0.2). However, in contradiction to many predictions, the intensity of anomalous cosmic ray (ACR) helium did not peak at the shock, indicating that the ACR source is not in the shock region local to Voyager 1. The intensities of ∼10–megaelectron volt electrons, ACRs, and galactic cosmic rays have steadily increased since late 2004 as the effects of solar modulation have decreased.
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| Additional Information: | © 2005 American Association for the Advancement of Science. 20 July 2005; accepted 16 August 2005. | |||||||||
| Group: | Space Radiation Laboratory | |||||||||
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| Issue or Number: | 5743 | |||||||||
| Record Number: | CaltechAUTHORS:20140826-084449577 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140826-084449577 | |||||||||
| Official Citation: | Stone, E. C., Cummings, A. C., McDonald, F. B., Heikkila, B. C., Lal, N., & Webber, W. R. (2005). Voyager 1 Explores the Termination Shock Region and the Heliosheath Beyond. Science, 309(5743), 2017-2020. doi: 10.1126/science.1117684 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 48885 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Jason Perez | |||||||||
| Deposited On: | 26 Aug 2014 20:39 | |||||||||
| Last Modified: | 20 Feb 2020 14:33 |
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