The Energetic Particle Populations of the Distant Heliosphere
- Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742 (United States)
- California Institute of Technology, Pasadena, California 91125 (United States)
- NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
- Department of Physics and Astronomy, New Mexico State University, Las Cruces, New Mexico 88003 (United States)
In late 2003 as Voyager 1 moves beyond 90 AU in the recovery phase of solar cycle 23, the effects of the termination shock (TS) and the heliosheath on particle transport are becoming more evident. There are now detectable fluxes of 2.5 - 70 MeV electrons but at low intensity levels that suggest they are heavily modulated in the heliosheath. The modulation of galactic and anomalous cosmic rays is significant but much smaller than observed at 1 AU. At V1 a large increase of MeV ions was observed with a flat energy spectra which persisted over a period of 6.5 months. A second event has now been in progress for some eight months. These ions appear to originate at the TS. At V2, 17 AU behind V1, there are a series of 8 increases of low energy ions that occur approximately every 140 days starting in late 2000. Many of these increases can be related to specific periods of high solar activity that occurred some 6 months earlier.
- OSTI ID:
- 20633017
- Journal Information:
- AIP Conference Proceedings, Vol. 719, Issue 1; Conference: 3. international IGPP conference on physics of the outer heliosphere, Riverside, CA (United States), 8-13 Feb 2004; Other Information: DOI: 10.1063/1.1809511; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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