Voyager 1 Observes Low-Energy Galactic Cosmic Rays in a Region Depleted of Heliospheric Ions
- E. Stone, A. Cummings, F. Mcdonald, B. Heikkila, N. Lal, W. Webber
- PhysicsScience
- 12 July 2013
Observations of energetic ions and electrons by Voyager 1 suggest that a sharp and distinct boundary was crossed five times over ∼30 days, indicating that Voyager 1 had not crossed the heliopause but had entered a region in the heliosphere that serves as a magnetic highway along which low-energy ions from inside stream away and galactic cosmic rays flow in from interstellar space.
A New Estimate of the Local Interstellar Energy Density and Ionization Rate of Galactic Cosmic Cosmic Rays
- W. Webber
- Physics
- 10 October 1998
Using data from the Voyager and Pioneer spacecraft at distances up to 60 AU from the Sun to help define the effects of solar modulation, we have made a new estimate of the local interstellar…
Voyager 1 Explores the Termination Shock Region and the Heliosheath Beyond
- E. Stone, A. Cummings, F. Mcdonald, B. Heikkila, N. Lal, W. Webber
- PhysicsScience
- 23 September 2005
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, and the intensities of ∼10–megaelectron volt electrons, ACRs, and galactic cosmic rays have steadily increased since late 2004.
GALACTIC COSMIC RAYS IN THE LOCAL INTERSTELLAR MEDIUM: VOYAGER 1 OBSERVATIONS AND MODEL RESULTS
- A. Cummings, E. Stone, T. Porter
- PhysicsAstrophysical Journal
- 21 October 2016
Since 2012 August Voyager 1 has been observing the local interstellar energy spectra of Galactic cosmic-ray nuclei down to 3 MeV nuc−1 and electrons down to 2.7 MeV. The H and He spectra have the…
An asymmetric solar wind termination shock
- E. Stone, A. Cummings, F. Mcdonald, B. Heikkila, N. Lal, W. Webber
- PhysicsNature
- 3 July 2008
The intensity of 4–5 MeV protons accelerated by the shock near Voyager 2 was three times that observed concurrently by Voyager 1, indicating differences in the shock at the two locations.
The Modified Weighted Slab Technique: Models and Results
- F. C. Jones, A. Lukasiak, V. Ptuskin, W. Webber
- Physics
- 19 July 2000
In an attempt to understand the source and propagation of Galactic cosmic rays, we have employed the modified weighted slab technique along with recent values of the relevant cross sections to…
Production of cosmogenic Be nuclei in the Earth's atmosphere by cosmic rays: Its dependence on solar modulation and the interstellar cosmic ray spectrum
Recent work by McCracken [2001] shows that 10 Be production rates by cosmic rays on the polar plateau are little affected by geomagnetic field changes in the last few hundred years. Also, the 10 Be…
Recent Voyager 1 data indicate that on 25 August 2012 at a distance of 121.7 AU from the Sun, sudden and unprecedented intensity changes were observed in anomalous and galactic cosmic rays
- W. Webber, F. Mcdonald
- Physics
- 16 May 2013
At the Voyager 1 (V1) spacecraft in the outer heliosphere, the intensities of both anomalous cosmic rays and galactic cosmic rays (GCRs) changed suddenly and decisively on 25 August (121.7 AU from…
Production of the cosmogenic isotopes 3H, 7Be, 10Be, and 36Cl in the Earth's atmosphere by solar and galactic cosmic rays
- W. Webber, P. Higbie, K. Mccracken
- Physics, Geology
- 1 October 2007
[1] In a follow-up study to the earlier work of Webber and Higbie (2003) on 10Be production in the Earth's atmosphere by cosmic rays, we have calculated the atmospheric production of the cosmogenic…
The isotopic composition of cosmic-ray beryllium and its implication for the cosmic ray's age
- A. Lukasiak, P. Ferrando, F. Mcdonald, W. Webber
- Physics
- 1 March 1994
We report a new measurement of the cosmic-ray isotopic composition of beryllium in the low-energy range from 35 to 113 MeV per nucleon. This measurement was made using the High Energy Telescope of…
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