Ion injection and shock acceleration in the outer heliosphere

Voyager 2 data from 47 AU shows a delay of about 6 days between the arrival of interplanetary shock fronts and the peaks in the 0.52–1.45 MeV energetic proton flux. Similar data recorded when Voyager 2 was at 5 AU shows that the shock fronts and the peaks in the energetic proton flux are virtually c...

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Bibliographic Details
Published inGeophysical research letters Vol. 27; no. 4; pp. 509 - 512
Main Authors Rice, W. K. M., Zank, G. P., Richardson, J. D., Decker, R. B.
Format Journal Article
LanguageEnglish
Published Washington, DC Blackwell Publishing Ltd 15.02.2000
American Geophysical Union
Subjects
Astronomy
Earth, ocean, space
Exact sciences and technology
Interplanetary space
Particle acceleration
Solar system
Heliosphere
MHD model
Cosmic protons
Digital simulation
One dimensional model
Galactic cosmic rays
Solar wind
Interplanetary shock wave
Ion injection
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Summary:Voyager 2 data from 47 AU shows a delay of about 6 days between the arrival of interplanetary shock fronts and the peaks in the 0.52–1.45 MeV energetic proton flux. Similar data recorded when Voyager 2 was at 5 AU shows that the shock fronts and the peaks in the energetic proton flux are virtually coincident. If injection and acceleration is taking place at the shock fronts one would expect the peaks in the energetic proton flux and the shocks to coincide. We show that the delay observed at 47 AU can be understood if the injection and acceleration of energetic protons becomes negligibly small some time before the shocks are observed.
Bibliography:istex:5D294AFF1848ECA3A971A987BE9A083B3ACD7C12
ArticleID:1999GL010731
ark:/67375/WNG-M2MSBWNS-6
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0094-8276
1944-8007
DOI:10.1029/1999GL010731