Cosmic ray measurements on board Helios 1 from December 1974 to September 1975: Quiet time spectra, radial gradients, and solar events
Item
Title (Dublin Core)
en-US
Cosmic ray measurements on board Helios 1 from December 1974 to September 1975: Quiet time spectra, radial gradients, and solar events
Description (Dublin Core)
en-US
The University of Kiel cosmic ray experiment on board Helios 1 measures nucleons above 1. 7 MeV/nucleon and electrons above 0.3 MeV in the inner solar system between 1.0 and 0.3 AU from the Sun. A first survey is given on quiet time proton and Helium spectra which are compared near Earth and close to perihelion. The anomalous Helium component is also present at radial distances within 0.4 AU. Quiet time Helium spectra from 3.8 to 48 MeV/nucleon gradually increase between December 1974 and June 1975. For the integral radial gradient (protons above 51 MeV) we estimate a value of (11±2.5) %/AU during a period of slowly increasing cosmic ray intensity. We discuss solar particle events on January 5 (at 0.93 AU), March 7 (at 0.41 AU), and March 19, 1975 (at 0.32 AU). The March 19 event was measured closer to the Sun than any other event before. It exhibits sharp temporal structures, differences in the time profiles of various particle species, and a large abundance of Helium 3, with a 3He/4He ratio of 2 to 3 in the range 5 to 7 MeV/nucleon. This event occurred close to the peak of a high speed solar wind stream.
ARK: https://n2t.net/ark:/88439/y032443
Permalink: https://geophysicsjournal.com/article/183
ARK: https://n2t.net/ark:/88439/y032443
Permalink: https://geophysicsjournal.com/article/183
Creator (Dublin Core)
Kunow, H.
Witte, M.
Wibberenz, G.
Hempe, H.
Mueller-Mellin, R.
Green, G.
lwers, B.
Fuckner, J.
Subject (Dublin Core)
en-US
Cosmic rays
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Quiet time energy spectra
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Radial gradients
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Solar events
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3He-rich events
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Space
Publisher (Dublin Core)
en-US
Journal of Geophysics
Date (Dublin Core)
1976-04-08
Type (Dublin Core)
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
en-US
Peer-reviewed Article
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/183
Source (Dublin Core)
en-US
Journal of Geophysics; Vol 42 No 1 (1976): Journal of Geophysics; 615-631
2643-2986
2643-9271
Language (Dublin Core)
eng
Relation (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/183/143