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Latitudinal and field-aligned cosmic ray gradients 2 to 5 AU Voyagers 1 and 2 and IMP 8Results are presented showing that the contemporary picture of a relatively small heliocentric radial gradient is generally correct. They emphasize that such a gradient should really be thought of in terms of field-aligned structures since the cosmic ray populations tend to 'corotate' locally with the interplanetary field structure. Nonuniform latitudinal gradients of approximately 2 to 5 percent/deg in structures lasting 10 to 30 days are identified unambiguously. Additional evidence is seen for somewhat smaller latitudinal gradients often north to south and probably mixed with small field-aligned gradients of less than 1 percent/AU that persist for several solar rotations. It is suggested that these smallest ephemeral latitudinal gradients manifest themselves by affecting the degree of irregularity in diurnal variations of high latitude neutron monitors.
Document ID
19840033215
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Roelof, E. C.
(Johns Hopkins Univ. Silver Spring, MD, United States)
Decker, R. B.
(Johns Hopkins Univ. Silver Spring, MD, United States)
Krimigis, S. M.
(Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1983
Publication Information
Publication: Journal of Geophysical Research
Volume: 88
ISSN: 0148-0227
Subject Category
Space Radiation
Accession Number
84A16002
Funding Number(s)
CONTRACT_GRANT: NAGW-154
CONTRACT_GRANT: NASA TASK I
CONTRACT_GRANT: AF TASK ZF10
CONTRACT_GRANT: N00024-78-C-5384
Distribution Limits
Public
Copyright
Other

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