1971
DOI: 10.1029/jb076i017p04127
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Radial gradient of cosmic rays from the Lost City meteorite

Abstract: The radioactivities of 37Ar (35‐day half‐life) and 39Ar (270‐year half‐life) were measured in the separated iron phase and in whole‐rock samples of the Lost City meteorite. Two samples of magnetic phase were dissolved in acid, thus releasing the argon radioactivities. Those radioactivities were concordant. After the calcium and potassium contributions to the argon radioactivities were removed, the average values of the 37Ar and 39Ar from the iron and nickel at the time of fall were 11.7±0.9 dpm/kg and 24.6±0.9… Show more

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Cited by 25 publications
(4 citation statements)
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“…This radial modulation of the GCR is an important factor in comparing the rates for nuclear reactions at different radial distances from the sun. This effect has been seen in meteorites whose orbits extended several AU beyond the earth's orbit [Forman et al, 1971;Fireman and Spannagel, 1971]. The magnitude of the radial modulation is not well known for distances other than I AU.…”
Section: Galactic Cosmic Raysmentioning
confidence: 98%
See 1 more Smart Citation
“…This radial modulation of the GCR is an important factor in comparing the rates for nuclear reactions at different radial distances from the sun. This effect has been seen in meteorites whose orbits extended several AU beyond the earth's orbit [Forman et al, 1971;Fireman and Spannagel, 1971]. The magnitude of the radial modulation is not well known for distances other than I AU.…”
Section: Galactic Cosmic Raysmentioning
confidence: 98%
“…[Webber, 1967]. Recent meteorite data [Forman et al, 1971;Fireman and Spannagel, 1971] point up these variations. None the less, it is possible to determine a mean flux and spectrum at a given distance from the sun, averaged over many 11-year solar cycles.…”
mentioning
confidence: 99%
“…This distance D is called the boundary of the modulating region. It may be associated with the slowing down of the solar wind so that the convection velocity goes to zero or, perhaps more reasonably, the waves that scatter the cosmic rays damp away [Jokip•i and Davis, [Fireman and Spannagel, 1970;Forman, 1971]. However, it should be mentioned that Krimigis [1968Krimigis [ , 1969 and Anderson [1968] reported values of the gradient from Mariner 4 data that disagree with that of O'Gallagher, and which are also inconsistent with each other.…”
Section: The Modulation Phenomenon Comprises a Number Of Effects Incmentioning
confidence: 99%
“…However, the reduction at 1 AU is not as large as a factor of 3, which is necessary to explain the low 37Ar activities in Wethersfield, Nejo, and Caseria Ucera. If a meteoroid strikes the earth on its outbound trip as it orbits the sun, it passes through perihelion during the approximately 50 days before fall 11.7 ± 0.9 24.6 ± 0.9 Fireman and Spannagel, 1971 15.1 ± 2.5 20.0 ± 1.5 Begemann, 1972Sprucefield Apr. 25, 1969 21.5 ± 1.6 23.9 ± 1.6 Fireman and Goebel, 1970 St. Severin (3) (4) when 37Ar is produced.…”
Section: Comparison Of Argon Activities In Meteoritesmentioning
confidence: 99%