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  • SPACE RADIATION  (6)
  • 2005-2009
  • 1980-1984  (6)
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Year
  • 1
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    A study of temporal and radial dependencies of the anomalous helium and oxygen nuclei (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The intensity of the low energy anomalous helium and oxygen components has been continuously monitored by telescopes on the Pioneer 10 and IMP 7 and 8 spacecraft since 1972. After a period of relatively small temporal changes at earth between 1972 and 1978, during which it was possible to study the radial gradients of these components out to about 15 AU, large temporal changes were observed in 1978-1980 associated with the onset of the new solar modulation cycle. During this time period the anomalous He and O intensities at Pioneer 10 have decreased by a factor of greater than 10; however, both anomalous components were still present in the summer of 1980 at about 20 AU. At the earth similar large intensity changes have occurred. At Pioneer 10 the relative modulation of He nuclei is about 1.4x that of O nuclei at the same energy/nuc during this time period.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Time lags in solar modulation (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Von Rosenvinge and Paizis (1981) have discussed the amplitude variations of low energy cosmic rays, taking into account intensity-time variations which occurred starting in late 1973 and continued into mid-1975. The present investigation is concerned with the occurrence of so-called hysteresis effects during the considered period. A graph is presented which shows a comparison of the time-intensity plots for 35.3-82 MeV protons (340 MV) and the Deep River neutron monitor. A time lag can be observed between the neutron monitor intensity and the 35.3-82 MeV proton intensity. The same data is replotted to show a hysteresis loop. A plot for 35.1-82 MeV/n helium is also provided. It is found that all measured values of the time lag for protons and helium are consistent with those reported by Klecker et al. (1980). It is pointed out that the time lag for the anomalous helium is not consistent with the model of O'Gallagher (1975).
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Amplitudes of solar modulation of low energy cosmic rays (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: There have been differences of opinion regarding the origin and behavior of the solar modulation of galactic cosmic rays. It has been shown that the return to solar maximum intensity levels beginning in early 1978 was dominated by Forbush decreases. These Forbush decreases were caused by radially moving interplanetary shocks resulting from large solar flares. The present investigation is concerned with solar modulation effects which were observed during the previous solar minimum. The effects were associated with high-speed streams in the solar wind. These streams caused the formation of corotating interaction regions with both forward and reverse shocks. The modulation effects seen near earth are intimately connected with these shocks.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
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    NASA TECHNICAL REPORTS
  • 4
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    A study of the effects of Forbush decreases and the 11-year variation of cosmic rays out to approximately 16 AU (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In this study the onset of the new solar modulation cycle in late 1977 has been observed out to 16 AU. 27-day average cosmic-ray data (E greater than 60 MeV) from Pioneers 10, 11 and IMP 8 for the period for 1973-1978, normalized to the ground-based neutron monitor rates, have been used. Observations indicate that the long-term modulation effects propagate outward radially at 200-300 Km/sec. Forbush decreases, in contrast, are local phenomena and the associated time delays between their occurrence at earth and out to a few AU are much shorter. The data yield a radial gradient of 2-3% per AU.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A survey of He-3 enriched events between 1974 and 1978 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In five years of observations between 1974 and 1978, at least 17 He-3 enriched events have been identified in the energy range 2 to 13 MeV/nucleon, with He-3/He-4 ratios ranging from less than 0.1 to greater than 4. The scarcity of H-2 in He-3 events found by other workers is confirmed in this data. Flattening of He-3 spectra relative to He-4 is identified in several of the events. Many but not all of the sampled events are found to have small H-1/He-4 ratios. A sum of the sampled events shows not only Fe enrichments but abundances enhanced relative to oxygen of all heavier elements. No substantial depletion of carbon is identified. A dependence of the enhancements in He-3 events on atomic number like that found in other Fe-enriched solar cosmic ray events suggests a common mechanism producing the enhancements.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
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    NASA TECHNICAL REPORTS
  • 6
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    A survey of solar cosmic ray composition 1974-1978 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Data on solar particle composition from the Goddard experiment on IMP 8 now spans a period of five years. During this time, detailed abundances and spectra have been obtained for elements through the Fe group and isotopic abundances have been obtained for H and He from a number of the largest flare-associated solar particle events. In the energy range 6.7-15 MeV/nucleon, a systematic enhancement of solar cosmic ray over solar photospheric Na, Mg, Al and Si abundances relative to oxygen is shown to exist in all these large flare events. An additional enhancement of abundances in the elements beyond carbon relative to oxygen that is correlated with atomic charge (or mass) occurs in certain events and produces a variability in Fe/O greater than a factor of 10. Summed over these eight large flares, the Be/O and B/O ratios are shown to be less than 0.0002 and Li/O to be less than 0.001 between 4.2 and 15 MeV/nucleon.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
    Format: text
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    NASA TECHNICAL REPORTS
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