Long‐term negative trend in cosmic ray flux

Stozhkov, Y. I.; Pokrevsky, P. E.; Okhlopkov, V. P.

doi:10.1029/1999ja900385

Cited by 25 publications

(15 citation statements)

References 15 publications

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“…2, is much steeper, about −0.16 ± 0.07%/year. The ratio of this trend and the trend estimated by Stozhkov et al (2000) is about 4 (ranging roughly from 2 to 6). On the other hand, the trend calculated from the U02 CR(NM) series is only −0.025 ± 0.03%/year, in agreement with the results by Ahluwalia (2000); Stozhkov et al (2000).…”

Section: Comparison Of the Resultsmentioning

confidence: 96%

“…The ratio of this trend and the trend estimated by Stozhkov et al (2000) is about 4 (ranging roughly from 2 to 6). On the other hand, the trend calculated from the U02 CR(NM) series is only −0.025 ± 0.03%/year, in agreement with the results by Ahluwalia (2000); Stozhkov et al (2000). Accordingly, since this result is based on the observed changes in solar activity, there is no need to introduce an additional effect by a supernova explosion, as suggested by Stozhkov et al (2000).…”

Section: Comparison Of the Resultsmentioning

confidence: 96%

“…Note that the CR intensity around solar minima corresponds to a residual modulation in a quiet heliosphere. Stozhkov et al (2000) calculated the trend in the residual modulation when trying to estimate the stability of CR intensity outside the heliosphere. They found that this trend is −0.04 ± 0.04%/year for the Climax NM data after 1953 and attributed it to a possible supernova explosion in the vicinity of the solar system.…”

Section: Comparison Of the Resultsmentioning

confidence: 99%

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Reconstructing the long-term cosmic ray intensity: linear relations do not work

2003

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Abstract. It was recently suggested (Lockwood, 2001) that the cosmic ray intensity in the neutron monitor energy range is linearly related to the coronal source flux, and can be reconstructed for the last 130 years using the long-term coronal flux estimated earlier. Moreover, Lockwood (2001) reconstructed the coronal flux for the last 500 years using a similar linear relation between the flux and the concentration of cosmogenic 10 Be isotopes in polar ice. Here we show that the applied linear relations are oversimplified and lead to unphysical results on long time scales. In particular, the cosmic ray intensity reconstructed by Lockwood (2001) for the last 130 years has a steep trend which is considerably larger than the trend estimated from observations during the last 65 years. Accordingly, the reconstructed cosmic ray intensity reaches or even exceeds the local interstellar cosmic ray flux around 1900. We argue that these unphysical results obtained when using linear relations are due to the oversimplified approach which does not take into account the complex and essentially nonlinear nature of long-term cosmic ray modulation in the heliosphere. We also compare the long-term cosmic ray intensity based on a linear treatment with the reconstruction based on a recent physical model which predicts a considerably lower cosmic ray intensity around 1900.

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Section: Comparison Of the Resultsmentioning

confidence: 96%

Section: Comparison Of the Resultsmentioning

confidence: 96%

Section: Comparison Of the Resultsmentioning

confidence: 99%

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Reconstructing the long-term cosmic ray intensity: linear relations do not work

2003

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“…A systematic decrease is observed in all data sets near the solar minimum epochs for the period 1965-1987. The observed decrease is ascribed by the authors of [5] to a supernova explosion in the near-interstellar medium; however, it is disputed by Ahluwalia [4], who ascribes it to the long-term modulation of galactic cosmic ray flux within the heliosphere by solar wind.…”

Section: Introductionmentioning

confidence: 78%

“…Galactic cosmic ray intensity data have been analyzed by Stozhkov et al [5] and by Ahluwalia [4] for four consecutive solar activity minima (the period 1963-1998). The data obtained with a variety of detectors located at the global sites as well as the balloon altitudes are used in both the studies.…”

Section: Introductionmentioning

confidence: 99%

Galactic Cosmic Ray Modulation Up to Recent Solar Cycles

Agarwal¹,

Mishra²

2011

Latvian Journal of Physics and Technical Sciences

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Cosmic ray neutron monitor counts obtained by different ground-based detectors have been used to study the galactic cosmic ray modulation during the last four solar activity cycles. Since long, systematic correlative studies have been performed to establish a significant relationship between the cosmic ray intensity and different helio-spheric activity parameters, and the study is extended to a recent solar cycle (23). In the present work, the yearly average of 10.7 cm solar radio flux and the interplanetary magnetic field strength (IMF, B) have been used to find correlation of the yearly average cosmic ray intensity derived from different neutron monitors. It is found that for four solar cycles (20-23) the cosmic ray intensity is anti-correlated with the 10.7 cm solar radio flux and the IMF, B value with some discrepancy. However, this is in a good positive correlation with the flux of mentioned wavelength for four different solar cycles. The IMF, B shows a weak correlation with cosmic rays for solar cycle 20, and a good anti-correlation for solar cycles 21-23.

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Cosmic Ray Influence on Planetary Cloud Covering and Long Term Climate Change

Дорман

2004

Astrophysics and Space Science Library

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Long‐term negative trend in cosmic ray flux

Abstract: Abstract. The cosmic ray fluxes in four consecutive solar activity Ininilna (1964-1965, 1976-1977, 1987, and 1996-1997)

Cited by 25 publications

References 15 publications

Reconstructing the long-term cosmic ray intensity: linear relations do not work

Reconstructing the long-term cosmic ray intensity: linear relations do not work

Galactic Cosmic Ray Modulation Up to Recent Solar Cycles

Cosmic Ray Influence on Planetary Cloud Covering and Long Term Climate Change

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