Features of cosmic ray variation at the phase of the minimum between the 23rd and 24th solar cycles |
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Authors: | G A Bazilevskaya M B Krainev V S Makhmutov A K Svirzhevskaya N S Svirzhevsky Yu L Stozhkov |
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Institution: | 1.Lebedev Physical Institute,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The minimum between the 23rd and 24th cycles of solar activity was unusually deep and extended. The modulation of cosmic rays
was minimal for the more than 70-year-long period of direct measurements. The data from stratospheric measurements by the
Lebedev Physical Institute suggest that the flux of cosmic rays with more than 100 MeV/nucleon of energy exceeded the highest
ever observed level (May 1965) by almost 12%. However, the ground-based neutron monitors sensitive to relatively high energies
indicated that the flux of cosmic rays increased by less than 3%. This work compares the variations in the cosmic rays over
periods of five minima of solar activity (the 20th to the 24th cycle). It is shown that in late 2008, an extra flux of particles
with energies less than several GeV/nucleon was detected in the Earth’s orbit. A similar (though far smaller in scale) phenomenon
was also observed in 1987 at the same orientation of the Sun’s magnetic field A < 0, but was not observed in epochs where A > 0. |
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