Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010astl...36..438s&link_type=abstract
Astronomy Letters, Volume 36, Issue 6, pp.438-443
Astronomy and Astrophysics
Astronomy
Comic Rays, Solar Cycle, Solar Wind, Magnetosphere, Geostationary Orbit
Scientific paper
We present the results of our studies of the cosmic-ray fluctuations in the frequency range 10-4-1.67 × 10-3 Hz based on energetic particle flux measurements on spacecraft in the solar wind, in the magnetosphere, and at Earth in the 11-year solar cycle. The cosmic-ray fluctuation spectrum is shown to have an 11-year modulation related to the solar cycle. A different behavior of the level of energetic particle fluctuations measured in different regions of space is observed for cosmic rays of different origins. We conclude that the new, previously unknown phenomenon of 11-year modulation of the cosmic-ray fluctuation spectrum has been established. A possible explanation of this phenomenon is given.
Starodubtsev S. A.
Usoskin Ilya G.
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