Small-scale turbulence of the solar wind during the 11-year solar cycle

Details Small-scale turbulence of the solar wind during the 11-year solar cycle Small-scale turbulence of the solar wind during the 11-year solar cycle

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..540s&link_type=abstract

Astronomy Letters, Volume 25, Issue 8, August 1999, pp.540-543

Astronomy and Astrophysics

Astronomy

7

Scientific paper

We use 5-min measurements of the magnitude of the interplanetary magnetic field that were made between 1980 and 1991 from the IMP-8 spacecraft. We analyze the temporal variations in the behavior of the power spectra of fluctuations in the frequency range 10^{-4} - 1.67 x 10^{-3} Hz with solar cycle. The analysis uses information about the number of sunspots R_z and the flux of low-energy cosmic rays with E_p > 1 MeV. The level of small-scale ( 1010-1012 cm) turbulence of the solar wind is shown to vary regularly with the 11-year solar cycle. We conclude that one of the causes of this phenomenon could be the generation of MHD waves by streams of low-energy cosmic rays which are associated with the manifestation of solar coronal activity.

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