Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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Influence of solar wind turbulence on the low-energy cosmic ray frequency spectrum in October-November 2003 events from ACE spacecraft data
Starodubtsev S.A., Grigoryev A.V., Timofeev V.E.,

The dynamics of power spectra in cosmic ray fluctuations and the IMF module during the extra-events in October-November 2003 is studied. ACE spacecraft data are used in the analysis: 300-s data of solar particle fluxes, 16-s and 240-s data of the IMF module and 240-s data of solar wind plasma parameters. It is found that during these events the turbulent field in the range of $10^{-4} - 3 \cdot 10^{-2}$ Hz increases by about two order of magnitude in comparison with the undisturbed level and can be $10^{-10}$ ergs/cm3. It is shown that the significant rise of the charged particle fluxes initiates the changes in the low-energy cosmic ray fluctuation spectrum. In this case, a coherence function of cosmic ray fluctuations in differential channels is more than $0.9$ over all investigated frequency interval. It is concluded about the essential contribution of fast magnetosonic waves to IMF turbulence spectra observed during the registration of the particle fluxes of solar and interplanetary origin and the modulation by them the cosmic ray frequency spectrum.

Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004