Solar Physics

, Volume 243, Issue 2, pp 231–235 | Cite as

Solar Polarity Dependence of Cosmic Ray Power Spectra Observed with Mawson Underground Muon Telescopes

  • I. SabbahEmail author
  • M. L. Duldig


Power spectral density (PSD) of cosmic rays has been calculated from hourly averaged counts observed by underground muon telescopes located at Mawson over the low-frequency range 2.7×10−7 – 1.4×10−4 Hz. The first two harmonics of the solar daily variation are well defined for even cycles (20 and 22) whereas only the first harmonic is defined in cycle 21. The amplitude of the diurnal variation is lower for even cycles than for the odd cycle. The spectral power of the odd cycle exceeds those of the even cycles. The spectra are flatter and have lower power when the interplanetary magnetic field (IMF) is directed away from the Sun above the current sheet (A>0) than when the IMF is directed toward the Sun above the current sheet (A<0). The spectra imply that heliospheric magnetic turbulence may be more variable on time scales of several years than previously suspected.


Solar Cycle Power Spectral Density Current Sheet Solar Phys Interplanetary Magnetic Field 
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© Springer 2007

Authors and Affiliations

  1. 1.Department of Physics, Faculty of ScienceKuwait UniversityKuwaitKuwait
  2. 2.Department of Physics, Faculty of ScienceUniversity of AlexandriaAlexandriaEgypt
  3. 3.Australian Antarctic DivisionDepartment of the Environment and Water ResourcesKingstonAustralia

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