27-day variations of solar indices and cosmic ray neutron monitor intensities

Details 27-day variations of solar indices and cosmic ray neutron monitor intensities 27-day variations of solar indices and cosmic ray neutron monitor intensities

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008an....329...20m&link_type=abstract

Astronomische Nachrichten, Vol.329, Issue 1, p.20

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Cosmic Rays, Sun: Activity, Sun: Rotation

Scientific paper

Solar activity indices (coronal, chromospheric as well as photospheric) and cosmic ray neutron monitor rates (different cut-off rigidity) have been used to study 27-day variations in the years from 1957 to 2004. Daily data were employed for this purpose, analysed by the FFT and wavelet techniques. To work with a continuous data set for the cosmic rays (CR), the `Composite Cosmic Ray' (CCR) set was first created from the observations carried out at different neutron monitor stations. The CCR frequency analysis shows significant 27-day variations in the intensity of CR, with its amplitude's values very sensitive to the sign of the quantity qA. The most significant 27-day variations of CR were found not to correlate with those of other solar indices.

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