Study of solar modulation of galactic cosmic rays with the PAMELA and ARINA spectrometers in 2006-2012. Journal of Physics: Conference Series Volume 409, Issue 1, 2013, Article number 012194

Spectrometers PAMELA and ARINA, mounted on the spacecraft Resurs-DK1, carried out precision measurements of galactic cosmic ray (GCR) flux near the Earth from 2006 to present. Combining these instruments gives the possibility to study the effect of solar modulation in the energy range from 30 MeV to dozens of GeV. This report presents experimental results concerning the time interval from the end of the 23rd solar cycle (noted by an prolonged minimum) to the beginning of the 24th cycle. The cosmic ray flux raised up to the end of 2009, then it began to decline, which is in coincidence with the sunspot number and evidence of the solar activity increasing. Some additional features were noted in the time profile of galactic cosmic ray flux, which, as shown by analysis of the correlation, correspond to a change of such heliospheric parameters as the tilt angle of the heliospheric current sheet (HCS), the solar wind velocity and the intensity of interplanetary magnetic field (IMF).



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Indexed keywords

Cosmic ray flux; Energy ranges; Galactic cosmic rays; Heliospheric current sheet; Interplanetary magnetic fields; Precision measurement; Solar activity; Solar cycle; Solar modulation; Solar wind velocity; Sunspot number; Tilt angle; Time interval