32nd International Cosmic Ray Conference, 2011

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Presentation transcript:

32nd International Cosmic Ray Conference, 2011 Heliospheric modulation of cosmic rays in the 23rd cycle and in previous cycles Gerasimova S.K., Gololobov P.Yu., Krivoshapkin P.A., Krymsky G.F., Starodubtsev S.A. Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy Siberian Branch of Russian Academy of Sciences, Yakutsk, Russia Contact email: ryu87@mail.ru

INTRODUCTION Long-term variations of the cosmic ray flux I by data of stratospheric measurements from st. Murmansk(Rc=0,6 GeV) and st. Moscow(Rc=2,4 GeV). And also the expected variations at these stations at k0=5.

IDEALIZED MODEL OF SOLAR CYCLE Transport equation Diffusion tensor Degree of magnetic field regularity Krymsky G.F., Krivoshapkin P.A., Mamrukova V.P.,et al., Journal of Experimental and Theoretical Physics, 2007, 104 (2): 189-195

IDEALIZED MODEL OF SOLAR CYCLE Krymsky G.F., Krivoshapkin P.A., Mamrukova V.P.,et al., Journal of Experimental and Theoretical Physics, 2007, 104 (2): 189-195

IDEALIZED MODEL OF SOLAR CYCLE Long-term variations of the cosmic ray flux I by data of stratospheric measurements from st. Murmansk(Rc=0,6 GeV) and st. Moscow(Rc=2,4 GeV). And also the expected variations at these stations at k0=5.

ANOMALY OF THE 23rd CYCLE Temporal change of the IMF intensity (a), level of the IMF turbulence (b)

ANOMALY OF THE 23rd CYCLE Temporal change of the number of solar spots Rz 9(a), index of Forbush-effects spectrum by data of muon telescopes of the Yakutsk spectrograph (b); index of Forbush-effects spectrum by data of the neutron monitor network (c).

ANOMALY OF THE 23rd CYCLE Stations 1965 2010 Observations, sm-2s-1 Theory, k0=5, sm-2s-1 Observations, Theory, k0=15, Murmansk 3.37 3.95 3.84 Moscow 2.76 2.82 3.11 3.08 Intensity of cosmic rays at Murmansk and Moscow during the period of solar activity minimum.

ANOMALY OF THE 23rd CYCLE Temporal change of cosmic ray flux I by data of stratospheric measurements in stations at Murmansk (0,6 GeV) and at Moscow (2,4 GeV) in the 21st (a) and 23rd (b) solar activity cycles

CONCLUSIONS Observations of cosmic rays are in agreement with the elementary theory of heliospheric modulation. The abnormal increase of cosmic rays at the 23rd cycle is caused by the decreased turbulence of interplanetary magnetic field.

In conclusions, the authors express gratitude for providing the stratospheric data of Moscow and Murmansk stations to Prof. Yu. I. Stozkhov et. al.

Thank you for attention!