Step-like variations of cosmic rays and their relation to an inclination of the heliospheric current sheet

Details Step-like variations of cosmic rays and their relation to an inclination of the heliospheric current sheet Step-like variations of cosmic rays and their relation to an inclination of the heliospheric current sheet

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3843s&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The large and fast step-like variations in the GCR intensity are examined during both the descending and recovery phases of the 20-23 solar cycles. The cosmic ray intensity data sets obtained in the stratospheric measurements in Murmansk, Mirny (Antarctica) and Moscow are used. At present the global merged interaction regions (GMIRs) are considered as a natural explanation of step-like intensity decreases. But the GMIRs are not suitable to explain the rapid intensity recovery that was as fast as the step-like decreases, for example in 1962, 1971, and 1991. According to the ULYSSES measurements, the IMF was much more disturbed within the sector zones. It means that the diffusion coefficient is smaller within the sector zone (just as inside the GMIR) than one beyond the sector zones. The changes of the heliospheric current sheet inclination cause the changes in the angular sizes of sector zones and due to that the fast decreases or increases of the GCR intensity. It is also shown that the intensity changes immediately after the step-decreases depend upon the IMF polarity. The cosmic ray intensity after the step-decrease tends to recover at 0>A and continues to decrease slowly at 0

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