Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..858..104s&link_type=abstract
PHYSICS OF THE INNER HELIOSHEATH: Voyager Observations, Theory, and Future Prospects; 5th Annual IGPP International Astrophysics
Astronomy and Astrophysics
Astrophysics
2
Heliopause And Solar Wind Termination, Cosmic Rays, Interplanetary Magnetic Fields
Scientific paper
The correlation between galactic cosmic ray intensity (j) and the inclination or tilt angle (α) of the heliospheric current sheet is used to test the cosmic ray drift model that predicts cosmic ray intensity varies more with tilt angle for negative than positive polarity of the heliospheric magnetic field (P). Three solar cycles with three changes in polarity are examined. Plots of j vs. α lead to open contours with a clockwise rotation for both +/- and -/+ cycles contrary to expectation. A major influence is the different dependence of j on α for the asymmetric onset or descending (D) phase and the recovery or ascending (A) phase. Thus, j is a function of α, P and A or D. A hierarchy of dependences is apparent in the j-α contours that reveals the greater influence of α for P<0 than for P>0 in agreement with drift models. However, the models can be improved by including the dependence on modulation phase (A/D) that may result from a time-dependent α that gradually increases (decreases) during the descending (ascending) phase from the outer heliosphere to the Sun.
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