Interplanetary magnetic field polarities inferred from the north-south cosmic ray anisotropy

Details Interplanetary magnetic field polarities inferred from the north-south cosmic ray anisotropy Interplanetary magnetic field polarities inferred from the north-south cosmic ray anisotropy

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1069l&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A2, pp. SSH 4-1, CiteID 1069, DOI 10.1029/2002JA009509

Physics

4

Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Solar Cycle Variations (7536), Interplanetary Physics: Energetic Particles, Heliospheric (7514)

Scientific paper

The interplanetary magnetic field sector polarity at the Earth's location can be inferred from ground measurements of the cosmic ray north-south anisotropy. We present here the results of a systematic comparison between inferred and directly measured polarities in the period from January 1971 through December 1997. The overall success rate of the prediction method is 72%, in rather good agreement with previous findings. On the other hand, our analysis shows for the first time the limits of the method and calls for warning in its use. In fact, it turns out that the inferred polarities are affected by a bias, which becomes more relevant around the sunspot minimum. Even though the bias cannot be removed, it is possible to select conditions, occurring for 30% of the time, under which the inferred polarities are very reliable (the success rate being 95%).

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