Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21347532c&link_type=abstract
American Astronomical Society, AAS Meeting #213, #475.32
Other
Scientific paper
The steady flux of cosmic rays entering the heliosphere provides a unique probe for studying the magnetic fields carried by the solar wind. Fluctuations in these magnetic fields produce an anti-correlation between cosmic ray intensities observed at Earth and the level of solar activity (solar modulation). Cosmic ray electrons and nuclei respond differently to solar modulation, with the differences being clearly related to reversals of the solar magnetic field, which occur every eleven years. If the large scale heliospheric magnetic field has certain types of structures, the charge sign of cosmic ray particles can affect their propagation. Careful study of the behavior of cosmic ray positrons, relative to negative electrons (which have identical masses) allows for a definitive separation of the effects due to charge sign from the other possible effects. As part of a on-going investigation of charge-sign dependence in solar modulation, cosmic ray positron fraction in the energy range of 0.6 to 4.5 GeV was measured on a NASA balloon flight from Kiruna, Sweden to Victoria Island, Canada during June 2-6, 2006. Measurements from this flight are compared to previous results and models.
Clem John
Evenson Paul
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