Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh21b0116s&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH21B-0116
Physics
2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 2162 Solar Cycle Variations (7536), 7859 Transport Processes
Scientific paper
By analyzing data from a network of high-latitude neutron monitors,it is possible to derive the cosmic ray angular distribution with greater accuracy and much better time resolution than with the traditional method of analyzing diurnal variations observed by a single monitor. We report a new analysis of the cosmic ray steady-state anisotropy using the 11-station "Spaceship Earth" network (and subsets thereof in years before the full network was operational). From these measurements we extract detailed new information on radial and latitudinal gradients of cosmic ray density and the cosmic ray scattering mean free path near Earth. The anisotropy and its variation with the 11-year sunspot cycle and 22-year solar magnetic cycle provide a vital observational basis for testing theories of cosmic ray scattering and for understanding effects of drift and magnetic helicity in the solar modulation of Galactic cosmic rays. Supported by NSF grant ATM-0000315.
Bieber John W.
Evenson Paul
Pyle Roger
Shalchi Andreas
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