Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh21a..03b&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH21A-03
Other
2104 Cosmic Rays, 2114 Energetic Particles (7514), 7845 Particle Acceleration, 7984 Space Radiation Environment
Scientific paper
Within a 6-minute span on January 20, 2005, the count rate of the high-altitude neutron monitor at South Pole increased by a factor of 56. This was the largest increase of cosmic radiation ever recorded on the surface of Earth. Normalized to sea level, the event was second only to the famous 1956 ground level enhancement. The event was enormously anisotropic, as high-latitude stations outside Antarctica recorded an increase roughly a factor of 10 smaller. We employ observations from the Spaceship Earth network and other neutron monitors to derive the time profile, anisotropy, and energy spectrum of relativistic solar protons on January 20, 2005. We also model the event based upon the Boltzmann equation and conclude that this event may have featured a rare instance of wave excitation and nonlinear transport from streaming relativistic protons. Supported by NSF grant ATM-0000315, by the Thailand Research Fund, and by the Rachadapisek Sompoj Fund of Chulalongkorn University.
Bieber John W.
Clem James
Duldig Marc
Evenson Paul
Humble John
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