Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa31a0345f&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA31A-0345
Physics
2407 Auroral Ionosphere (2704), 2455 Particle Precipitation, 2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431), 2778 Ring Current
Scientific paper
Global energetic proton precipitation patterns during the 16-18 April 2002 magnetic storm events were generated using newly-developed data products of MEPED instruments onboard the NOAA-15 and -16 satellites. The observational data set was first sorted in 1-degree CML and 8-minute MLT bins. To achieve global coverage, the missing MLT data were then filled by interpolation techniques in each 1-degree CML interval. Four spatial interpolation approaches were carried out and compared: cosine or linear fits to data points or MLT bin averages. The resulting global proton precipitation maps, available on a 3-hour cadence, provide new information on the development and variability in the structure of incident high energy protons on a time scale commensurate with ring current growth and decay. The geoeffectiveness of 30-240 keV proton injection was assessed by running our newly-developed three-dimensional Monte Carlo ion transport model. The global characteristics of the resulting ionization and heating rates are presented. The disturbances resulted from proton precipitation were coupled into a global ionosphere-thermosphere model developed at the University of Michigan. For the first time using in situ particle flux measurements, we can examine on a planetary scale the proton role in the geoeffectiveness of storm-time particle precipitation on the thermosphere-ionosphere system. The times and places where protons significantly contribute to geoeffectiveness are described. The effect of lateral spreading of the precipitating particles is examined and discussed.
Evans Silvan D.
Fang Xiao
Kozyra Janet U.
Liemohn Michael W.
Ridley Aaron J.
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