
Accession Number : ADA114738
Title : Calculation of Radiated Signals from HighAltitude Nuclear Detonations by Use of a ThreeDimensional Distribution of Compton Electrons
Descriptive Note : Interim rept.,
Corporate Author : RAND CORP SANTA MONICA CA
Personal Author(s) : Crain, Cullen M
PDF Url : ADA114738
Report Date : Mar 1982
Pagination or Media Count : 55
Abstract : This Note presents the essential details of a threedimensional method of calculating the radiated electromagnetic signal that is caused by magnetic deflections of a distribution of Compton electrons produced in the upper atmosphere by prompt gamma radiation from a highaltitude nuclear detonation or a series of detonations. The method differs from that previously developed for such calculations in that the solution is obtained from summing the radiation fields from the individual electrons in a threedimensional volume instead of combining the individual electron motions to determine a timeand spacedependent current from which the radiation field is evaluated using a one dimensional approximation to the solution of Maxwell equations. In the Note the effects of the time characteristics of the source gamma output, the effects of atmospheric scattering in reducing the coherent radiation from the Compton electrons, and the effect of residual atmospheric ionization (preionization) in reducing the observer signal amplitude are developed and illustrated numerically. The threedimensional characteristics of the source are brought out in illustrative numerical examples. These examples give additional physical insight into the source characteristics and demonstrate the importance of scattering and atmospheric ionization, when present, in influencing the EMP amplitude/time characteristics.
Descriptors : *ELECTROMAGNETIC PULSES, *ELECTROMAGNETIC SCATTERING, *EXPLOSION EFFECTS, *GAMMA RAYS, *IONOSPHERIC DISTURBANCES, *NUCLEAR EXPLOSIONS, COMPUTATIONS, MATHEMATICAL MODELS, THREE DIMENSIONAL
Subject Categories : Atmospheric Physics
Numerical Mathematics
Distribution Statement : APPROVED FOR PUBLIC RELEASE