Accession Number : AD0783246

Title :   Propagated EMP from Tangent and Buried Bursts.

Descriptive Note : Final rept. Mar-Dec 73,

Corporate Author : AIR FORCE WEAPONS LAB KIRTLAND AFB N MEX

Personal Author(s) : Brau,James E. ; Canavan ,Gregory H. ; Wittwer, Leon A. ; Greene,Arthur E.

Report Date : JUL 1974

Pagination or Media Count : 30

Abstract : Calculations describing the ionospheric propagation of high-altitude electromagnetic pulses (EMP) to satellite altitudes are reported. Both tangent and buried burst scenarios are treated. The calculations are based on the AFWL CHEMP code for self-consistent calculations of radiated EMP, modified by the inclusion of a swarm treatment of secondary and ionospheric electrons. The region of applicability of this swarm treatment has been determined by a separate Monte Carlo calculation. By carrying the calculations all the way from the burst point through the E region, the authors are able to account fully for the D region heating, the increased absorption and cascading it produces, and the increased cutoff frequency which results. The code calculations are evaluated for sensitivity to the ambient ionospheres used. (Author)

Descriptors :   *Electromagnetic pulses, *Ionospheric propagation, *Nuclear explosions, *Ionospheric modification, Electron density, Electron energy, Heating, Fourier transformation, Monte Carlo method

Subject Categories : Atmospheric Physics
      Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE