Accession Number:

AD0668162

Title:

RADIO PROPAGATION IN RE-ENTRY PLASMAS,

Descriptive Note:

Corporate Author:

BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH PLASMA PHYSICS LAB

Personal Author(s):

Report Date:

1967-10-01

Pagination or Media Count:

18.0

Abstract:

Altitude versus speed profiles for space ships entering earths atmosphere from orbit, from the moon, and from a planet were used to estimate plasma and collision frequencies in the stagnation and expansion regions. The lunar and planetary profiles are shown to result in plasmas dominated by non-local conductivity. Weibels analysis is adapted to apply for whistler mode propagation in a plasma with a magnetic field. The B field produced by a ferrite radio window 250 gauss 10 cm from its pole face is used to calculate the attenuation parameter of a 100 MHz telemetry signal. It is found that the radio blackout along the orbital re-entry profile is eliminated for these parameters. However, this is not so for the lunar and planetary re-entry profiles. It would require about twenty-five times as much B field to cure these blackout blues. Author

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics
  • Spacecraft Trajectories and Reentry
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE