Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998sct..conf..107u&link_type=abstract
Proceedings of the 6th Spacecraft Charging Conference. November 2-6, 1998. AFRL Science Center, Hanscom AFB, MA, USA., p.107-110
Physics
Scientific paper
We examined the radio blackout of a reentry vehicle by performing electromagnetic PIC (Particle-In-Cell) simulations. We focused on (1) blackout phenomenon and its avoidance with static magnetic field applied to the plasma, and (2) measurement of the reentry plasma layer with radio waves. Regarding (1), we could clearly show that the radio blackout occurs when the plasma frequency of reentry plasma exceeds the frequency of radio wave emitted from the vehicle. To avoid the radio blackout, we applied static magnetic field to the reentry plasma, which modifies the wave dispersion relation. We found that the radio waves can penetrate the reentry plasma mainly by whistler mode. Regarding (2), we found that the reflectometry method is applicable to the estimate of the spatial profile of the plasma layer, which utilizes the information of phase difference between the waves emitted from the antenna and reflected against the plasma layer. We can also obtain the maximum plasma density by searching for abrupt decrease in the field spectra of the reflected waves.
Matsumoto Haru
Takenaka S.
Usui Hidetomo
Yamane M.
Yamashita Fujio
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