The Use of Magnetic Fields in the Elimination of the Re-Entry Radio Blackout

Hodara, H.

doi:10.1109/jrproc.1961.287709

Cited by 79 publications

(35 citation statements)

References 4 publications

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“…The 'blackout' leads to risks on space missions and air-breathing hypersonic flights in the near space. In order to mitigate the 'blackout' problem, many approaches have been suggested, for example, aerodynamic shaping [4], 'magnetic window' [5], electrophilic ejection [6], high frequency communication and repeater satellite communication [7]. All of those approaches have technical or practical limitations, such as cost, system weight and aerodynamic performance.…”

Section: Introductionmentioning

confidence: 99%

Studies of Terahertz Wave Propagation in Realistic Reentry Plasma Sheath

Chen¹,

Yuan²,

Shen³

et al. 2016

PIER

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Abstract-Communication 'blackout' is a big challenge for modern space engineering. In the recent decade, the terahertz (THz) technology is believed to be an effective solution for the 'blackout' problem. Many research works about the transmission of THz waves in plasma slabs have been carried out. According to those works, the radio attenuation of THz waves in plasma slabs strongly depends on thickness of the slab, electron density, electron collision frequency and temperature. However, few previous works have paid attention to realistic reentry plasma sheath. In the present paper, a hypersonic fluid model is introduced in order to investigate the structure of the realistic plasma sheath which covers a blunt coned vehicle. The scattering matrix method is employed to study the transmission of THz waves in realistic plasma sheath. According to the present study, the wave frequency, electron density and collision frequency are the most significant factors which determine the attenuation of the THz waves in the plasma sheath. Since the whole plasma sheath is inhomogeneous, to install the antenna at an appropriate position helps mitigate the 'blackout'. For the blunt coned reentry vehicle, installing the antenna on the wall close to the bottom is helpful for mitigating the 'blackout' problem.

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Section: Introductionmentioning

confidence: 99%

Studies of Terahertz Wave Propagation in Realistic Reentry Plasma Sheath

Chen¹,

Yuan²,

Shen³

et al. 2016

PIER

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“…Hodara proposed the external magnetic field can slow down attenuation of the right-hand circularly polarized electromagnetic wave in plasma [12]. Starkey theoretically analyzed the effects of external magnetic field on propagation of right-hand circularly polarized electromagnetic wave in plasma when the wave frequency is 10 GHz and 20 GHz [13].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Studies of Magnetic Field on Electromagnetic Wave Propagation in Plasma

Xing¹,

Zhao²,

Liang³

2013

PIER M

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Abstract-A spacecraft will experience the well-known "blackout" problem in the re-entry into the Earth's atmosphere, which results in communication failures between the spacecraft and ground control center. It is important to study the blackout mitigation method. The effects of external magnetic field on electromagnetic wave propagation in plasma are studied by theoretical and experimental methods in this paper. The numerical results show that the attenuation of electromagnetic wave in plasma is reduced by the presence of a magnetized field. The propagation properties of electromagnetic wave in unmagnetized and magnetized plasma have been studied experimentally with plasma torch, and the experimental results are in good agreement with the theory. Both the theoretical and experimental results indicate that magnetic window is an alternative and promising way to improve the radio blackout issue.

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“…The created plasma layer usually has a high electron number density, 10 15 to 10 19 m -3 , which is subject to the geometry of a vehicle and the flight trajectory [1,2]. The high electron number density causes negative effects on the operation of a vehicle, particularly for its communications because radio waves transmitted from or to a vehicle are reflected or attenuated against the plasma layer [3]. Therefore, the communication of a vehicle is temporarily interrupted, which is known as communication or radio blackout.…”

Section: Introductionmentioning

confidence: 99%

Plasma manipulation using a MHD-based device for a communication blackout in hypersonic flights

Kim

Gülhan

2011

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011

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When a vehicle flies with hypersonic velocity, a weakly ionized plasma layer is generated around the vehicle due to the shock heated air. Since the created plasma layer has a high electron number density, the vehicle has a communication difficulty known as radio blackout. In this study, we propose an innovative concept of a mitigation scheme based on MHD. The proposed mitigation scheme uses an ExB layer to manipulate the plasma density in a specific region during hypersonic flights. Due to the reduced electron number density in the plasma layer, it provides the possibility for communication during radio blackout.

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The Use of Magnetic Fields in the Elimination of the Re-Entry Radio Blackout

Cited by 79 publications

References 4 publications

Studies of Terahertz Wave Propagation in Realistic Reentry Plasma Sheath

Studies of Terahertz Wave Propagation in Realistic Reentry Plasma Sheath

Theoretical and Experimental Studies of Magnetic Field on Electromagnetic Wave Propagation in Plasma

Plasma manipulation using a MHD-based device for a communication blackout in hypersonic flights

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