IEEE Organizations related to Space Radiation

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Periodicals related to Space Radiation

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Most published Xplore authors for Space Radiation

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Xplore Articles related to Space Radiation

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The CRaTER special issue of space weather: Building the observational foundation to deduce biological effects of space radiation

Space Weather, 2013

The United States is preparing for exploration beyond low-Earth Orbit (LEO). However, the space radiation environment poses significant risks. The radiation hazard is potentially severe but not sufficiently well characterized to determine if long missions outside LEO can be accomplished with acceptable risk [Cucinotta et al., 2001; Schwadron et al., 2010; Cucinotta et al., 2010]. Radiation hazards may be over-or ...


Self-Adaptive High Anti-Radiation EDFA for Space Optical Communication Systems

Journal of Lightwave Technology, 2015

In a space optical communication system with an amplification sub-system, the performance of the erbium-doped fiber amplifier (EDFA) will worsen due to the effect of space radiation. Consequently, the EDFA will not work under its optimal state which has been already designed on the ground. To fix this problem, a study on the basic characteristics of EDFA under radiation is ...


A New Space Radiation Suppression Algorithm for Space-Based Optical Image

2017 4th International Conference on Information Science and Control Engineering (ICISCE), 2017

Space-based optical images are mainly affected by space radiation, sky glow background and CCD noise interference, in which space radiation noise can seriously interfere with the subsequent target detection. In this paper, we propose a space radiation interference suppression algorithm based on multi- feature, and compare with three algorithms which are commonly used to eliminate radiation noise: a Laplacian edge ...


Phase-Space Dynamic of Coherent Wave-Particle Interaction in the Radiation Belts

2019 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM), 2019

Modeling the interaction between coherent whistler mode waves and radiation belt electrons is an important component of space weather dynamics. Two main aspects of the wave-particle interaction are, the amplification of coherent VLF waves by an unstable radiation belt electron distribution and the precipitation and/or acceleration of these particles by the waves. The solution of the full problem requires a ...


Space Radiation Environment Testing of Liquid Crystal Phase Shifter Devices

IEEE Antennas and Wireless Propagation Letters, 2016

This letter presents a reconfigurable phase shifter based on liquid crystal (LC) technology for use in space applications. A tunable phase shifter for the Ka-band is discussed and described in detail in terms of performance and functionality. The focus of this letter is placed on the performance of liquid crystals in lab-simulated space radiation conditions including surface charging, X-ray, and ...


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Educational Resources on Space Radiation

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IEEE-USA E-Books

  • The CRaTER special issue of space weather: Building the observational foundation to deduce biological effects of space radiation

    The United States is preparing for exploration beyond low-Earth Orbit (LEO). However, the space radiation environment poses significant risks. The radiation hazard is potentially severe but not sufficiently well characterized to determine if long missions outside LEO can be accomplished with acceptable risk [Cucinotta et al., 2001; Schwadron et al., 2010; Cucinotta et al., 2010]. Radiation hazards may be over-or under-stated through incomplete characterization in terms of net quantities such as accumulated dose. Time- dependent characterization often changes acute risk estimates [NCRP, 1989; Cucinotta, 1999; Cucinotta et al., 2000; George et al., 2002]. For example, events with high accumulated doses but sufficiently low dose rates (<30 rad/h) pose significantly reduced risks. Protons, heavy ions, and neutrons all contribute significantly to the radiation hazard. However, each form of radiation presents different biological effectiveness. As a result, quality factors and radiation-specific weighting factors are needed to assess biological effectiveness of different forms of radiation [e.g., NCRP 116, 1993] (Figure 1). More complete characterization must account for time- dependent radiation effects according to organ type, primary and secondary radiation composition, and acute effects (vomiting, sickness, and, at high exposures, death) versus chronic effects (such as cancer).

  • Self-Adaptive High Anti-Radiation EDFA for Space Optical Communication Systems

    In a space optical communication system with an amplification sub-system, the performance of the erbium-doped fiber amplifier (EDFA) will worsen due to the effect of space radiation. Consequently, the EDFA will not work under its optimal state which has been already designed on the ground. To fix this problem, a study on the basic characteristics of EDFA under radiation is conducted. In the simulation tests, the gain of EDFA and the optimal length of the erbium-doped fiber both decrease with the dose of radiation. To dynamically adapt to such effects, a new self-adaptive system is established and makes an improvement of 7 dB in the gain when the radiation dose reaches 5000 Gy. This paper can practically benefit the design of the space optical communication systems.

  • A New Space Radiation Suppression Algorithm for Space-Based Optical Image

    Space-based optical images are mainly affected by space radiation, sky glow background and CCD noise interference, in which space radiation noise can seriously interfere with the subsequent target detection. In this paper, we propose a space radiation interference suppression algorithm based on multi- feature, and compare with three algorithms which are commonly used to eliminate radiation noise: a Laplacian edge detection algorithm, a fast algorithm based on histogram and a rank-ordered absolute difference (ROAD) algorithm. The experimental results show that the proposed algorithm can quickly and effectively eliminate space radiation noise.

  • Phase-Space Dynamic of Coherent Wave-Particle Interaction in the Radiation Belts

    Modeling the interaction between coherent whistler mode waves and radiation belt electrons is an important component of space weather dynamics. Two main aspects of the wave-particle interaction are, the amplification of coherent VLF waves by an unstable radiation belt electron distribution and the precipitation and/or acceleration of these particles by the waves. The solution of the full problem requires a numerical self-consistent code which captures both effects simultaneously. Unfortunately, self-consistent codes of nonlinear phenomena are computationally intensive and the results can be challenging to interpret. To quantify the effect of waves on particles, we employ a novel approach wherein the particle trajectories are traced backward in time. The validity of this method is based on conservation of phase space density formalized in Liouville's theorem. The model resolves in high resolution the formation of a depletion in the region of phase-space known as a phase space hole that is associated with nonlinear wave growth.

  • Space Radiation Environment Testing of Liquid Crystal Phase Shifter Devices

    This letter presents a reconfigurable phase shifter based on liquid crystal (LC) technology for use in space applications. A tunable phase shifter for the Ka-band is discussed and described in detail in terms of performance and functionality. The focus of this letter is placed on the performance of liquid crystals in lab-simulated space radiation conditions including surface charging, X-ray, and gamma radiation effects. Test results suggest that liquid crystal is quite resilient to adverse effects from the space radiation environment.

  • Simulation study of the whistler-mode chorus generation in the Earth's inner magnetosphere

    Whistler-mode chorus emissions play crucial roles in the evolution of radiation belt electrons. Chorus emissions are coherent electromagnetic plasma waves with varying frequencies in the typical frequency range of 0.2 to 0.8 fce0, where fce0 is the electron gyrofrequency at the magnetic equator. They often have a gap at half the local cyclotron frequency. The generation process of chorus has been explained by the nonlinear wave growth theory [see review by Omura et al., 2012] and has been reproduced by self-consistent numerical experiments [e.g., Katoh and Omura, 2007, 2011, 2013, 2016; Katoh et al., 2018]. In the present study, we investigate dependencies of the chorus generation process on properties of energetic electrons, the background magnetic field, and the thermal plasma condition. First, we conduct a series of electron hybrid simulations for different temperature anisotropy (AT) of the initial velocity distribution function of energetic electrons. We vary AT in the range from 3 to 9 with changing the number density of energetic electrons (Nh) so as to study whether distinct rising-tone chorus emissions are reproduced or not in the assumed initial condition. Simulation results reveal that Nh required for the chorus generation decreases as the temperature anisotropy of energetic electrons increases. We also find that reproduced spectra become hiss-like for large Nh cases. Next, we carry out simulations by changing the spatial gradient of the background magnetic field intensity along a field line. Simulation results clarify that the small magnetic field gradient lowers the threshold amplitude for the chorus generation. These simulation results demonstrate the validity of the nonlinear wave growth theory and suggest that the coherent nonlinear wave-particle interaction is essential for generation of whistler-mode chorus emissions in the magnetosphere.

  • Review the space radiation CVD diamond multi-layer detector

    The review highlights the parameters of multilayer diamond detector for monitoring space radiation based on CVD diamond technique. The paper specifies the results of measuring charge output spectrum of single and double layer diamond detectors. Diamond detector serves to on-board radiation monitoring systems of spacecraft having lifetime increase in up to 20–25 years. The use of a diamond detector multi-layer structure makes it possible to enhance the amplitude of charge output spectrum, to expand the detector dynamic range, as well as to improve the accuracy and information content of radiation monitoring systems.

  • Total ionizing dose test facilities for micro-electronic circuits

    This paper describes the total ionizing dose test facility available at the University of Saskatchewan. Two Co-60 sources are available one for high and the other low dose rate radiation effects testing of electronics. The total ionizing dose performance of an operation amplifier was evaluated. The testing results compare well with previously published results.

  • Simulation of space-based observed star map in space radiation environment

    Due to the speciality of space environment for the observation system, the observed images are interfered by space radiation noise to some extent. To improve the reality of image simulation, we propose a new method of star map simulation with space radiation effect in this paper. First of all, basic star map simulation is realized in this paper. Both star position and lightning magnitude are calculated and modeled. And point diffusion is considered. Then, with the CCD imaging theory, space radiation effects on star map are calculated and modeled. The result indicates that this method can effectually simulate the space-based observed star map in radiation environment.

  • Protecting lunar colonies from space radiation

    When Apollo 7 astronaut Walter Cunningham blasted off from Earth on 11 October 1968, the last thing he was thinking about was radiation risks or any risks at all. “Fear doesn't even enter your mind because you have confidence in yourself, your own ability, your training, and your knowledge,” Cunningham told Space Weather.



Standards related to Space Radiation

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