The Radiation Environment Impacting DSX Orbit Options

Ginet, G. P.

doi:10.21236/ada455162

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…Raytracing starts with a model to estimate the propagating wave vectors and Poynting flux injected into the magnetosphere from an in situ dipole antenna. The model employs the stationary phase, far-field approximation to obtain a solution to the Green's function for the electric and magnetic fields driven by the antenna current in the limit of cold-plasma linear response theory (Mittra and Deschamps 1963;Ginet 2020). Estimates of the wave vectors and Poynting flux are output on the surface of a sphere of constant radius (100 km) assuming a homogeneous plasma.…”

Section: Resultsmentioning

confidence: 99%

Space-to-space very low frequency radio transmission in the magnetosphere using the DSX and Arase satellites

McCollough

Miyoshi

Ginet

et al. 2022

Earth Planets Space

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Very low frequency (VLF) waves (about 3–30 kHz) in the Earth’s magnetosphere interact strongly with energetic electrons and are a key element in controlling dynamics of the Van Allen radiation belts. Bistatic very low frequency (VLF) transmission experiments have recently been conducted in the magnetosphere using the high-power VLF transmitter on the Air Force Research Laboratory’s Demonstration and Science Experiments (DSX) spacecraft and an electric field receiver onboard the Japan Aerospace Exploration Agency’s Arase (ERG) spacecraft. On 4 September 2019, the spacecraft came within 410 km of each other and were in geomagnetic alignment. During this time, VLF signals were successfully transmitted from DSX to Arase, marking the first successful reception of a space-to-space VLF signal. Arase measurements were consistent with field-aligned propagation as expected from linear cold plasma theory. Details of the transmission event and comparison to VLF propagation model predictions are presented. The capability to directly inject VLF waves into near-Earth space provides a new way to study the dynamics of the radiation belts, ushering in a new era of space experimentation. Graphical Abstract

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Section: Resultsmentioning

confidence: 99%

Space-to-space very low frequency radio transmission in the magnetosphere using the DSX and Arase satellites

McCollough

Miyoshi

Ginet

et al. 2022

Earth Planets Space

View full text Add to dashboard Cite

show abstract

“…Ginet (2020) used a stationary phase far‐field approximation to obtain a solution to the Green's function for the electric and magnetic fields radiated from the DSX antenna. In the cold plasma approximation these fields tend to infinity at the resonance cone, so an ad hoc approach was derived that limits their magnitude.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Boomerang Whistler‐Mode Waves Emitted From the DSX Spacecraft

et al. 2023

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The Air Force Research Laboratory's Demonstration and Science Experiments (DSX) spacecraft carried a high‐voltage very low frequency transmitter and a sensitive broadband receiver to medium Earth orbit in 2019. During many pulsed transmission experiments, DSX detected apparent “boomerang” echoes when its emitted waves refracted in the magnetosphere and returned to the spacecraft. We simulated a series of these detected pulses using cold plasma ray tracing to characterize their likely wavelengths, indices of refraction, and initial wave normal angles. The waves were shown to remain relatively local to DSX, to be lightly damped, and to have a wide variety of wavelengths and indices of refraction, but they were all emitted with very oblique wave normal angles tightly clustered about half a degree from the Gendrin angle, which theoretical antenna models predict is preferentially excited. Our results are remarkably consistent with this prediction but are statistically biased closer to the resonance cone, possibly because of limitations in the ray tracing technique. The result is robust to perturbations of the simulation and confirms a very narrow beam of oblique radiation quite unlike the behavior of a dipole in vacuo.

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“…The Wave Particle Interaction Experiment (WPIx) explored the injection, propagation, amplification, and natural distribution of VLF waves in the magnetosphere. Questions addressed included the radiation pattern, sheath effects on antenna impedance, linear and nonlinear amplification, and the generation of triggered emissions (Ginet, 2020; Song et al., 2021). It further explored the interaction of such VLF waves with trapped radiation belt electrons, particularly resonance‐induced losses of such particles.…”

Section: Dsx Science Experiments Suitesmentioning

confidence: 99%

Overview of the Demonstration and Science Experiments (DSX) Mission

et al. 2023

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The Air Force Research Laboratory's Demonstration and Science Experiments (DSX) mission investigated wave‐particle interactions and the particle and space environment in Medium Earth Orbit (MEO) from June 2019 to May 2021. Its Wave‐Particle Interactions Experiment conducted over 1,300 active high power very low frequency transmissions in the radiation belts providing observations of antenna performance and signal propagation from a controlled source. This included hundreds of transmissions while in magnetic conjunction with other satellites. The Loss Cone Imager and Space Weather Experiment suite observed electron and proton populations over a wide energy range, with several of these instruments providing pitch‐angle resolution. The Space Environmental Effects Experiment investigated effects of the MEO environment on electronics and materials. The Adaptive Controls Experiment demonstrated technology for on‐board identification and control of large structure vibrational modes. We describe the DSX instrument capabilities and on orbit performance, science planning and operations for carrying out an array of active and passive experiments, and some initial results in brief. We also describe plans for further work and data release.

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The Radiation Environment Impacting DSX Orbit Options

Cited by 4 publications

References 5 publications

Space-to-space very low frequency radio transmission in the magnetosphere using the DSX and Arase satellites

Space-to-space very low frequency radio transmission in the magnetosphere using the DSX and Arase satellites

Characteristics of Boomerang Whistler‐Mode Waves Emitted From the DSX Spacecraft

Overview of the Demonstration and Science Experiments (DSX) Mission

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