LT RBR:. Long Term Radiation Belt Remediation. Joshua Davis ASTE 527 Space Concepts Studio. LT RBR:. RBR means removing the trapped electrons and ions from the near Earth environment for the benefit of manned and unmanned spacecraft. Radiation Environment’s Impact on Manned Spaceflight.
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Long Term Radiation Belt Remediation
Space Concepts Studio
RBR means removing the trapped electrons and ions from the near Earth environment for the benefit of manned and unmanned spacecraft.
Temporary and permanent eye damage.
A majority of the radiation Astronauts receive on orbit is attributed to the trapped radiation particles in the inner Van Allen belt.
Increased risk of cancers as well as heart, digestive, and respiratory diseases.
Career exposure cannot exceed 3 percent risk of exposure-induced death (REID) at a 95% confidence level.
The daily dosage of radiation on the ISS is equal to 8 chest X-rays per day.
Time on orbit is limited by an Astronaut’s total radiation exposure, limiting the ability to study long term micro-gravity effects on Humans.
Average annual exposure on the Earth’s surface is .125 rem/year, on board ISS during solar maximum is .1 rem/day
False stars in star tracker CCDs
Surface degradation from radiation
Solar array power decrease due to radiation damage
Electronics degrade due to total radiation dose
Solar array arc discharge
Single event effects in microelectronics: bit flips, fatal latch-ups
Spacecraft components become radioactive
Electromagnetic pulse from vehicle discharge
Cryogenic systems experience notable charged particle heating
Solar Panel Power Decrease
Bit Flips/Single Event Upsets
Video reconstructing belts with SAMPEX data from Oct 18, 2003 to Jan 1, 2004
Solar or Nuclear Events
Change the particle’s pitch cone angle such that its velocity vector is pointed roughly parallel to the magnetic field lines.
Very Low Frequency Radio Waves
Ambient flux conditions
Increase in loss-cone electron flux during VLF operation
“The overall primary objective of DSX is to resolve critical feasibility issues of injecting VLF waves into the magnetosphere to determine how efficiently, how effectively, and to what degree of efficacy this can be accomplished. The goal is to assess the particle distribution, perturbations, and scattering effects on the particles as a result of the VLF waves produced by nature and by man-made systems on the ground and in space.”
“It has been suggested that even a “small” HANE (~10–20 kilotons) occurring at altitudes of 125–300 km would raise peak radiation fluxes in the inner radiation belt by 3–4 orders of magnitude, and lead to the loss of 90% of all low-Earth-orbit satellites within a month [Dupont, 2004].”
“the manned space program would need to be placed on hold for a year or more”
Crippled 1/3 of operational satellites and disabled 7 satellites in the months that followed due to the particles injected into the radiation belts, some of which persisted for 5 years.
Rapid Remediation Occurs
Solar or Nuclear Event Occurs
Ionospheric Distortion Subsides
Ionospheric Distortion Begins
Enhanced Remediation vs. Natural Remediation
VLF ground based architecture study for geographic locations of interest
Feasibility study of Long Term operation of VLF stations (power, cost, effectiveness)
A Radiation Belt is
more stylish than
Ion-Cyclotron Turbulence Generation
The radiation belts work in a similar fashion, the more particles coming into the system, the more particles come out of the system.
However, particles in the belts can become stuck for months or years, so equilibrium takes a very long time to reach after an event.
Just as with the bucket, if there are no particles in the radiation belt, the protective magnetosphere is unaffected
Water is poured into the top of the bucket and exits through a porous plug at the bottom of the bucket.
If the rate of water being poured into the system increases, the water level rises until the pressure causes an equilibrium condition
If there is no water, there is still a bucket.