Bewick, Russell and Lucking, Charlotte and Colombo, Camilla and Sanchez Cuartielles, Joan-Pau and McInnes, Colin (2011) Geo-engineering using dust grains in heliotropic elliptical orbits. In: 62nd International Astronautical Congress 2011, 2011-10-03 - 2011-10-07, Cape Town,.
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This paper examines the concept of a Saturn-like Earth ring comprised of dust grains to offset global warming. A new family of non-Keplerian periodic orbits, under the effects of solar radiation pressure and the Earth’s oblateness J2 perturbation, is selected to increase the lifetime of the passive cloud of particles and, thus, increase the efficiency of this geo-engineering strategy. An analytical model is used to predict the evolution of the dust due to solar-radiation pressure and the J2 effect. The attenuation of the solar radiation can then be calculated from the ring model. In comparison to circular orbits, eccentric orbits yield a more stable environment for small grain sizes and therefore achieve higher efficiencies when the orbital decay of the material is considered. Moreover, the special orbital dynamics experienced by high area-to-mass ratio objects, influenced by solar radiation pressure and the J2 effect, ensure the ring will maintain a permanent heliotropic shape, with dust spending the largest portion of time on the Sun facing side. It is envisaged that small dust grains can be released with an initial Δv to enter an eccentric orbit with Sun-facing apogee. Finally, an estimate of 5.94x1011 kg is computed as the total mass required to offset the effects of global warming.
|Item type:||Conference or Workshop Item (Paper)|
|Keywords:||global warming, non-Keplerian orbits, J2 effect, geo-engineering strategy, solar radiation pressure, eccentric orbits, heliotropic orbit, Mechanical engineering and machinery, Motor vehicles. Aeronautics. Astronautics|
|Subjects:||Technology > Mechanical engineering and machinery|
Technology > Motor vehicles. Aeronautics. Astronautics
|Department:||Faculty of Engineering > Mechanical and Aerospace Engineering|
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|Depositing user:||Pure Administrator|
|Date Deposited:||26 Sep 2012 09:49|
|Last modified:||16 Jun 2013 03:34|
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