The deployment of the flyers is an issue that requires reusable rockets. Such a group of sunshades would need to occupy an area of about 3.8 million square kilometers if placed at the L1 point. By using the solar radiation pressure on the mirrors as solar sails and tilting them in the right direction, the flyer will be capable of altering its speed and direction to keep in position. A suggested solution is to place mirrors capable of rotation on the surface of the flyers. The remaining solar pressure and the fact that the L1 point is one of unstable equilibrium, easily disturbed by the wobble of the Earth due to gravitational effects from the Moon, requires the small autonomous flyers to be capable of maneuvering themselves to hold position. An optical prototype has been constructed by Roger Angel with funding from NIAC. This minimizes the effect of solar radiation pressure on the units, requiring less effort to hold them in place at the L1 point. The individual autonomous flyers building up the cloud of sunshades are proposed not to reflect the sunlight but rather to be transparent lenses, deflecting the light slightly so it does not hit Earth. Such a group of small sunshades that blocks 2% of the sunlight, deflecting it off into space, would be enough to halt global warming, giving ample time to cut emissions back on Earth. The mass of each disk would be about a gram, adding up to a total of almost 20 million tonnes. Each disk is proposed to have a 0.6-meter diameter and a thickness of about 5 micrometers. ![]() One proposed sunshade would be composed of 16 trillion small disks at the Sun-Earth L1 Lagrangian point, 1.5 million kilometers above Earth. Designs for planetary sunshade Cloud of small spacecraft Issues included the large amount of material needed to make the disc and also the energy to launch it to its orbit. His design involved making a large glass (2,000 km) occulter from lunar material and placing at the L1 point. In 1989, James Early proposed a space-based sun-shade to divert sunlight at the planetary level. Most such proposals contemplate a blocking element at the Sun-Earth L1 Lagrangian point. ![]() Proposed shade designs include a single-piece shade and a shade made by a great number of small objects. Sunshades could also be used to produce space solar power, acting as solar power satellites. Heightened interest in such projects reflects the concern that internationally negotiated reductions in carbon emissions may be insufficient to stem climate change. Space mirrors in orbit around the earth with a diameter of 100 to 300 km, as designed by Hermann Oberth, are intended to focus sunlight on indiviual regions oft he earth’s surface or deflect it into space so that the solar radiation is weakened in a specifically controlled manner for individual regions on the earth’s surface.įirst proposed in 1989, another space sunshade concept involves putting a large occulting disc, or technology of equivalent purpose, between the Earth and Sun.Ī sunshade is of particular interest as a climate engineering method for mitigating global warming through solar radiation management. The concept of the construction of sunshade as a method of climate engineering dates back to the years 1923,1929, 19 by the physicist Hermann Oberth. Light can be diverted by different methods. Spacecraft shield to reduce starlight and irradiationĪ space sunshade or sunshield is a parasol that diverts or otherwise reduces some of the Sun's radiation, preventing it from hitting a spacecraft or planet and thereby reducing its insolation, which results in reduced heating.
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