Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.ipa.nw.ru/conference/2002/sovet/PS/KOBLIC.PS Дата изменения: Mon Aug 19 15:47:19 2002 Дата индексирования: Tue Oct 2 06:34:00 2012 Кодировка: Поисковые слова: space sail

IAA Transactions, No. 8, ``Celestial Mechanics'', 2002
Solar sails as space--based screens against Earth's
climatic warming
V. Koblik 1 , E. Polyakhova 2
1 VISPA/Tuorla Observatory, Turku, Finland
2 Astronomical Institute, St. Petersburg University, Russia
Solar Sailing in space: nowadays problems and tomorrow prospects of eco­
logically pure means of space travelling are discussed. Solar Sailing --- unique
form of spacecraft propulsion which uses the solar radiation pressure, permits
to realize many space projects. Solar Sail --- a large lightweight sheet of thin
reflective synthetic film material reflecting the sunlight and drifting freely in
space. It can be used against global warming of the Earth by changing artificially
the solar radiation incident on the Earth 1:390 kW/m 2 (`solar constant' at the
Earth orbit distance). The radiation balance of the Earth is controlled by the
Stefan--Boltzmann law and yields T = 288 ffi K as the mean global temperature.
To compensate the global climatic warming about 2:5 ffi K (global secular increase
originating from the technogenetic greenhouse effect) we have to reduce the `solar
constant' by about 3:5%. How to do it?
The reduction 3:5% may be achieved with a minimum solar sail mirror area
of 4:5 \Theta 10 6 km 2 (tether of sail modulus) if a sail is positioned at L 1
--- collinear
inner libration point --- remaining on a straight line between the Sun and the
Earth at all time. The libration point L 1
position is determined by the pho­
togravitational three--body problem solution for the system Sun -- Earth -- solar
sail. Photogravitational L 1
--point is located outward the Sun comparatively to
the classic L 1 --point, the delay being dependent on solar sail area--to--mass ratio.
References
1. Koblik V. V., Polyakhova E. N., Sokolov L. L., Shmyrov A. S. Close Near--
Sun--Approaches Using Controlled Heliocentric Solar Sailing with Restric­
tions on Thermal Sail Capacity, Kosmicheskie Issledovaniya, 1996, 34, 618--
625 (in Russian). English translation: Controlled Solar Sailing Transfer
Flights into Near--Sun Orbit under Restrictions on Sail Temperature, Cosmic
Research, 34, 572--578.
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2. Koblik V. V., Polyakhova E. N., Sokolov L. L., Shmyrov A. S. Controlled So­
lar Sail Transfers to Near--Sun Orbits with Restrictions on Sail Temperature.
Journal of the Astronautical Sciences, 1999, 47, 189--206.
3. Koblik V. V., Polyakhova E. N., Sokolov L. L. Controlled Solar Sail Transfers
into Near--Sun Regions Combined with Planetary Gravity­Assist Flybys. Cel.
Mech. & Dyn. Astron. 2002 (submitted).
4. McInnes C. R. Solar Sailing: Technology, Dynamics and Mission Applica­
tions. Springer--Praxis Series in Space Sci. and Technol., Berlin, London,
1999.
5. Polyakhova E. N. Space Flight with a Solar Sail. M.: Nauka, 1986 (in Rus­
sian).
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