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Accurate spin axes and solar system dynamics: climatic variations for the Earth and Mars
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Responsible organisation
2002 (English)In: Astronomy & Astrophysics, ISSN 0004-6361, Vol. 384, no 2, 689-701 p.Article in journal (Refereed) Published
Abstract [en]

Celestial mechanical simulations from a purely classical point of view of the solar system, including our Moon and the Mars moons {Phobos and Deimos {are carried out for 2 millions of years before present. Within the classical approximation, the results are derived at a very high level of accuracy. Effects from general relativity for a number of variables are investigated and found to be small. For climatic studies of about 1 Myr, general relativity can safely be ignored. Three different and independent integration schemes are used in order to exclude numerical anomalies. The converged results from all methods are found to be in complete agreement. For verification, a number of properties such as spin axis precession, nutation, and orbit inclination for Earth and Mars have been calculated. Times and positions of equinoxes and solstices are continously monitored. As also observed earlier, the obliquity of the Earth is stabilized by the Moon. On the other hand, the obliquity of Mars shows dramatic variations. Climatic influences due to celestial variables for the Earth and Mars are studied. Instead of using mean insolation as in the usual applications of Milankovitch theory, the present approach focuses on the instantaneous solar radiation power (insolation) at each summer solstice. Solar radiation power is compared to the derivative of the icevolume and these quantities are found to be in excellent agreement. Orbital precessions for the inner planets are studied as well. In the case of Mercury, it is investigated in detail.

Place, publisher, year, edition, pages
2002. Vol. 384, no 2, 689-701 p.
Keyword [en]
celsetial mechanics, astrophysics, spin axes, Earth, Mars, Methods: N-body simulations, Planets and satellites: general, Relativity, Solar system: general
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:miun:diva-1886DOI: 10.1051/0004-6361:20020029ISI: 000174253000033Scopus ID: 2-s2.0-0036495991Local ID: 698OAI: oai:DiVA.org:miun-1886DiVA: diva2:26918
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2016-10-17Bibliographically approved

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Edvardsson, SverkerEngholm, Magnus
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
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  • asciidoc
  • rtf