Imprint of Galactic dynamics on Earth's climate

被引：34
|
作者：
Svensmark, H. [1 ]
机构：
[1] Danish Natl Space Ctr, Ctr Sun Climate Res, DK-2100 Copenhagen O, Denmark
来源：
ASTRONOMISCHE NACHRICHTEN | 2006年 / 327卷 / 09期
关键词：
Galaxy : kinematics and dynamics; Earth;
D O I：
10.1002/asna.200610650
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A connection between climate and the Solar system's motion perpendicular to the Galactic plane during the last 200 Myr years is studied. An imprint of galactic dynamics is found in a long-term record of the Earth's climate that is consistent with variations in the Solar system oscillation around the Galactic midplane. From small modulations in the oscillation frequency of Earth's climate the following features of the Galaxy along the Solar circle can be determined: 1) the mass distribution, 2) the timing of two spiral arm crossings (31 Myr and 142 Myr) 3) Spiral arm/interarm density ratio (rho(arm)/rho(interarm) approximate to 1.5-1.8), and finally, using current knowledge of spiral arm positions, a pattern speed of Omega(P) = 13.6 +/- 1.4 km s(-1) kpc(-1) is determined. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
引用
收藏
页码：866 / 870
页数：5
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