The sun's motion perpendicular to the galactic plane

Details The sun's motion perpendicular to the galactic plane The sun's motion perpendicular to the galactic plane

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.316..706b&link_type=abstract

Nature (ISSN 0028-0836), vol. 316, Aug. 22, 1985, p. 706-708.

Mathematics

Logic

29

Biological Evolution, Milky Way Galaxy, Planetary Craters, Solar Oscillations, Solar Position, Solar Terrestrial Interactions, Astronomical Models, Extinction, Mass Distribution, Planetary Evolution, Reference Stars, Solar Velocity

Scientific paper

The range of periods and vertical excursions consistent with the distribution of tracer stars in the Galaxy is calculated, and the probable phase jitter in the solar period is evaluated. The time taken by the sun to reach a certain height above the Galactic plane is measured by a formula using the total energy and the potential energy derived from some Galaxy models such as the ISM, the all disk, and the proportional models. The present study finds acceptable half-periods for the vertical oscillation that range from 26 to 37 Myr (including the range of periods that have been inferred from terrestrial records on mass extinctions and on cratering), maximum heights above the plane from 49 to 93 pc, and an average phase jitter per half-period of the order of 6-9 percent. For all the models considered, the most recent passage of the sun through the Galactic plane occurred in the past 3 Myr provided only that the present position of the sun is between 0 and 20 pc above the plane. The study may help explain terrestrial mass extinctions and cratering records.

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