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Print/export Download as PDF ... Orbital characteristics; Epoch J2000 [n 1] Aphelion: 152 097 ... Earth is the third planet from the Sun and the only astronomical ...
If the form of the field were a magnetic dipole, the strength would decrease with the cube of the distance, resulting in about 10 −11 T at the Earth's orbit. The heliospheric current sheet results in higher order multipole components so that the actual magnetic field at the Earth due to the Sun is 100 times greater.
Earth's magnetic field deflects most of the solar wind, whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation. [4] One stripping mechanism is for gas to be caught in bubbles of the magnetic field, which are ripped off by solar winds. [ 5 ]
the Earth's mass, its gravitational field, and its angular inertia. These are all affected by the density and dimensions of the inner layers. [20] the natural oscillation frequencies and modes of the whole Earth oscillations, when large earthquakes make the planet "ring" like a bell. These oscillations also depend strongly on the inner layers ...
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Geosynchronous orbit (GSO): An orbit around the Earth with a period equal to one sidereal day, which is Earth's average rotational period of 23 hours, 56 minutes, 4.091 seconds. For a nearly circular orbit, this implies an altitude of approximately 35,786 kilometers (22,236 mi). The orbit's inclination and eccentricity may not necessarily be zero.
A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth. While this is true of any map, these distortions reach extremes in a world map.
Mineral physics – science of materials that compose the interior of planets, particularly the Earth. Near-surface geophysics – the use of geophysical methods to investigate small-scale features in the shallow (tens of meters) subsurface. Paleomagnetism – measurement of the orientation of the Earth's magnetic field over the geologic past.
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