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This magnetic field is induced by an interaction between the ionosphere and the solar wind, [78] [79] [page needed] rather than by an internal dynamo as in the Earth's core. Venus's small induced magnetosphere provides negligible protection to the atmosphere against solar and cosmic radiation.
Components of the induced magnetosphere are shown. Venus is known not to have a magnetic field. [46] [47] The reason for its absence is not at all clear, but it may be related to a reduced intensity of convection in the Venusian mantle. Venus only has an induced magnetosphere formed by the Sun's magnetic field carried by the solar wind. [46]
A rendering of the magnetic field lines of the magnetosphere of the Earth. In astronomy and planetary science, a magnetosphere is a region of space surrounding an astronomical object in which charged particles are affected by that object's magnetic field. [1] [2] It is created by a celestial body with an active interior dynamo.
We now know that every day, magnetic north traces an elliptical path of about 75 miles (120 kilometers). Since its discovery, magnetic north has drifted away from Canada and toward Russia.
Schematic of Earth's magnetosphere, showing the relative position of the magnetosheath. Scientific research into the exact nature of the magnetosheath has been limited due to a longstanding misconception that it was a byproduct of the bow shock/magnetopause interaction and had no inherently important properties of its own.
At the same time, the gravity at the proposed altitude is 8.73 m/s 2 versus 9.81 m/s 2 on Earth's surface. [citation needed] Venus has an induced magnetosphere from the interaction of its thick atmosphere with the solar wind, and its nearer proximity to the Sun brings it further within the Sun's magnetic field, which decreases the interstellar ...
G. David Nordley has suggested, in fiction, [45] that Venus might be spun up to a day length of 30 Earth days by exporting the atmosphere of Venus into space via mass drivers. A proposal by Birch involves the use of dynamic compression members to transfer energy and momentum via high-velocity mass streams to a band around the equator of Venus.
The surface of Venus is comparatively flat. When 93% of the topography was mapped by Pioneer Venus Orbiter, scientists found that the total distance from the lowest point to the highest point on the entire surface was about 13 kilometres (8.1 mi), about the same as the vertical distance between the Earth's ocean floor and the higher summits of the Himalayas.