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A new analysis reveals that the gigantic impact that led to the Moon's formation might have also switched on Earth's magnetic field. Based on their bulk density, Venus and Earth have cores that take up about half of their radius and roughly 15% of their volumes.
In 1967, Venera 4 found Venus's magnetic field to be much weaker than that of Earth. 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.
The solar wind – a million-mile-per-hour gale of electrically charged particles streaming continuously from the Sun – carries with it the Sun's magnetic field. When the Sun's magnetic field interacts with the electrically excited ionosphere of Venus, it creates or induces, a magnetic field there.
The article explains therefore that although Venus does not have an intrinsic magnetic field, the interaction of the thick atmosphere with the solar winds causes an externally induced magnetic field, that deflects the particles of the solar winds.
A new study, led by Johns Hopkins APL researchers using data from Solar Orbiter’s first flyby of Venus, found the planet’s unusual magnetic field can still accelerate particles to millions of miles per hour — a finding valuable to understanding magnetospheres around planets outside our solar system.
Even though Venus is similar in size to Earth and has a similar-sized iron core, the planet does not have its own internally generated magnetic field. Instead, Venus has what is known as an induced magnetic field.
For some time, astronomers have struggled to answer why Earth has a magnetic field (which allows it to retain a thick atmosphere) and Venus do not. According to a new study conducted by an...
Janet Luhman clarifies why Venus' missing magnetic field hasn't lost the planet its atmosphere.
Unlike most planets, including Earth, Venus does not exhibit an intrinsic magnetic field (see geomagnetic field). Sensitive measurements by orbiting spacecraft have shown that any dipole field originating from within Venus must be no more than 1/8,000 that of Earth’s.
Unlike Earth, Venus has no inherent magnetic field generated by the motion of molten metal in its core. The planet, however, has what scientists call an induced magnetic field, a weak magnetic...