<p>There are such evidence in the case of Mars. Observations from <a href="http://en.wikipedia.org/wiki/Mars_Global_Surveyor">Mars Global Surveyor</a> show evidences of crustal magnetization. In particular, this magnetization has extensive, east-west trending linear features in Terra Cimmeria and Terra Sirenum. These are probably reminiscent of magnetic features associated with a reversing dipole.</p>

<p>There are no such evidence in the case of Venus: Venus has no intrinsic magnetic field today (contrary to the common belief, its inability to maintain a dynamo activity is either due to its chemical and physical conditions unable to form a solid core, either du to an early complete core solidification; it is not due to its slow rotation), and could not have maintained a remanent crustal magnetization, because its crust would have been to hot during its dynamo activity (above the Curie point).</p>

<p><strong>Sources</strong>:</p>

<ul>
<li><a href="http://www.sciencemag.org/content/284/5415/794.abstract">Acuna et al. (1999)</a></li>
<li><a href="http://www-ssc.igpp.ucla.edu/personnel/russel/papers/venus_mag/">Luhmann &amp; Russell (1997)</a></li>
</ul>

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2013-10-14T10:17:06.863Z
2013-10-14T10:17:06.863Z
MBR
<p>From geological records in rocks and minerals we know that the magnetic field of Earth changed its polarity multiple times in the history. See <a href="https://en.wikipedia.org/wiki/Geomagnetic_reversal">Geomagnetic reversal</a>.</p>

<p>Was a similar process of a planetary magnetic field reversal observed on other planets?</p>

<p>I suppose that the record could be in rocks directly found on the planet (i.e. Mars), on its moons or in asteroids.</p>

<earth><planet><core><magnetic-field>
Were effects of a planetary magnetic field reversal observed on other planets than Earth?
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# Were effects of a planetary magnetic field reversal observed on other planets than Earth?

(Asked by: username_0 on 2013-10-09)

From geological records in rocks and minerals we know that the magnetic field of Earth changed its polarity multiple times in the history. See [Geomagnetic reversal](https://en.wikipedia.org/wiki/Geomagnetic_reversal).

Was a similar process of a planetary magnetic field reversal observed on other planets?

I suppose that the record could be in rocks directly found on the planet (i.e. Mars), on its moons or in asteroids.

**Tags:** earth, planet, core, magnetic-field


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## 1 answers

### Answer by username_1 on 2013-10-14. Score: 5 | Accepted answer

There are such evidence in the case of Mars. Observations from [Mars Global Surveyor](http://en.wikipedia.org/wiki/Mars_Global_Surveyor) show evidences of crustal magnetization. In particular, this magnetization has extensive, east-west trending linear features in Terra Cimmeria and Terra Sirenum. These are probably reminiscent of magnetic features associated with a reversing dipole.

There are no such evidence in the case of Venus: Venus has no intrinsic magnetic field today (contrary to the common belief, its inability to maintain a dynamo activity is either due to its chemical and physical conditions unable to form a solid core, either du to an early complete core solidification; it is not due to its slow rotation), and could not have maintained a remanent crustal magnetization, because its crust would have been to hot during its dynamo activity (above the Curie point).

**Sources**:

* [Acuna et al. (1999)](http://www.sciencemag.org/content/284/5415/794.abstract)
* [Luhmann & Russell (1997)](http://www-ssc.igpp.ucla.edu/personnel/russel/papers/venus_mag/)


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