On Earth, the magnetic field intensity is roughly between 25,000 - 65,000 nT. Assume for a second that we have a planet with double the atmospheric thickness of Earth but with a similar composition. How weak can such a planet's magnetic field be, yet still be capable of protecting the planet's atmosphere and the life that lives on it?

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    $\begingroup$ Venus has virtually no magnetic field and yet 100x the atmospheric surface pressure than Earth... so works without? $\endgroup$ Oct 21, 2022 at 8:30
  • $\begingroup$ @planetmaker: Not only that, but Venus is nearer to the Sun than Earth & experiences are higher "erosive" flux of solar particles. Additionally, being closer to the Sun, solar induced temperatures of the atmosphere would be higher than for planets beyond Venus. $\endgroup$
    – Fred
    Oct 22, 2022 at 16:56
  • $\begingroup$ Basically your question is based on a false premise, or at a minimum incomplete reasoning. I don't think it's a good fit for Astronomy SE in its current form. $\endgroup$
    – uhoh
    Oct 23, 2022 at 2:49


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