<p>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?</p>

CC BY-SA 4.0
2022-10-21T08:30:58.870Z
Venus has virtually no magnetic field and yet 100x the atmospheric surface pressure than Earth... so works without?
planetmaker
CC BY-SA 4.0
2022-10-22T16:56:55.233Z
@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.
Fred
CC BY-SA 4.0
2022-10-23T02:49:57.720Z
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.
uhoh
<planet><magnetic-field>
What is the minimum strength of a magnetosphere needed to sustain life?
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# What is the minimum strength of a magnetosphere needed to sustain life?

(Asked by: username_0 on 2022-10-21)

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?

**Tags:** planet, magnetic-field
> **Comments:**
> **username_1**: Venus has virtually no magnetic field and yet 100x the atmospheric surface pressure than Earth... so works without?  
> **username_2**: @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.  
> **username_3**: 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.  

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