9 hours ago, AlanGomez said:

There is a well know mechanism here:  Chemical changes inside Mars's core caused it to lose its magnetic field. This, in turn, caused it to lose its oceans. https://daily.jstor.org/how-mars-lost-its-magnetic-field-and-then-its-oceans/

Pure speculation.

Quote

From your reference.

Billions of years ago, the atmosphere of Mars may have been denser and the air slightly warmer.

And then again it may not.

We don't really understand the mechanism of Earth's magnetic field, let alone that of any other world.

 

I don't care what other people off site may think, I am supposed to be able to read what the poster and promoter thinks without leaving this site and you are not telling me.

 

Quote

Chemical changes

A powerful magnetic field from chemical effects ?

9 hours ago, AlanGomez said:

There is a well know mechanism here:  Chemical changes inside Mars's core caused it to lose its magnetic field. This, in turn, caused it to lose its oceans. https://daily.jstor.org/how-mars-lost-its-magnetic-field-and-then-its-oceans/

Pure speculation.

Quote

From your reference.

Billions of years ago, the atmosphere of Mars may have been denser and the air slightly warmer.

And then again it may not.

We don't really understand the mechanism of Earth's magnetic field, let alone that of any other world.

 

I don't care what other people off site may think, I am supposed to be able to read what the poster and promoter thinks without leaving this site and you are not telling me.

 

Quote

Chemical changes

A powerful magnetic field from chemical effects ?

7 hours ago, studiot said:

Pure speculation.

And then again it may not.

We don't really understand the mechanism of Earth's magnetic field, let alone that of any other world.

 

I don't care what other people off site may think, I am supposed to be able to read what the poster and promoter thinks without leaving this site and you are not telling me.

 

A powerful magnetic field from chemical effects ?

Pure speculation.

And then again it may not.

We don't really understand the mechanism of Earth's magnetic field, let alone that of any other world.

 

I don't care what other people off site may think, I am supposed to be able to read what the poster and promoter thinks without leaving this site and you are not telling me.

 

A powerful magnetic field from chemical effects ?

It is apparently hypothesised that the core of Mars may have ceased to develop a magnetic field due to phase changes or fractionation of the mixture. 

22 minutes ago, exchemist said:

It is apparently hypothesised that the core of Mars may have ceased to develop a magnetic field due to phase changes or fractionation of the mixture. 

Yes thanks.

Hypothesised with no support other than a dodgy web report. Conditions in a diamond anvil are microscopic, although experimentsw with it have resulted in the discovery of new rock materials here on Earth. It is a good tool.

So pure speculation.

So what does the history of Mars have to do with desert conditions on Earth ?

And in particular how did the reduction in magnetic field lead to a change in the martian atmousphere ?
The atmousphere is held by gravity not magnetism.
And currently at least, the martian atmousphere is greater than 95% carbon dioxide.

 

For core comparison we have little data for mars, for Earth we have

Iron 86%
Hydrogen 0.06%
Sulphur  less than 2%

 

How do these figures compare with the proposed iron - sulphur - hydrogen core for Mars?
And what chemical reactions and composition percentages could lead to any magnetism or cessation of it ?

 

My sources of Data are the Cambridge handbook of the Solar System, which has useful discussions of the composition of Earth's surface v Mars and the history of the martian magnetic field, which apparantly was once reversing like Earth's.

and the The Cambridge Handbook of Earth Science Data.

1 minute ago, studiot said:

Yes thanks.

Hypothesised with no support other than a dodgy web report. Conditions in a diamond anvil are microscopic, although experimentsw with it have resulted in the discovery of new rock materials here on Earth. It is a good tool.

So pure speculation.

So what does the history of Mars have to do with desert conditions on Earth ?

And in particular how did the reduction in magnetic field lead to a change in the martian atmousphere ?
The atmousphere is held by gravity not magnetism.
And currently at least, the martian atmousphere is greater than 95% carbon dioxide.

 

For core comparison we have little data for mars, for Earth we have

Iron 86%
Hydrogen 0.06%
Sulphur  less than 2%

 

How do these figures compare with the proposed iron - sulphur - hydrogen core for Mars?
And what chemical reactions and composition percentages could lead to any magnetism or cessation of it ?

 

My sources of Data are the Cambridge handbook of the Solar System, which has useful discussions of the composition of Earth's surface v Mars and the history of the martian magnetic field, which apparantly was once reversing like Earth's.

and the The Cambridge Handbook of Earth Science Data.

I don't disagree at all. Trying to read across that hypothesis to the Earth, even if it makes sense on Mars, about which I am agnostic at this point, is pretty ridiculous.  

On 10/17/2024 at 3:20 AM, studiot said:

And in particular how did the reduction in magnetic field lead to a change in the martian atmousphere ?

I'm currently watching a documentary series about how the universe works, and it indicates that it is crucially important to life for its planet to have a magnetic field. Without a magnetic field, the solar wind will strip away any atmosphere and volatile materials the planet may have. In the past, Mars was much more Earth-like, but when it lost its magnetic field, it became the desolate planet we see today.

Edited September 21Sep 21 by KJW