For those of you highly intrigued by our own Solar System, the comparison between Titan and Moon is fascinating at worst. How romantic! Titan has about the same equatorial gravity and a much higher equatorial rotational speed, tangentially, due to its larger size, 50% higher in radius, and its shorter rotational period, 50% in duration. Yet, it’s able to keep a magnificent nitrogen atmosphere, an astronomical challenge for a dwarf like Titan! Well, Moon is petite enough, so that’s not a problem. What’s happening, seriously? NASA is right about Mars, n’est-ce pas (https://simplyjet.wordpress.com/2015/11/08/nasa-is-boring-today/)? Well, I am not saying that the protection of a magnetic field is not important. It’s just that compared to tangential equatorial rotational speed and equatorial gravity, the magnetic field plays a much less significant role in the air density of an atmosphere, if you are comparing Mars and Earth. The reason why NASA is boring is not that it’s right or wrong, but that the supposedly most brilliant American organization, the leader of its national industry, is unable to do simple calculus to derive an analytical model for the atmosphere of a gravitationally rounded object. They actually resort to qualitative analysis for something this simple.
Well, if you are going for magnetic field, think Venus without a significant magnetic field. If you are going for surface gravity and tangential velocity, think Titan. I say, stay with simpler math and Newtonian mechanics. If you can’t even do the math, shame on you! Please note that Saturn has a super powerful magnetic field to protect Titan, so a strong magnetic field does make a difference. However, I say Earth’s magnetic field is still too weak for the lack of one with Mars to be a dominant factor. Again, do the math.