Questions tagged [magnetic-field]

Questions regarding fields of magnetisms and their effects on Space Exploration, such as the Earth's magnetic field.

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32
votes
3answers
33k views

How much power would a spacecraft's magnetic shield require?

I've read over the decades that a magnetic shield might protect a spacecraft from cosmic radiation. Its a fascinating idea that might only be theory or science fiction at the moment. In regards to ...
16
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5answers
20k views

Can magnets be used to launch spacecraft?

I assume there is some reason we don't use magnets to launch off Earth. Are they not strong enough? Isn't magnetic force technically stronger than gravity?? Would either of these work: A tube tunnel ...
6
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2answers
741 views

The Orbital Mass Accelerator Engine Theory

Can 2 satellites equal in weight traveling on the same orbital path in the opposite directions intersect and propel each other to gain altitude in orbit? Can orbital perturbation be negated during ...
15
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2answers
8k views

What is the math behind Magnetorquers?

I'm trying to better understand the mathematics behind how torque rods work. I know that even if you have 3 axis of magnetic torquers, in effect there is only 2 axis of control, and I'm trying to ...
54
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4answers
16k views

Would terraforming Mars be possible?

Mars is a planet commonly brought up when talking about terraforming. Even if we were to manage to get past all economic barriers, and somehow form a thick atmosphere, would the lack of a magnetic ...
47
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7answers
71k views

How would it be possible to kick start Mars's magnetic field?

Jumping from this question about terraforming Mars, how would one mitigate the main obstacle, namely Mars's lack of a magnetic field? Are there any hypothetical processes that might restart Mars's ...
10
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2answers
1k views

How could an induced magnetosphere be created at Mars for terraforming?

In the long run Mars needs a magnetic field to keep a thick atmosphere and for radiation shielding, if humanity were to terraform it. Starting a dynamo in Mars' core seems forever impossible, but a ...
14
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2answers
6k views

Place a satellite at Sun-Mars L1 to shield Mars from Sun radiation

Instead of placing many magnetic satellites close to Mars to artificially generate a magnetic field to protect Martian colonists from harming radiation, we could place a magnetic satellite at ...
19
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5answers
3k views

Passive attitude stabilization with magnets - are there studies based on actual flight data?

Specifically with the small satellite and cubesat people, there is an rather 'old' idea around: Passive attitude stabilization based on permanent magnets. Schematic of the Earth magnetic field lines ...
4
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1answer
151 views

Where do ion propulsion's ions go? Do they remain in the solar system or shoot out into interstellar space?

Writing this answer has got me thinking. You can estimate the exhaust velocity of an ion engine using $$\frac{v}{c} = \sqrt{\frac{2E}{m_0 c^2}}. $$ Choose $E=$ 100 keV and $m_0 c^2=$ 931 MeV times ...
9
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3answers
6k views

Are magnetic boots in space practical?

I can't count how many science fictions stories I have read where someone is strapping on magnetic boots to walk in or on a space ship without gravity. How realistic of a solution is this? Just for ...
6
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1answer
471 views

Could an articulated permanent magnet work as a low-power cubesat magnetotorquer? Problems?

Conventional magnetotorquers for cubesats are electromagnets that produce torque in the Earth's magnetic field, and nearly all of the power they use just heats the copper through $\text{I}^2 \text{R}$ ...
3
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2answers
3k views

Could magnetic “boots” be used to simulate the effects of gravity for asteroid ships?

I have been to the Wikipedia pages on alternatives to gravity, and found the usual alternative forces, with the potential for magnets and the specious Russian claims, but I'm wondering why not just ...
1
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3answers
643 views

Could a powerful enough laser or maser heat the core of Mars?

I think that if we could build a powerful enough laser/maser to heat the core of Mars up and melt it, it could generate a magnetic field, which would allow for easier living on Mars. Could this be ...
5
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5answers
2k views

Would it be possible to deploy a man-made magnetic field in Mars orbit for terraforming? [closed]

I know terraforming Mars has been a topic of discussion for a long time. One of the larger obstacles is the planet's weak magnetic field, which if I understand correctly is integral to containing an ...
11
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2answers
2k views

Re-entry Heat Shield Alternative

Why is it that Controlled Re-entry Vehicles (like the most recent Orion & Dragon) do not use a strong magnetic field during re-entry to "shield" the blunt shaped end from plasma ? Reasoning: ...
10
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1answer
2k views

Would magnetic torquers placed in a polar satellite work?

Would magnetic torquers placed in a polar satellite keep the satellite stable? If it would work, would it be very efficient?
6
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1answer
323 views

What is the nature of a “flux tube” between Saturn and Enceladus, and what does “L‐shell=4” mean?

The NASA JPL YouTube video Sounds of Saturn: Hear Radio Emissions of the Planet and Its Moon Enceladus (below, also here) provides and audio and spectral representation of plasma waves recored by ...
3
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1answer
109 views

How could Earth's magnetic field be used to determine a cubesat's attitude in LEO?

After reading this answer I thought that I'd read about a smallsat that used magnetometers to measure the Earth's magnetic field direction and magnitude along with a model for Earth's field and some ...
2
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2answers
381 views

Can objects be deorbited by a satellite using a magnetic field?

Can a magnetic field be made around a satellite for a split second to gain or loose momentum from another satellite or debris with a few passes with a near-miss trajectories on larger debris? Could a ...
2
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2answers
417 views

Artificial Magnetosphere to Terra-form Mars?

I was reading a 2017 article on a potential that Mars could be terraformed using a magneto-tail; A Future Mars Environment for Science and Exploration. This would basically entail sticking a giant ...
16
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1answer
960 views

Preventing orbital decay and micro adjustments to orbits by “leaning” on Earth's magnetic field

Would it be possible, using current technology and renewable energy sources only (e.g. photovoltaics), to magnetically polarize external shields of orbiting satellites in such a way, to effectively ...
14
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2answers
3k views

How will Juno establish existence of solid core within Jupiter and determine its size?

One of the set goals for NASA's New Frontiers Juno mission is studying Jupiter's interior and determining if this gas giant has a solid core and if, how large it is. This is mentioned several times on ...
5
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2answers
1k views

Using Earth's magnetic field for an electric propulsion system

If you were to use a spacecraft built of copper in Earth's magnetic field, could you produce enough energy to propel yourself?
15
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3answers
2k views

Is a magnetic field really needed to terraform Mars?

I see so many discussions about how the main roadblock to terraforming Mars is its lack of a magnetic field. If Mars had an atmosphere as thick as Earth's but no magnetic field, wouldn't it still take ...
8
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1answer
210 views

Have Magnetorquers been used anywhere outside of the Earth?

On Earth, small satellites often include Magnetorquers. A magnetorquer allows the satellite to re-orient itself without using fuel in a way more permanent than magnets. While not every planet has a ...
8
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2answers
699 views

Could Magnetorquers be used on the ISS?

The way that the ISS manages it's attitude now is to use a set of reaction wheels for primary control, and occasionally firing small thrusters to allow the wheels to despin themselves. This isn't ...
2
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1answer
610 views

Do GPS satellites use the earth's magnetic field in any way?

There's a lot of speculation about how changes or flips in the Earth's magnetic field would affect us, our machines, and sea turtles. I'm curious about the GPS satellites themselves. In one way they ...
9
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4answers
965 views

Is the Paramagnetism of Liquid Oxygen Ever Considered in Engine or Tank Design?

NOTE: I'm asking if this material property is ever considered. I'm not asking "do you think it should be considered". I'm pretty sure someone has considered it, and I am hoping to track down some ...
8
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1answer
984 views

How strong a magnetic field does Mars need to contain Earth-like atmosphere?

A quick follow-up to How would it be possible to kick start Mars's magnetic field? For example, the Venerean atmosphere is contained by merely an induced magnetic field. How powerful would ...
7
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1answer
260 views

Could a magnetorquer be used in orbit around Mars?

One way to align a spacecraft into a certain manner while in orbit around a body is the use a Magnetorquer. Does Mars have enough of a magnetic field to allow such a device to operate?
6
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1answer
557 views

Can Earth magnetic field be used for attitude determination in LEO?

…or, how well is the Earth magnetic field mapped? Three hallotrons (simple, cheap, robust, tiny, low-power devices) aligned in three axis can be used to determine the direction of local vector ...
1
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1answer
107 views

How were Venera's variometers able to measure extremely weak, nano-Tesla magnetic fields?

The image below is from the really interesting page Inventing The Interplanetary Probe (linked by @A.Rumlin here). Above the fluxgate magnetometer there is a pair of short tubes labeled "Variometers"....
1
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1answer
224 views

Can it be realistic to build a artificial magnetic field around Mars? [duplicate]

I was wondering how realistic it is to build an artificial magnetic field around Mars using electromagnetism. So my question is; what kind of current would be needed in a loop around Mars' equator to ...
1
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0answers
120 views

If the ISS hull were ferromagnetic what kinds of problems would that cause?

The question ISS Electromagnetic anchoring asks if the hull of the ISS were ferromagnetic, which would allow astronauts on EVAs to use magnetic grapples to assist in moving around. The answer sadly, ...