50

Spacecraft and space suits do NOT generate a magnetic field for medical reasons. Any magnetic fields generated are side effects of using electric motors etc. The linked question on Skeptics thoroughly debunks the idea, noting that: Gagarin was not in "critical condition" after his flight; and, Any flights in LEO are well within Earth's magnetic field. ...


27

Yes, the research on shielding from energetic particles of solar wind plasma using dipole magnetic field continues, and perhaps the best indication of that is the filing of the Spacecraft shield patent (1) in 2010, roughly 2 years after the publication of the Plasma Physics and Controlled Fusion journal (2) that was noticed by the author of that Physics ...


26

Sources: bar magnet (annotated with a red "X"), aluminum can (annotated with a green "OK" check mark) Beautiful video and demonstration, thank you! However... That magnet in microgravity doesn't actually orient itself at all I watched the video carefully and at 00:44 the first time the magnet is released it is pretty far away from the ...


24

There are some very good ideas. This requires a multiple answer approach. This can not be resolved by one method only. I don't believe mass is the issue (if) the iron core is large enough in comparison to the over all mass of the planet. If that is the case then re-starting the mantel is within our current technology to do. We may be able to reach and ...


22

Earth's magnetic field is way too weak to repel against with the force required to launch anything into orbit. Actually, it's really easy to demonstrate that. Take one fridge magnet, place it on the kitchen scale, and write down its weight. Then turn the magnet around and weigh it also with its polarity reversed. You shouldn't see any difference and the ...


22

This answers the question on how to block ions coming directly from the Sun from hitting Mars by a satellite stationed at L1. It does not cover the fact whether such a shield is effective in reducing the radiation level on Mars surface. See e.g. here for more details on radiation. First, let's have a look at the magnetic field needed. Inside a magnetic ...


22

Well, an electric motor is arguably a 'pulsed magnetic device', as is a solenoid valve, but good ones try very hard to contain the fields to where they will do useful work. I suppose one could design a suit without any motors, and it may even have been done, but pumps, blowers and valves and such seem a sort of natural feature of a space craft life support ...


21

It's Monday, so let me rain on this parade a little. Current magnetic shield designs are adequate to protect against ionizing radiation from the sun. They aren't sufficient to protect against galactic cosmic radiation, which has a lot more energy in each particle. To effectively block that would take a shield with energy 100x greater. If Bamford's shield ...


19

The NASA public affairs department may have exaggerated a bit with the "went wild" quote. The encounter was not even noticed until two years after it happened! Evidence of the encounter was not noticed until 1998. Astronomers analysing old data found that Ulysses' instruments had detected a large drop in the number of protons passing, as well as a ...


16

It is not coincidence and it does not apply to just the Earth. The Sun, Earth, Jupiter, Saturn, Uranus, and Neptune all have sizable magnetic fields. Mercury and Ganymede have smaller but still noticeable magnetic fields. All of these bodies have one thing in common: They have a sizable amount of rotating, electrically conductive fluid somewhere beneath the ...


13

Given the question, as written (rather than the misleading title) - yes, a magnetic accelerator could be used to launch a spacecraft. The issues with so doing are several. the contents of the craft need to survive the magnetic fields needed for reasonable length accelerators the track the linear track is extremely long the circular track causes fairly ...


13

Check with Kentucky Space. They have KySat-2 on orbit using passive magnetic control. Here is a description of the control system from their website: Passive Magnetic Stabilization: KySat-2 is equipped with a passive attitude control scheme known as Passive Magnetic Stabilization. This passive control technique uses permanent magnets and magnetic ...


11

In theory, yes, if the accelerator and the spacecraft are of the same mass, they'll gain the same amount of velocity when they pass, and so they'll meet at a higher altitude on the opposite side. If they aren't the same mass, then the lighter one gains more speed than the heavier, and they won't meet up again. In practice, I don't think it's workable. The ...


11

This isn't an answer, just a minor addition to the previous answers. There have actually been cases where satellites have accidentally become magnetized and caused an undesirable magnetotorque; it is a legitimate consideration! From https://llis.nasa.gov/lesson/642 : An unanticipated roll torque was imparted to a commercial communications satellite launched ...


10

According to Wikipedia on formal definition of the dynamo theory, which itself paraphrases The Earth as a Distant Planet, Vázquez et al.: There are three requisites for a dynamo to operate: An electrically conductive fluid medium Kinetic energy provided by planetary rotation An internal energy source to drive convective motions within the ...


10

There are several misconceptions in your question/proposal: The Orion and the Dragon as well as other reentry capsules do not fly with the cone tip forward. They fly with the blunt "bottom" side forward. (fixed in the revised question) Plasma is created by the very passage of the vehicle through the air at high hypersonic velocities. At lower velocities, ...


10

RAX and RAX-2 and possibly other cubesats launched by the University of Michigan (I can't remember at the moment) used fixed neodymium based magnets on their Z+ axis. Hysteresis was added to dump any residual momentum after P-Pod ejection. On the RAX missions, the magnets then were used to orient the satellite vertically over the poles where the science ...


9

No, accelerometers do not rely on the magnetic field of the Earth. Diagrammatic explanation of how inertia is used to measure acceleration. (Source) As detailed here (own highlighting): Conceptually, an accelerometer behaves as a damped mass on a spring. When the accelerometer experiences an acceleration, the mass is displaced to the point that the ...


9

This question assumes Mars doesn't have a magnetic field because Mars' core is frozen solid. It's not. Mars has a partially liquid core, just as does the Earth. (The Earth has a liquid outer core and a solid inner core.) Whether Mars has a solid inner core is unknown, but it certainly does have a liquid outer core (and possibly a fully liquid core). (See C.F....


9

If you are able to terraform Mars in some reasonable amount of time, let's say in 100 years, then you don't need a magnetic field. Just do whatever you did to terraform the planet, but at one billionth of that rate, in order to counter the loss of atmosphere to the solar wind. Or don't even bother at all, leaving the problem to your great1000000-...


9

Mars has no magnetic field to protect any atmosphere we might add to the planet, but fortunately it would be lost very slowly, over geological time. Fortunately, both protecting and creating a Martian atmosphere can be achieved by parking one giant powerful space station at the Lagrange 1 point which would broadcast a magnetic field which would protect the ...


9

It's a "beam core" engine, described in some further detail on Project Rho's Big List O' Engines: Microscopic amounts of antimatter are reacted with equal amounts of matter. Remember: unless you are using only electron-positron antimatter annihilation, mixing matter and antimatter does NOT turn them into pure energy. Instead you get some energy, ...


8

Earth's atmosphere is also slowly "leaking" into space, but very slowly. This is because there are multiple processes involved in escaping atmospheres. One of those processes is Jeans escape, where due to Maxwell speed distribution and long enough mean free path molecules are able reach escape velocity and escape the atmosphere before "bumping" into another ...


8

Using gravity to remotely look at the hidden interior of a planet or moon has a remarkably long history. The idea goes back to Newton. He suggested measuring the divergence of a plumb bob near a mountain from the surveyed normal as a means of assessing the mass of the Earth. He dismissed this idea as impractical given the low quality of surveying ...


8

This turns out to be a pre-space-age thing. It's not really needed, most of the time it's perfectly fine to float around. On Skylab they provided an elaborate system of triangular grid floors and special shoes with triangular cleats to lock into them. The crew hated them and hardly ever used them. When body positioning is important (like for flying the ...


8

The way to solve this problem has recently been proposed by NASA. Put a magnet on the L1 Legrange point (between Mars and the Sun) of about 2 Tesla. This is what it looks like: At present, atmospheric loss on Mars is balanced to some degree by volcanic outgassing from Mars interior and crust. This contributes to a surface atmosphere that is about 6 mbar in ...


8

Yes, actually, and it is commonly used for LEO satellites. I know of a number of satellites that use magnetic field information to determine their location. It won't provide absolute attitude, but it is sufficient that another point of reference, such as the Earth's curvature or sun's position, is sufficient to determine where the spacecraft is pointed. It ...


8

It turns out the magnetic equator is quite important to for research on geophysics and the interaction of the Earth's field with the atmosphere and solar wind. This location seems ideal both for access to the geomagnetic equator, and for being able to launch sounding rockets without scaring the neighbors (nearby nations). From the maps below you can see ...


7

Turns out the way they're going to do that is quite a bit different than my initial thoughts, all neatly explained by Bill Nye in one of his Why With Nye videos he did for NASA's Juno mission:        Gravity perturbed orbit of the Juno spacecraft as it orbits planet Jupiter (video: Bill Nye Asks Does Jupiter Have A Core?) The ...


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