Questions tagged [magnetic-field]

Questions regarding magnetic fields.

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Is an alpha particle cosmic ray more easily deflected on its journey than a proton? Or vice versa?

Has everyone heard about the cosmic ray that hit Utah recently with an energy of about 240 EeV? Making it the third-highest-energy of all time? Scientists say it seems to have come from a void, and ...
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Question about the core mass fraction of planets and its relation to the magnetic field

I have a question about planetary cores and their relation to the magnetic field. Around how massive (using this in the sense of mass, not size, for clarity) does a core need to be in relation to the ...
DanceroftheStars's user avatar
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What would be the new Equation of motion if the magnetic field's origin is shifted from the origin of a co-rotating spherical polar coordinates?

The equation of motions due to the dipole magnetic force of a planet in a frame corotating with the planet and origin at the centre of planet assumed to be sphere components wise are given as below: \...
Lunthang Peter's user avatar
3 votes
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Clarifications on Planetary Magnetic Fields

I believe I understand this equation for the dynamo effect of planets as far as iron-nickel cores go, where ρ is density in kilograms per cubic meter, Ω is rotation speed in radians per second, σ is ...
Pyrania's user avatar
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Is the magnetic permeability (mu_0) necessary in the expression for planetary magnetic field?

To numerically analyse the Lorentz effect due to the magnetic field, say, radial component on a charge particles which of the expression would be correct, $\{ B_r = \frac{2R}{r^3} g_1^0 \cos(\theta) \}...
Lunthang Peter's user avatar
6 votes
1 answer
165 views

On the Radiation Field of large Gas Giants

I am woring on creating a fictional star system, and I need to find an answer to a question to find an accurate way to depict this. I am aware that Gas Giants create a dangerous field of radiation ...
DanceroftheStars's user avatar
3 votes
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Is Venus' magnetosphere actually more powerful than the solar wind's magnetic field that induced it or vice versa?

Is the Venusian magnetic field actually more powerful than the solar wind's magnetic field that induced it? I know that Venus' magnetic field is not due to Magnetohydrodynamic processes rather, it is ...
Arjun's user avatar
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Could two celestial bodies with extreme magnetic fields affect each other's motion via magnetism?

Assume we have two objects that exist on a planetary / stellar scale. It could be a pair of magnetars, black holes, or really really big neodymium magnets. All that matters is the scale, and the ...
A very curious idiot's user avatar
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Where do these materials on the Sun come from, if not nothingness?

In this video, I see that for hours, it seems that the flow keeps going from the 11h direction to the Sun's surface - while there looks like nothing is coming to the top of the loop to provide a ...
longtry's user avatar
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Are stars attracted to one another by their magnetic fields?

What effect do the magnetic fields of stars have on one another:do they tend to repel or attract one another?
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What is the force that drives electrons along the magnetic filaments of galaxies?

"Milky Way's mysterious filaments have 'older, distant cousins'" https://www.techexplorist.com/milky-ways-mysterious-filaments-older-distant-cousins/54966/?amp=1 Quote from article: "...
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Conversion of 1D plot in 3D plot gives different physics

I am to track the path of a particle due to Lorentz force of the planet magnetic field, assuming there is no gravitational force on it. The equation of motion due to Lorentz force in rotating ...
Lunthang Peter's user avatar
4 votes
2 answers
397 views

Can a tidally locked planet sustain a magnetic field

The vast majority of stars in the Galaxy, and probably the universe, are red dwarfs. The habitable zones of these stars are very close to the stars themselves, often within what would be Mercury’s ...
user98816's user avatar
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Convert from magnetic coordinates to true coordinates

I am working with the IGRF (International Geomagnetic Reference Field) model and from a journal article found here, I am able to compute the earth's magnetic field at any point in spherical ...
mwoods's user avatar
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How do remnants of supernova have a magnetic field which cause the insane speed of cosmic rays?

If a star undergoes a supernova explosion, how does it retain its magnetic field to excite the moving particles to near speed of light velocities as stated in observations of NASA?
Naveen V's user avatar
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Are there any experiments or observations indicating that the Hubble flow can influence AGNs, quasars and galactic winds (outflows)?

Galactic winds (or outflows) are produced by AGNs (Active Galactic Nuclei), quasars, supernovas...etc which basically eject matter usually in form of waves or spheres, sometimes even arriving to the ...
vengaq's user avatar
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How close does a double-planet have to be to provide magnetic protection to a smaller body?

A spinoff of my previous question, regarding the Orbital Stability of a Double Planet System. Imagine two closely-orbiting bodies with a semi-major axis of 79,250 km. One of which is 2M🜨, with a ...
Thoth's user avatar
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Can the Hubble expansion inject energy in AGN and quasar outflows?

I found this article about the behavior of quasar outflows in cosmology and how they can create a magnetic field. In section 2.1.4., the authors say that when a quasar produces a "wave" or ...
vengaq's user avatar
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Why are most cosmic rays positively charged? Has anyone figured this out yet?

It is by now very common knowledge that the vast majority of (known) cosmic rays are protons, alpha particles and such, yet I cannot find in my recent reading any discussion of why this might be, or ...
Kurt Hikes's user avatar
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What is the minimum strength of a magnetosphere needed to sustain life?

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. ...
ΓΙΑΝΝΗΣ ΜΙΧΑΗΛΙΔΗΣ's user avatar
15 votes
2 answers
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How could Mars' atmosphere be shed by solar winds, when Venus has a thick atmosphere despite no magnetic field?

Our current understanding of how Mars lost its atmosphere is because it lost it magnetic field, due to a barrage of reasons, such as core cooling due to low volume and cooling off quickly. This ...
Alastor's user avatar
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6 votes
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What happened to Titan's magnetic field?

From Wikipedia - Titan's atmosphere: Titan's internal magnetic field is negligible, and perhaps even nonexistent, although studies in 2008 showed that Titan retains remnants of Saturn's magnetic ...
DialFrost's user avatar
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Does magnetosphere have an influence on where meteorites would impact on Earth?

I have an interest in geology and I have taken an interest in learning about meteorites recently. This may be a redundant question but it seems as if there are meteorite rich areas where there seem to ...
Jay Kambestad's user avatar
2 votes
1 answer
170 views

Does interplanetary magnetic field interact with the planet's own magnetic field?

The Wikipedia states on the page about the Interplanetary magnetic field that The interplanetary magnetic field (IMF), now more commonly referred to as the heliospheric magnetic field, is the ...
apk's user avatar
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Are there areas within Jupiter's magnetosphere without powerful radiation?

I know Jupiter has powerful radiation belts, but I'm wondering if there are places within the magnetosphere that are relatively calm. I'm asking about Jupiter (a gas giant we know) because I'm curious ...
Elhammo's user avatar
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How do neutron stars maintain inhomogeneous surfaces and migrating "hot spots"? (e.g. SGR 1830-0645)

News item NASA's NICER Tracks a Magnetar's Hot Spots and Phys.org's Properties of magnetar SGR 1830−0645 inspected with NICER reference the January 14 2022 arXiv Pulse Peak Migration during the ...
uhoh's user avatar
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15 votes
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756 views

Has a magnetic field flip of a distant star ever been measured?

The magnetic field of the Sun flips during each solar cycle, with the flip occurring when sunspot cycle is near its maximum. Levels of solar radiation and ejection of solar material, the number and ...
2080's user avatar
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2 votes
2 answers
467 views

Could a magnetosphere be created for Venus by recreated by spinning-up the planet to a 24 hour day?

If Venus in it is current state, started rotating at the same rate as Earths 24hrs rotation, would it develop a magnetic field of roughly the same strength as Earth's? If so, would that help in any ...
eBookworm's user avatar
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Why would a black hole's magnetic hair being short-lived not violate the no-hair conjecture, but long-lived hair would? How long is "long-lived"?

Phys.org's Magnetic 'balding' of black holes saves general relativity prediction says: There is a potentially hairy threat to the conjecture, though. Black holes can be born with a strong magnetic ...
uhoh's user avatar
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5 votes
1 answer
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Strength of the relationship between very large solar flares, coronal mass ejections, and solar proton events?

In the years 774-775 and 993-994, there were large peaks in Earth's atmospheric radiocarbon (14C) concentration. While the cause was initially disputed, Mekhaldi et al.'s 2015 study of annually ...
Gabriel's user avatar
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2 votes
1 answer
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How big is the Lorentz force on the Sun?

The LOFAR observations have made an estimate of the magnetic field of the Milky Way. The value in our region is very small. About 1/1000 of the Earth magnetic field. The Earth and the Sun move at a ...
Deschele Schilder's user avatar
2 votes
1 answer
626 views

What are Ellerman bombs and how can we identify them?

Have you ever heard about Ellerman bombs? Spaceweather.com talks about them on their news page. You could see some of them around sunspot AR2835: Ellerman bombs are magnetic explosions about one-...
B--rian's user avatar
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How big is the energy content of the magnetic field of the Milky Way?

Galaxies have associated magnetic fields. So does the Sun and so does the Earth. In the case of the Earth and Sun it seems clear that the energy content of the magnetic fields is much less than their ...
Deschele Schilder's user avatar
5 votes
1 answer
444 views

How big is the galactic magnetic field in the solar system and how can we measure it?

The Milky Way has an associated magnetic field. But how big is it influence in the solar system and can we measure it? I mean, when measuring, how can we make the distinction between the field of the ...
Deschele Schilder's user avatar
2 votes
0 answers
51 views

What is the sun's maximum influence on a magnetic object?

How much magnetic repulsion could the sun's magnetic field produce on an magnetic object? Consider the object is ideal: It could be flat, to create more resistance, balanced, to stay on the opposing ...
Justintimeforfun's user avatar
12 votes
1 answer
4k views

Why do sunspot rise in number "precisely" every eleven years?

Every eleven years (more or less precisely) sunspots are seen to rise in numbers. The magnetic field of the sun changes polarity over eleven years and this is the reason the number of spots can vary. ...
Deschele Schilder's user avatar
0 votes
1 answer
140 views

Why is the 11 yr sunspot cycle less predictable recently?

I quoted from a similar question on solar minima and maxima. "...I guess the jury is still out, but this is quite "fringe" material. The solar cycle is certainly thought to be a product ...
Chris Phillips's user avatar
6 votes
1 answer
956 views

Why is the magnetic axis of Uranus and Neptune off center?

It(Uranus) rotates on its side, tilted almost 98 degrees from the plane of its orbit around the sun. The axis of its magnetic field is tilted too, at a 59-degree angle from the rotational axis. The ...
Nilay Ghosh's user avatar
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3 votes
2 answers
206 views

How massive does a moon have to be to have a stable magnetic field?

Is there a minimum mass or other minimum properties necessary for a body to have a strong, stable dynamo to create a magnetic field conducive for life? For example, would it be possible for Titan to ...
literaldehyde's user avatar
2 votes
2 answers
274 views

Would it be possible to detect a magnetic field around an exoplanet?

Of course, we can't fly a magnetometer next to an exoplanet to measure the magnetic field, but might it be possible to find indirect evidence (e.g. polar auroras) of a magnetic field generated by an ...
usernumber's user avatar
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4 votes
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Why is solar corona in visible light filamentary?

There is a video on YouTube (unfortunately in Czech) where Miloslav Druckmüller talks about structure of the solar corona in visible light. He explains that the filaments, clearly visible on his ...
Leos Ondra's user avatar
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1 vote
1 answer
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What about the magnetic field strength inside of an old accreting neutron star?

As the magnetic field strength outside an old accreting neutron star is thought to be small (about $10^8-10^{10}$ Gauss), what about it inside the star? Because of the superconductivity and ...
Chen's user avatar
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4 votes
1 answer
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How would Earth's magnetic field change if the outer core was solid?

A widely accepted theory for how the Earth's magnetic field is generated is the dynamo theory. Dynamo theory describes how molten magma convection currents containing metal are locally spun the same ...
Connor Garcia's user avatar
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4 votes
1 answer
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Why does a right-handed circular polarized wave get lagged when going through ionized plasma?

I have a question related to Faraday rotation. In Abigail Polin's Faraday rotation video I have seen that a linearly polarized wave can be decomposed in a left-handed circular wave and a right-handed ...
Miguel Cárcamo's user avatar
4 votes
2 answers
1k views

What would Aurora look like if no magnetic field was present around the Earth?

The greatest part of the Earth is protected from the Solar wind by its magnetic field. This field makes the wind particles (mainly protons and electrons) the beauty of Aurora appear. Suppose the ...
Deschele Schilder's user avatar
2 votes
0 answers
27 views

How would Aurora look like if no magnetic field was there to protect the Earth? [duplicate]

The greatest part of the Earth is protected from the Solar wind by its magnetic field. This field makes the wind particles (mainly protons and electrons) the beauty of Aurora appear. Suppose the ...
Deschele Schilder's user avatar
5 votes
0 answers
76 views

How is angular momentum transferred between a neutron star and its accretion disk?

Accreting neutron stars can either gain or loose angular momentum via interaction with their accretion disks. This leads to either spin-up or spin-down. Which of the two is the case, depends on the ...
SpaceCore's user avatar
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6 votes
3 answers
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How do magnetic fields mess with astronomers' observations?

Does anyone else watch 'Dr. Becky' on YouTube? Her March 'Night Sky News' video, subtitled 'The biggest black hole burp, a wobbly Milky Way & Betelgeuse is brighter' says that... Obviously lots ...
Kurt Hikes's user avatar
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4 votes
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Why is our heliosphere an asymmetric croissant shape?

The big, recent astronomy news about our heliosphere's asymmetric croissant shape has me confused.... Some articles mention the influence on our solar system's outermost boundary of very hot cations, ...
Kurt Hikes's user avatar
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2 votes
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Is the magnetic field strength of a star predictable from mass, composition, age and angular momentum alone?

This answer to Which stellar properties can we describe as “first principles” in which we can derive the rest? contains an intriguing bit: That states that composition and mass are the two key ...
uhoh's user avatar
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