The field may be weak, but it extends over huge distances, and can have important effects. From the observed direction of interplanetary magnetic field lines, we believe this field comes from the Sun, ...
Magnetic field lines
The direction of the magnetic field vector follows from the definition above. It coincides with the direction of orientation of a magnetic dipole, such as a small magnet, or a small loop of current in the magnetic field.
Magnetic Field Lines
imaginary lines that indicate the strength and direction of a magnetic field. The orientation of the line and an arrow show the direction of the field. The lines are drawn closer together where the field is stronger.
Magnetic field lines loop through the solar atmosphere and interior to form a complicated web of magnetic structures. Many of these structures are visible in the chromosphere and corona, the outermost layers of the Sun's atmosphere.
Magnetic field lines
These lines are a way to show the structure of a magnetic field. A compass needle will always point along a field line. The lines are close together where the magnetic force is strong, and spread out where it is weak.
Magnetic field lines would ordinarily repel each other, causing sunspots to disperse rapidly, but sunspot lifetime is about two weeks.
A tube of magnetic field lines.
Flux Unit
(a) Unit of flux density. 1 f.u. = 10-26 watts per square meter per hertz (see Jansky).
(b) In radio astronomy energy is usually measured in units of 10-26 W m-2 Hz-1.
Converging magnetic field lines fairly close to the Earth can trap highly energetic particles so that they gyrate between hemispheres and slowly drift around the planet in two doughnut-shaped zones known as the Van Allen radiation belts.
Onset--The Sun's magnetic field lines start to break and reconnect, releasing energy and causing the prominence to erupt more rapidly
Main--The field lines continue to reconnect and the field closes down ...
The neutron star's magnetic field lines converge at the magnetic poles, so the charges get focussed and a narrow cone of non-thermal radiation is beamed outward. If the beam sweeps past Earth, you see a flash of light.
In the neighborhood around pulsars there are charged particles (mainly electrons) that tend to travel along the magnetic field lines. This has to do with the way magnetic fields and electrically charged things interact.
Their helical motion around the magnetic field lines of the Galaxy causes their distribution to appear isotropic (they are detected equally in all directions), even though astronomers believe that they originate in the shocks of supernova remnants.
The most common type of magnetic reconnection is separator reconnection, in which four separate magnetic domains exchange magnetic field lines.
This is much higher than the visible light displays, but emissions occur here at radio wavelengths, generated by fast moving electrons spiralling along Saturn's magnetic field lines.
18, magnetic field lines emerge from the interior through one member of a sunspot pair, loop through the solar atmosphere, then reenter the solar surface through the other spot.
Now most scientists believe that the heating of the corona is linked to the interaction of the magnetic field lines radiating out of the small patches mentioned above.
These stars also funnel matter down onto the white dwarf via the magnetic field lines, but the infalling matter has enough angular momentum to form a proper accretion disk within the system.
Much like a rubber band snaps suddenly if twisted too much, the distorted magnetic field lines break and reconnect to oppositely directed lines, releasing tremendous energy.
Imagine the Sun's magnetic field lines as ropes that get stretched and kinked and tangled as different latitudes of the Sun move around at different rates.
After a rotation of about 270 the magnetic field lines begin to twist about themselves and can diffuse through the conductor, disconnecting from the toroidal loop (C).
Coronal Mass Ejections (CME's) are giant bubbles of gas whose structures are dictated by magnetic field lines that are ejected from the sun over the course of a few hours.
Io also cuts across Jupiter's magnetic field lines, generating an electric current. Though small compared to the tidal heating, this current may carry more than 1 trillion watts.
Typically, objects emit X-ray radiation as synchrotron emission (produced by electrons oscillating around magnetic field lines), thermal emission from thin gases (called bremsstrahlung radiation) that is above 107 (10 million) kelvins, ...
SYNCHROTRON EMISSION - Type of non-thermal radiation generated by charged particles (usually electrons) spiraling around magnetic field lines at close to the speed of light.
Radio galaxies are usually elliptical or elliptical-like galaxies that are strong sources of radio sychrotron emission (emission produced by electrons moving nearly at the speed of light while spiraling around magnetic field lines).
As these particles spiral back and forth along the magnetic field lines, they come down into the atmosphere near the north and south magnetic poles where the magnetic field lines disappear into the body of the Earth.
The white dwarf's strong gravitational field accretes material from the neighbouring star, which then flows down the white dwarf's magnetic field lines on to its surface and cools, emitting intense optical, ultraviolet and X-ray radiation.
As these electrons spiral around the magnetic field lines, they continue to radiate for thousands of years. In some cases the star itself continues to be a source of radio emission and is referred to as a radio star.
Imaginary lines used to visualize a magnetic field. Magnetic field lines are related to the strength of the magnetic object's influence and point in the same direction as a compass needle would.
Magnetopshere ...
Voyager 1 saw evidence of a transition from closed magnetic field lines to a magnetotail on the antisolar side of Jupiter. Although such a magnetotail was never in serious doubt, its existence had not been confirmed before.
Thus, we believe that there are magnetic field lines joining the two sunspots of a pair. The strong magnetic field locks the gas of the photosphere in places and inhibits the hotter gas below to rise at the sunspots.
Coronal holes are closely associated with those regions on the Sun that have an "open" magnetic geometry, that is, the magnetic field lines associated with them extend far outward into interplanetary space, ...
The protons spiral around and down the magnetic field lines of the Earth and penetrate into the atmosphere near the magnetic poles increasing the ionization of the D and E layers.
As these bursts of solar wind rise above the Sun's corona, they move along the Sun's magnetic field lines and increase in temperature up to tens of millions of degrees. These bursts release up to 220 billion pounds (100 billion kg) of plasma.
The magnetic field is three-dimensional. Generates and sustains magnetic fields that are turbulent. The Alfvén waves are vibrations in the magnetic field lines. The waves propagate along the field lines. This force is the new dynamic element.
Coronal Hole - A low density, dim region in the Sun's corona. Coronal holes occur in regions of open magnetic field lines where gases can flow freely away from the Sun to form the solar wind ...
Magnetosphere: The region around Earth dominated by Earth's magnetic field. In this region, the Earth's magnetic field lines guide the motions of charged particles (ions and electrons).
The particles travel along Jupiter's magnetic field lines. This is the same mechanism that causes auroras on Earth. These images were obtained by the Solid State Imaging (SSI) system on the Galileo spacecraft.
Now a rapidly spinning strong magnetic field can produce radiation as particles are accelerated along the magnetic field lines. Thus the magnetic fields produce beams of radiation along the magnetic pole directions.
These "fingers" can drag the magnetic field lines along with them, thus both enhancing and aligning the magnetic field. This result is evident in the example of a supernova remnant in the diagram to the right, from Chevalier (1977): ...
Aurora emissions, similar to Earth's Northern Lights, have been observed at Jupiter's poles and appear to be related to material from Io that spirals along magnetic field lines eventually falling into Jupiter's atmosphere.
The entrapment of magnetic field lines by a perfectly conducting fluid. If a magnetic field is somehow established in a fluid with infinite conductivity, a motion of the fluid will carry the field lines and hence the field energy with it.
 See also: Field, Magnetic Field, Solar, Sun, Earth
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