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Related Concept Videos

Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Magnetic Declination01:19

Magnetic Declination

Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...

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Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
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Published on: July 14, 2021

Magnetometry with mesospheric sodium.

James M Higbie1, Simon M Rochester, Brian Patton

  • 1Department of Physics and Astronomy, Bucknell University, Lewisburg, PA 17837, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 16, 2011
PubMed
Summary
This summary is machine-generated.

We propose a novel, cost-effective method for remote magnetic field detection using the mesospheric sodium layer and high-power lasers. This technique enables large-scale geophysical and atmospheric mapping.

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Area of Science:

  • Geophysics
  • Atmospheric Science
  • Laser Physics

Background:

  • Geophysical magnetic field measurements at the 100-km scale are crucial but currently expensive or inaccurate.
  • Existing technologies limit large-scale magnetic mapping for applications like crustal magnetism and ocean circulation.

Purpose of the Study:

  • To introduce a cost-effective method for remote magnetic field detection.
  • To leverage the natural mesospheric sodium layer and existing laser technology for geophysical measurements.

Main Methods:

  • Utilizing the naturally occurring atomic sodium-rich layer in the mesosphere.
  • Employing existing high-power lasers, typically used for laser guide star applications.
  • Developing a remote sensing technique for magnetic field measurement.

Main Results:

  • The proposed method significantly reduces the cost of magnetic field measurement.
  • Enables large-scale, parallel magnetic mapping and monitoring.
  • Offers potential for improved accuracy in geophysical and atmospheric studies.

Conclusions:

  • The novel technique provides a viable and economical solution for remote magnetic field detection.
  • This approach expands possibilities for geophysical, atmospheric science, navigation, and geophysics applications.
  • Facilitates unprecedented large-scale magnetic field mapping and monitoring capabilities.