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Videos de Conceptos Relacionados

Magnetic Field Lines01:19

Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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...
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...

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Video Experimental Relacionado

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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
06:46

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Published on: August 25, 2016

La identificación del conductor de las auroras pulsantes.

Y Nishimura1, J Bortnik, W Li

  • 1Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, USA. toshi@atmos.ucla.edu

Science (New York, N.Y.)
|October 9, 2010
PubMed
Resumen

Los científicos identificaron la causa de las auroras pulsantes, un fenómeno en las regiones polares de la Tierra. Se descubrió que las ondas de coro de banda baja impulsan la precipitación de electrones responsable de las brillantes pantallas aurorales.

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Área de la Ciencia:

  • Física del espacio Física del espacio
  • Ciencias de la atmósfera Ciencias atmosféricas.
  • Física del plasma es la física del plasma.

Sus antecedentes:

  • Las auroras pulsantes, caracterizadas por emisiones parpadeantes en las regiones polares, son causadas por la precipitación de electrones modulada.
  • El conductor específico de esta precipitación de electrones ha permanecido sin identificar, lo que plantea un desafío de larga data en la física espacial.

Objetivo del estudio:

  • Para identificar el conductor natural de la precipitación de electrones responsable de las auroras pulsantes.
  • Para establecer un vínculo directo entre ondas electromagnéticas específicas y eventos aurorales pulsantes.

Principales métodos:

  • Observaciones coordinadas utilizando datos satelitales de la misión THEMIS.
  • Observaciones simultáneas de imágenes de todo el cielo basadas en tierra.
  • Análisis de correlación entre la actividad de las ondas ecuatoriales y la dinámica del parche auroral.

Principales resultados:

  • Se encontraron pruebas directas que vinculan las ondas de coro de banda inferior que ocurren naturalmente con la excitación de la aurora pulsante.
  • Se observó una correlación uno a uno entre ubicaciones específicas de ondas ecuatoriales y parches aurorales pulsantes individuales.

Conclusiones:

  • Las ondas de coro de banda baja se confirman como el conductor de la aurora pulsante.
  • Estos hallazgos permiten restricciones más precisas del modelo de campo magnético al vincular con precisión las observaciones de ondas basadas en el espacio a los fenómenos atmosféricos.