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Since all objects on the Earth's surface move through a circle every 24 hours, there must be a net centripetal force on each object, directed towards the center of that circle. The points of the north and south poles are the only exception to this rule.
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An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Scattering And Absorption of Light in Planetary Regoliths
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Las "rayas de cebra" impulsadas rotativamente en el cinturón de radiación interior de la Tierra.

A Y Ukhorskiy1, M I Sitnov1, D G Mitchell1

  • 1Applied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Rd, Laurel, Maryland 20723, USA.

Nature
|March 21, 2014
PubMed
Resumen
Este resumen es generado por máquina.

La rotación de la Tierra crea sorprendentes "rayas de cebra" en las distribuciones de electrones del cinturón de radiación, incluso durante la baja actividad solar. Este descubrimiento desafía las suposiciones anteriores sobre la dinámica de partículas en la magnetosfera de la Tierra.

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Área de la Ciencia:

  • Física del espacio Física del espacio
  • Física del plasma es la física del plasma.
  • La astrofísica es la astrofísica.

Sus antecedentes:

  • Anteriormente, las distribuciones de partículas del cinturón de radiación estructurado estaban vinculadas únicamente a la actividad del viento solar.
  • El papel de la rotación planetaria en la aceleración de partículas se consideró significativo para los gigantes gaseosos, pero insignificante para la magnetosfera interna de la Tierra debido a los bajos campos eléctricos inducidos.

Objetivo del estudio:

  • Para investigar la causa de las distribuciones de electrones energéticos estructurados observados en el cinturón de radiación interior de la Tierra.
  • Para determinar si la rotación planetaria influye en la dinámica del cinturón de radiación bajo condiciones de viento solar bajo.

Principales métodos:

  • Análisis de los datos de distribución de electrones energéticos en el cinturón de radiación interior de la Tierra.
  • Modelado magnetohidrodinámico (MHD) para simular la dinámica de las partículas y las interacciones de campo.
  • Investigar las interacciones de resonancia entre los campos inducidos por la rotación de la Tierra y los electrones atrapados.

Principales resultados:

  • Se observaron patrones altamente estructurados de "estrías de cebra" en las distribuciones de electrones energéticos a través del cinturón de radiación interior, que persisten incluso durante la baja actividad del viento solar.
  • El modelado confirmó que la rotación de la Tierra es el principal impulsor de estos patrones de rayas observados.
  • Interacciones resonantes identificadas entre variaciones diurnas en campos magnéticos y eléctricos (inducidas por la rotación) y electrones con períodos de deriva cercanos a las 24 horas.

Conclusiones:

  • La rotación de la Tierra juega un papel significativo, no reconocido previamente, en la estructuración de las poblaciones de electrones energéticos en el cinturón de radiación interior.
  • Los hallazgos desafían la visión de larga data de que la rotación es inconsecuente para la dinámica del cinturón de radiación de la Tierra.
  • Estos patrones inducidos por la rotación demuestran un mecanismo fundamental que influye en el comportamiento de las partículas energéticas en las magnetosferas planetarias.