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Videos de Conceptos Relacionados

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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:
Polar Curves01:19

Polar Curves

The spirograph is a versatile tool for visualizing the relationship between geometry and mathematical representation. In particular, it demonstrates how polar coordinates offer an alternative framework for describing curves in comparison to Cartesian coordinates. Instead of specifying a point by its horizontal and vertical displacements (x, y), polar coordinates use a radius r, the distance from the origin, and an angle θ, measured counterclockwise from the polar axis. This system is...
Polar Equations of Conics01:29

Polar Equations of Conics

A conic section can be defined in polar coordinates as the set of all points whose distance from a fixed point, known as the focus, bears a constant ratio to their distance from a fixed line, known as the directrix. This constant ratio is called the eccentricity. This definition unifies all types of conic sections—ellipses, parabolas, and hyperbolas—under a single framework. When the focus is positioned at the origin of the polar coordinate system, a single polar equation can describe any conic...
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...
Polar Coordinates: Problem Solving01:27

Polar Coordinates: Problem Solving

Directional radiation patterns are central to antenna analysis, as they illustrate how signal strength varies with direction. These patterns are often modeled using polar plots, where the radial distance from the origin represents signal intensity at a given angle. A commonly used idealized form is the four-lobed rose curve, which captures the concept of directional beams in a simplified mathematical form.The four-lobed rose curve, described by r = cos⁡(2θ), features four symmetric lobes, each...

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Video Experimental Relacionado

Updated: Jul 12, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Los agujeros coronales polares y la modulación de rayos cósmicos.

A J Hundhausen, D G Sime, R T Hansen

    Science (New York, N.Y.)
    |February 15, 1980
    PubMed
    Resumen

    El tamaño del agujero coronal polar coincide con la intensidad de los rayos cósmicos durante el ciclo de las manchas solares. Esto sugiere que la modulación de rayos cósmicos es un efecto 3D vinculado al campo magnético interplanetario.

    Área de la Ciencia:

    • La física espacial es la física del espacio.
    • Heliofísica es la heliofísica.
    • La astrofísica es la astrofísica.

    Sus antecedentes:

    • La intensidad de los rayos cósmicos exhibe una variación cíclica vinculada al ciclo de las manchas solares.
    • Los mecanismos exactos que modulan los rayos cósmicos, particularmente durante un ciclo solar, aún están bajo investigación.
    • Estudios anteriores han propuesto que la actividad solar influye en la propagación de los rayos cósmicos.

    Objetivo del estudio:

    • Para investigar la relación entre el tamaño del agujero coronal polar y la intensidad de los rayos cósmicos.
    • Proporcionar evidencia que apoye la naturaleza tridimensional de la modulación de rayos cósmicos.
    • Explorar el papel del campo magnético interplanetario en la modulación del ciclo solar de los rayos cósmicos.

    Principales métodos:

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    • Comparación de datos de observación sobre el tamaño de los agujeros coronales polares.
    • Análisis de las mediciones de la intensidad de los rayos cósmicos.
    • Análisis de correlación durante el ciclo de manchas solares más reciente.

    Principales resultados:

    • Se observó una estrecha correspondencia entre el tamaño de los agujeros coronales polares y la intensidad de los rayos cósmicos.
    • Los hallazgos apoyan la hipótesis de que la modulación de rayos cósmicos es un fenómeno global tridimensional.
    • Los resultados indican un probable vínculo entre esta modulación y la estructura general del campo magnético interplanetario.

    Conclusiones:

    • El tamaño de los agujeros coronales polares es un indicador significativo de las variaciones de intensidad de los rayos cósmicos.
    • La modulación de los rayos cósmicos a lo largo del ciclo de las manchas solares es probablemente un efecto tridimensional.
    • La estructura global del campo magnético interplanetario juega un papel crucial en la modulación de los rayos cósmicos.