関連する実験動画

Updated: Jul 12, 2026

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
06:48

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

初期パイオニアの金星の磁場結果:夜間観測

C T Russell, R C Elphic, J A Slavin

    Science (New York, N.Y.)
    |July 6, 1979
    PubMed
    まとめ

    ヴィーナス・パイオニア磁気計は,ヴィーナスの適度な強い夜間磁場を検出した. しかし,これらの水平で変動する磁場は,内部ダイナモの証拠はほとんどなく,弱い内在磁気モメントを示唆しています.

    さらに関連する動画

    Scattering And Absorption of Light in Planetary Regoliths11:34

    Scattering And Absorption of Light in Planetary Regoliths

    Published on: July 1, 2019

    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface06:14

    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

    Published on: July 30, 2020

    関連する概念動画

    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...
    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:
    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 Fields01:28

    Magnetic Fields

    A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
    A magnetic field is defined by the force that a charged particle experiences...
    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...
    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...