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関連する概念動画

Apparent Weight and the Earth's Rotation01:28

Apparent Weight and the Earth's Rotation

2.9K
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.
For an object on the Earth's equator, the net centripetal force that accounts for its rotation is the Earth's pull towards its center, or the weight minus the normal force that prevents it from piercing into the Earth's surface....
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Variation in Acceleration due to Gravity near the Earth's Surface01:20

Variation in Acceleration due to Gravity near the Earth's Surface

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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.
The difference between the true and apparent weights is proportional to the square of the Earth's...
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Doppler Effect - I00:56

Doppler Effect - I

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The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
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Doppler Effect - II01:05

Doppler Effect - II

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Scattering And Absorption of Light in Planetary Regoliths
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Scattering And Absorption of Light in Planetary Regoliths

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地球の内部の放射線帯に回転的に駆動された"ゼブラストライプ"があります.

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
まとめ
この要約は機械生成です。

地球の自転は,低い太陽活動でも,放射線帯の電子分布に驚くべき"ゼブラストライプ"を生み出します. この発見は,地球の磁気圏における粒子の動力学に関する以前の仮定に異議を唱えている.

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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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関連する実験動画

Last Updated: Apr 30, 2026

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Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys
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科学分野:

  • 宇宙物理学 宇宙物理学
  • プラズマ物理学 プラズマ物理学
  • 天体物理学 天体物理学

背景:

  • 以前は,構造化放射線帯の粒子分布は,太陽風の活動にのみ関連していた.
  • 粒子の加速における惑星回転の役割は,ガス巨人にとっては重要と考えられていましたが,低誘導電場のため,地球の内部の磁気圏では無視できます.

研究 の 目的:

  • 地球の内部の放射線帯で観測された構造的なエネルギー電子分布の原因を調査する.
  • 惑星の自転が,低太陽風の条件下での放射線帯のダイナミクスを影響するかどうかを判断する.

主な方法:

  • 地球の内部の放射線帯におけるエネルギー電子分布データの分析.
  • 粒子動力学とフィールド相互作用をシミュレートするための磁気水力学 (MHD) モデリング.
  • 地球の自転が誘発する場と閉じ込められた電子の間の共鳴相互作用を調査する.

主要な成果:

  • 内部放射線帯のエネルギー電子分布における高度に構造化された"ゼブラストライプ"パターンが観察され,低太陽風活動でも持続しています.
  • モデリングは,地球の自転がこれらの観察されたストライプパターンの主要なドライバーであることを確認しました.
  • 磁場と電場 (回転によって引き起こされる) の昼間変動と,24時間近くの漂流周期を持つ電子との間の共鳴相互作用を特定した.

結論:

  • 地球の自転は,内部放射線帯内のエネルギー電子集団の構造化において,以前は認識されなかった重要な役割を果たしています.
  • この発見は,回転が地球の放射線帯動力学にとって無意味であるという長年の見解に異議を唱えている.
  • これらの回転誘発パターンは,惑星の磁気圏におけるエネルギー粒子行動に影響を与える基本的なメカニズムを示しています.