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相关概念视频

The Electromagnetic Spectrum02:37

The Electromagnetic Spectrum

The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
Precipitation of Ions03:11

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The Electromagnetic Spectrum01:24

The Electromagnetic Spectrum

Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed to be a...
Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
Standing Electromagnetic Waves01:15

Standing Electromagnetic Waves

Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...

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相关实验视频

Updated: May 11, 2026

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
13:02

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

Published on: February 27, 2016

在雷云和电离层之间产生巨大的喷气.

H T Su1, R R Hsu, A B Chen

  • 1Department of Physics, National Cheng Kung University, Tainan, 70148, Taiwan. htsu@phys.ncku.edu.tw

Nature
|June 27, 2003
PubMed
概括

巨大的喷气直接将雷云与电离层联系起来,揭示了地球全球电路的新组成部分. 这些排放,与闪电不同,降低了电势,需要对大气电的理解进行修订.

科学领域:

  • 大气物理大气物理学
  • 航空学是航空学的.
  • 电磁主义 电磁主义

背景情况:

  • 地球的全球电路通常包括雷暴,电离层和电流.
  • 短暂的发光事件,如和蓝色喷射,发生在云和电离层之间.
  • 全球电路的完整组件尚未完全理解.

研究的目的:

  • 为了研究巨大的喷射在地球全球电路中的作用.
  • 为了确定雷云和电离层之间的电气连接.
  • 了解这些事件期间极低频无线电波的生成机制.

主要方法:

  • 观测了五个巨大的喷气事件.
  • 检测极低频 (ELF) 无线电波.
  • 分析云与电离层之间的大气电放电.

主要成果:

  • 观察到巨大的喷流直接连接雷云 (16公里) 与电离层 (90公里).
  • 在四次事件中检测到极低频无线电波,表明云对离子层负放电.
  • 在这些巨大的喷气事件之前,没有云到地面的闪电.

结论:

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  • 巨大的喷气体代表了全球电路中的重要通道.
  • 这些放电减少了电离层和地面之间的电潜力.
  • 全球电路的常规模型需要修改,包括巨大的喷气机和sprites.