相关实验视频
Updated: Jun 29, 2025

06:14
Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
Published on: July 30, 2020
4.9K
一个太阳循环时钟用于极端的太空天气.
S C Chapman1,2,3, T Dudok de Wit4,5
1Physics Department, Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, UK. S.C.Chapman@warwick.ac.uk.
Scientific reports
|April 8, 2024
概括
当太阳活动区域向太阳赤道移动时,极端太空天气事件会被关闭. 这一发现解释了在地磁活动中观察到的两部分太阳周期.
科学领域:
- * 太阳物理学和太空天气.
- * 地磁和太阳与地球的相互作用.
背景情况:
- * 太阳的可变太阳周期影响地球的太空天气,影响社会.
- * 约11年的施瓦贝周期的可变长度是一个挑战.
- * aa指数提供了最长的地磁活动连续记录.
研究的目的:
- * 用物理来解释AA指数中观察到的两部分循环.
- * 为了将极端太空天气事件与太阳活动特征相关联.
- * 了解太阳周期动力学对太空天气的调制.
主要方法:
- * 将希尔伯特变换应用于太阳黑子数量,以创建统一的太阳时钟.
- * 自1874年以来,与太阳活动区域区域和度相关的地磁数据 (aa指数) 相关联.
- *分析了太阳能活跃区域分布和太空天气事件发生之间的关系.
主要成果:
- * 当太阳活动区域集中在太阳赤道附近 (<15°) 时,极端太空天气事件就会停止.
- * 这种过渡将活跃区域从高梯度差分旋转区域转移到几乎恒定的旋转区域.
- *与27天的太阳旋转相关的温和太空天气事件,开始于活跃区域的中心离赤道靠近时.
- * 这解释了AA指数中先前识别的两部分活动周期.
结论:
- *与太阳赤道相对的太阳活性区域分布是太空天气事件类型的关键驱动因素.
- * 活跃区域向赤道的过渡通过改变太阳微分旋转形状来抑制极端的太空天气.
- * 这为地磁记录中观察到的太阳活动周期的不同组成部分提供了一个物理机制.
相关概念视频
What is Weather?
18.2K
Overview
18.2K
Biological Clocks and Seasonal Responses
34.6K
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
34.6K
Faraday Disk Dynamo
2.2K
A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
2.2K
Magnetic Declination
46
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...
46
Masonry in Cold and Hot Weather Conditions
87
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
Other key practices include keeping masonry units...
87
Conditions on Early Earth
91.7K
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
91.7K

