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sunspots    音标拼音: [s'ʌnsp,ɑts]

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  • Sunspot - Wikipedia
    Sunspots are temporary spots on the Sun's surface that are darker than the surrounding area They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection
  • Sunspots - NASA Science
    Sunspots are the visible component of active regions, areas of intense and complex magnetic fields on the Sun that are the source of solar eruptions Sunspots can be seen on the Sun’s photosphere, or visible surface of the Sun
  • Sunspot regions | Solar activity | SpaceWeatherLive. com
    Sunspot regions Help On this page you'll find an overview of all the visible sunspot regions on the Sun together with their properties, images and the chances on solar flares or proton events This page is updated daily and the sunspot images every hour
  • Sunspots: What are they, and why do they occur? - Space. com
    Sunspots are dark, planet-size regions of strong magnetic fields on the surface of the sun They can spawn eruptive disturbances such as solar flares and coronal mass ejections (CMEs)
  • Sunspots Solar Cycle - NOAA NWS Space Weather Prediction Center
    Sunspots appear in a wide variety of shapes and forms The darkest area of a sunspot (also the first to be observed) is called the umbrae As the sunspot matures (becomes more intense), a less dark, outlying area of well-defined fibril-like structure develops around the umbrae - called penumbra
  • Sunspots - Definition, Formation, Solar Cycle, and Effects
    Sunspots are temporary, darkened regions on the Sun ’s visible surface (the photosphere) caused by intense magnetic activity that inhibits convection and lowers local temperature Although they appear dark by contrast with the surrounding solar surface, sunspots are still extremely hot and luminous Their number and distribution vary over an approximately 11-year solar cycle and are closely
  • What causes sunspots? - Astronomy Magazine
    Sunspots are dark regions on the Sun that are about the size of Earth They are caused by strong magnetic fields that emerge through the photosphere, or surface, of the Sun
  • Sunspot | Solar Flares, Magnetic Fields Sunspots | Britannica
    Sunspots are never seen exactly at the equator or near the poles George Ellery Hale in 1908 discovered their magnetic fields, which are about 2,000–4,000 gauss in strength
  • Sunspots and Solar Flares - NASA Space Place
    Why are sunspots relatively cool? It’s because they form at areas where magnetic fields are particularly strong These magnetic fields are so strong that they keep some of the heat within the Sun from reaching the surface In this image, you can see an active region on the sun with dark sunspots
  • The Sun and Sunspots - National Weather Service
    Sunspots are areas where the magnetic field is about 2,500 times stronger than Earth's, much higher than anywhere else on the Sun Because of the strong magnetic field, the magnetic pressure increases while the surrounding atmospheric pressure decreases





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