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sunspot    音标拼音: [s'ʌnsp,ɑt]
n. 太阳的黑点,雀斑

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  • Sunspot - Wikipedia
    Solar cycles last typically about eleven years, varying from just under 10 to just over 12 years Over the solar cycle, sunspot populations increase quickly and then decrease more slowly The point of highest sunspot activity during a cycle is known as solar maximum, and the point of lowest activity as solar minimum
  • Sunspots: What are they, and why do they occur? | Space
    Sunspot positions also change throughout the solar cycle During the solar maximum, many sunspots are found along mid-latitudes (approximately 30 degrees north and 30 degrees south)
  • Sunspot regions | Solar activity | SpaceWeatherLive. com
    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 - Solar and Heliospheric Observatory
    NOTICE: There is an image outage of the Sunspot images due to a cooling water line burst in the Joint Science Operations Center (JSOC) at Stanford University on 2024-11-26 The images are provided by the Solar Dynamics Observatory (SDO) mission
  • Sunspots and Solar Flares - NASA Space Place
    They appear dark because they are cooler than other parts of the Sun’s surface The temperature of a sunspot is still very hot though—around 6,500 degrees Fahrenheit! Why are sunspots relatively cool? It’s because they form at areas where magnetic fields are particularly strong
  • Sunspots - NASA Science
    This video, captured by NASA’s Solar Dynamics Observatory between July 5 to 11, 2017, shows a sunspot moving across the Sun Like freckles on the face of the Sun, sunspots appear to be small features, but size is relative: The dark core of this sunspot is actually larger than Earth
  • Sunspot | Solar Flares, Magnetic Fields Sunspots | Britannica
    sunspot, vortex of gas on the surface of the Sun associated with strong local magnetic activity Spots look dark only by contrast with the surrounding photosphere, which is several thousand degrees hotter The dark centre of a spot is called the umbra; the outer, lighter ring is the penumbra
  • Sunspots - Center for Science Education
    If you could cut an average sunspot out of the Sun and place it elsewhere in the night sky, it would be about as bright as the full Moon Sunspots have a lighter, outer section called the penumbra and a darker, central region named the umbra
  • 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 and the Solar Cycle | NESDIS | National Environmental . . .
    The solar cycle is a roughly 11-year periodic change in the Sun's sunspot activity, measured by the variation in the number of sunspots observed Humans used telescopes to observe sunspots and solar cycles as early as the 17th Century; however, NOAA and NASA satellites are now major ways scientists use to study the Sun





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