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Last Post 18 Oct 2012 04:01 PM by  Yan Li
CME/Solar Storms
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Anonymous





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14 Oct 2012 10:28 PM
    How can the speed of a solar CME be predicted?
    Tags: CME, coronal mass ejections, STEREO, speed, active region, solar wind

    Terry Kucera



    Basic Member


    Posts:328
    Basic Member


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    15 Oct 2012 06:29 AM
    Hi,

    At this point we can't predict the speed of a CME before it happens. If we see an especially large, complex active region on the Sun we might think it would be more likely to produce a powerful, high-speed CME, but that is not very certain and not a very specific sort of prediction.

    Once a CME has started we can measure its speed closer to the Sun by looking at the location of the CME (see http://www-istp.gsfc.nasa.gov/istp/...ure.html), and then try to predict how long it will take to get to the Earth. To do that it is helpful to have telescopes looking at the Sun from a few different points of view (e.g., STEREO - http://www.nasa.gov/mission_pages/s...ndex.html) and to use models of how CME's interact with the rest of the solar wind. We have gotten better at that sort of prediction.

    Cheers, Terry



    Kris Sigsbee



    Basic Member


    Posts:415
    Basic Member


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    15 Oct 2012 09:48 AM

    Hello,

    You can also determine the speed of CMEs under certain circumstances using images from a single spacecraft. The web site below has links to some activities you can do with your parents or teacher to see how this works:

    http://www.haystack.mit.edu/edu/pcr/Solar/

    Scroll down the page to and look for "The Sun's Influence on Earth" and look for the Activities called

    Kris


    Yan Li



    New Member


    Posts:55
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    18 Oct 2012 04:01 PM
    Hi, You asked the most important question in Space Weather research! I am not writing more answers, because the two answers you got are excellent! Yan
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