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WELCOME TO NASA's HINODE WEBSITE!
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New Cycle Spot Appears for a Few Days
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NOAA active region 10990 (AR 10990) became large enough to number on April 15, but faded by 17 April. The image on the left shows a close-up of that region in the light of Calcium II (CaII), while the image on the right shows the pointing of Hinode on the disk of the Sun. The Calcium II H absorption line corresponds to a wavelength of 396.9 nm. For more information on absorption lines as related to the Sun, see the
National Solar Observatory's Answerbook.
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15 April 2008 SOHO/MDI Intensity Image and Magnetogram:
The images above are from the SOlar and Heliospheric Observatory's (SOHO) Michelson Doppler Imager (MDI). The magnetograph image on the right represents positive polarity magnetic field with white and negative polarity with black. New cycle spots in the northern hemisphere will appear with negative polarity on the western (right) side of the sunspot. Old cycle spots that appear in the northern hemisphere will have positive polarity on the western side (and will also be close to the equator).
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The solar surface (photosphere) on 22 April 2008 has no numbered spots (see the Solar Monitor). In the last two days, there have been no flares (as seen by GOES ). For an explanation of flare classes, go to Space Weather's Classification of X-ray Solar Flares.
More Hinode XRT images may be found at the Smithsonian Astrophysical Observatory (SAO).
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