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File:SDOHMIdoppler sunspot.png

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English: The Solar Dynamics Observatory (SDO) observes the Sun with many different instruments, in many different wavelengths of light. Many of these capabilities are not possible for ground-based observatories - hence the need for a space-based observing platform.

The Helioseismic Magnetic Imager (HMI) aboard the Solar Dynamics Observatory takes a series of images every 45 seconds in a very narrow range of wavelengths in visible light of the solar photosphere. The wavelengths correspond to a region around the 6173 Ångstroms (617.3 nanometers) spectral line of neutral iron (Fe I). From this series of images, it constructs a set of images which extract other characteristics of the photosphere. For this dataset, it measures the shifting of the spectral lines to determine the velocity of gas flows on the solar surface. This spectral line shift is due to the Doppler effect. Blue represents motion towards the observer. Red indicates motion away from the observer.

In images above, the color is dominated by the solar rotation, so the solar limb on the right is moving away from us (and therefore red) while the left limb is moving towards us (and therefore blue). Motions on the solar surface generate the rippling in the color and you can see evidence of surface flows around the sunspot near the left limb.
Date
Source http://svs.gsfc.nasa.gov/vis/a000000/a003900/a003990/ , http://svs.gsfc.nasa.gov/vis/a000000/a003900/a003990/frames/4096x4096_1x1_30p/Doppler-Time/HMIdopplergram_20110925T080002.tif
Author NASA/Goddard Space Flight Center Scientific Visualization Studio

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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5 June 2014

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current09:59, 5 June 2014Thumbnail for version as of 09:59, 5 June 2014831 × 410 (556 KB)Stigmatella aurantiacaUser created page with UploadWizard

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