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That heat history holds clues to the mechanisms that drive the temperature and movements of the sun's atmosphere, or corona.To look at the corona from a fresh perspective, Viall created a new kind of picture, making use of the high resolution provided by NASA's Solar Dynamics Observatory (SDO). SDO's Atmospheric Imaging Assembly (AIA) provides images of the sun in 10 different wavelengths, each approximately corresponding to a single temperature of material. Therefore, when one looks at the wavelength of 171 angstroms, for example, one sees all the material in the sun's atmosphere that is a million degrees Kelvin. By looking at an area of the sun in different wavelengths, one can get a sense of how different swaths of material change temperature. If an area seems bright in a wavelength that shows a hotter temperature an hour before it becomes bright in a wavelength that shows a cooler temperature, one can gather information about how that region has changed over time.Viall's images show a wealth of reds, oranges, and yellow, meaning that over a 12-hour period the material appear to be cooling. Obviously there must have been heating in the process as well, since the corona isn't on a one-way temperature slide down to zero degrees. Any kind of steady heating throughout the corona would have shown up in Viall's images, so she concludes that the heating must be quick and impulsive — so fast that it doesn't show up in her images. This lends credence to those theories that say numerous nanobursts of energy help heat the corona. || ", "release_date": "2012-07-19T10:00:00-04:00", "update_date": "2023-05-03T13:52:55.201130-04:00", "main_image": { "id": 474224, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011000/a011046/Van_Gogh_Sun_Still_1.jpg", "filename": "Van_Gogh_Sun_Still_1.jpg", "media_type": "Image", "alt_text": "Narrated video.For complete transcript, click here.", "width": 1280, "height": 720, "pixels": 921600 } } ], "newer_versions": [], "older_versions": [], "alternate_versions": [] }