File:Neptune cloud cover over three decades (opo2319a).jpg
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[edit]DescriptionNeptune cloud cover over three decades (opo2319a).jpg |
English: This sequence of NASA/ESA Hubble Space Telescope images chronicles the waxing and waning of the amount of cloud cover on Neptune. This long set of observations shows that the number of clouds grows increasingly following a peak in the solar cycle – where the Sun’s level of activity rhythmically rises and falls over an 11-year period.The theory is that the increased ultraviolet radiation from the Sun, during its peak of activity, causes chemical changes deep in Neptune’s atmosphere. After a couple years this eventually percolates into the upper atmosphere to form clouds.In 1989, NASA’s Voyager 2 spacecraft provided the first close-up images of linear, bright clouds, reminiscent of cirrus clouds on Earth, seen high in Neptune’s atmosphere. They form above most of the methane in Neptune’s atmosphere and consequently are not blue, but reflect all colours of sunlight. Hubble picks up where the brief Voyager flyby left off by continually keeping an eye on the planet yearly.The findings are published in the journal Icarus.[Image description: This sequence of Hubble Space Telescope images chronicles the waxing and waning of the amount of cloud cover on Neptune taken in the years 1994, 1998, 2000, 2002 (top row) and 2006, 2010, 2015, 2020 (bottom row). The planet is blue (due to methane absorption of red light in its atmosphere) and the high-altitude, cirrus-like clouds are white. A comparison of Neptune’s cloud cover corresponds to peaks in the 11-year-long repeating solar cycle where the Sun’s level of activity rhythmically rises and falls.] |
Date | Taken in 2023 |
Source | Neptune cloud cover over three decades |
Author | NASA, ESA, E. Chavez (UC Berkeley), I. de Pater (UC Berkeley) |
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[edit]ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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Attribution: ESA/Hubble
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Author | Space Telescope Science Institute Office of Public Outreach |
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Source | ESA/Hubble |
Credit/Provider | NASA, ESA, E. Chavez (UC Berkeley), I. de Pater (UC Berkeley) |
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Date and time of data generation | 16:00, 17 August 2023 |
JPEG file comment | This sequence of Hubble Space Telescope images chronicles the waxing and waning of the amount of cloud cover on Neptune. This long set of observations shows that the number of clouds grows increasingly following a peak in the solar cycle – where the Sun’s level of activity rhythmically rises and falls over an 11-year period. The theory is that the increased ultraviolet radiation from the Sun, during its peak of activity, causes chemical changes deep in Neptune’s atmosphere. After a couple years this eventually percolates into the upper atmosphere to form clouds. In 1989, NASA’s Voyager 2 spacecraft provided the first close-up images of linear, bright clouds, reminiscent of cirrus clouds on Earth, seen high in Neptune’s atmosphere. They form above most of the methane in Neptune’s atmosphere and consequently are not blue, but reflect all colors of sunlight. Hubble picks up where the brief Voyager flyby left off by continually keeping an eye on the planet yearly. |
Software used | Adobe Photoshop 24.7 (Macintosh) |
File change date and time | 11:58, 9 August 2023 |
Date and time of digitizing | 13:27, 27 July 2023 |
Date metadata was last modified | 08:30, 9 August 2023 |
Unique ID of original document | xmp.did:32b40bdf-4f2b-429f-884f-32466478162b |
Keywords | Neptune |
Contact information | outreach@stsci.edu
ESA Office, Space Telescope Science Institute, 3700 San Martin Dr Baltimore, MD, 21218 United States |
IIM version | 4 |