File:Seasonal Changes in Mars North Polar Ice Cap (opo9715b3).jpg

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Seasonal_Changes_in_Mars_North_Polar_Ice_Cap_(opo9715b3).jpg (600 × 600 pixels, file size: 56 KB, MIME type: image/jpeg)

Captions

Captions

Increased warming as spring progresses in the northern hemisphere has sublimated the carbon dioxide ice and frost below 70 degrees north latitude.

Summary

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Description
English: Increased warming as spring progresses in the northern hemisphere has sublimated the carbon dioxide ice and frost below 70 degrees north latitude. The faint darker circle inside the cap boundary marks the location of circumpolar sand dunes (see March '97 map); these dark dunes are warmed more by solar heating than are the brighter surroundings, so the surface frost sublimates from the dunes earlier than from the neighboring areas.Particularly evident is the marked hexagonal shape of the polar cap at this season, noted previously by HST in 1995 and Mariner 9 in 1972; this may be due to topography, which isn't well known, or to wave structure in the circulation. This map was assembled from WFPC2 images obtained between Dec. 30, 1996 and Jan. 4, 1997.
Date 20 May 1997 (upload date)
Source Seasonal Changes in Mars North Polar Ice Cap
Author Phil James (Univ. Toledo), Todd Clancy (Space Science Inst., Boulder, CO), Steve Lee (Univ. Colorado), and NASA/ESA
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Licensing

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Public domain
This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.

The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org.

For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag.

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current15:06, 23 June 2024Thumbnail for version as of 15:06, 23 June 2024600 × 600 (56 KB)OptimusPrimeBot (talk | contribs)#Spacemedia - Upload of https://cdn.esahubble.org/archives/images/large/opo9715b3.jpg via Commons:Spacemedia

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