Tag Archives: frost

HiRISE: A nice place for frost

Posted on July 7, 2015 by rburnham

A nice place for frost. Beautiful Mars series.

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HiRISE: Active high-latitude dune gullies

Posted on June 22, 2015 by rburnham

Gully and defrosting activity have been visible here along the edge of a dune field, along with blocks of frost. Observations of the same area help us check for repeat activity, as well as measuring those meter-scale blocks that we’ve … Continue reading →

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HiRISE: Seasonal frost enhances polygon visibility

Posted on March 31, 2015 by rburnham

Unleash the Polygons! Beautiful Mars series.

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HiRISE: Frosty shoreline

Posted on February 12, 2015 by rburnham

The frosty shoreline. The frost is carbon dioxide, and the dark material is the result of sublimation, when a solid transforms directly to a gas, exposed now on lighter ground. Beautiful Mars series.

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HiRISE: Crater slopes: power of a repeat image

Posted on January 22, 2015 by rburnham

Why does HiRISE take so many repeat images of the same area? Repeat coverage actually serves a special purpose, such as detecting seasonal changes (frost deposition and sublimation) and temporal changes (dust devil tracks and avalanches.) These repeat images also … Continue reading →

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HiRISE: Frosty slopes in late spring

Posted on December 23, 2014 by rburnham

This HiRISE image, approximately 1.5 by 3 kilometers, shows frosted gullies on a south-facing slope within a crater. At this time of year only south-facing slopes retain the frost, while the north-facing slopes have melted. Gullies are not the only … Continue reading →

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HiRISE: Polar layered deposit slopes

Posted on December 19, 2014 by rburnham

This image, approximately 500 by 500 meters, represents a popular monitoring site; in this case a sample of the South Polar layered deposits (SPLD). These deposits are quite extensive and partially surround the South polar residual cap. In this beautiful … Continue reading →

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HiRISE: Dune field with seasonal frost & channels

Posted on December 18, 2014 by rburnham

Dune field with seasonal frost and small channels. Beautiful Mars series.

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HiRISE: Frosted gullies in a central pit

Posted on December 12, 2014 by rburnham

The frosted gullies in this observation are located along an irregularly shaped pit approximately 15 kilometers wide. The pit lies within an impact crater in Sisyphi Planum that is about 35 kilometers in diameter and is located northwards of the … Continue reading →

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HiRISE: Outbreak

Posted on September 16, 2014 by rburnham

Outbreak. These are examples of carbon dioxide frost around areas where the ice has sublimated (gone directly from a solid to a gas). Beautiful Mars series.

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