Tag Archives: atmosphere

MARCI weather report, May 13-19, 2019

Afternoon condensate water-ice clouds continued to be the dominant feature over all the major Martian volcanoes this past week. A few arcuate dust storms were observed along the edge of the seasonal north polar ice cap. On the other side … Continue reading

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MARCI weather report, May 6-12, 2019

We are now well into northern spring, and dust storm activity is picking up in the northern hemisphere. Numerous dust storms were observed near the seasonal north polar cap edge (presently ~60° N) throughout the past week. Several of these … Continue reading

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Lightning on Mars is probably rare and weak

[Editor’s note: From a paper by Gerhard Wurm and four co-authors recently published in Icarus.] A Challenge for Martian Lightning: Limits of Collisional Charging at Low Pressure • Collision experiments on identical grains show a strong dependence of charging on … Continue reading

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MARCI weather report, April 22-28, 2019

For the past week on Mars, numerous local-scale dust storms of varied size occurred along the southern highlands — below 50° S. latitude. Looking to the northern hemisphere, dust-lifting activity was more sporadic. A couple of arcuate (bow-shaped) dust storms … Continue reading

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MARCI weather report, April 15-21, 2019

Conditions poleward of 58° S were dusty as local storms continued to crop-up along the mid- to high-latitudes of Mars last week. Looking to the northern lowlands, a couple of long arcuate-shaped dust storms pressed southward over Acidalia near the … Continue reading

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MARCI weather report, April 8-14, 2019

Weather patterns were fairly typical across Mars this past week. Looking to the northern hemisphere, a couple of dust storms dipped southward towards southern Acidalia. Neighboring these events, a local-scale storm occurred over Tempe Terra near the beginning of the … Continue reading

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Trace Gas Orbiter: First science results

New evidence of the impact of the recent planet-encompassing dust storm on water in the atmosphere, and a surprising lack of methane, are among the scientific highlights of the ExoMars Trace Gas Orbiter’s first year in orbit. Two papers [here … Continue reading

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MARCI weather report, April 1-7, 2019

There was a slight uptick in dust storm activity across the southern highlands of Mars this past week. Repeated dust storms were spotted from southern Aonia to Cimmeria on several afternoons. Scanning further northward to the tropics, orographic water ice … Continue reading

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MAVEN completes orbit change for Mars 2020

MAVEN has achieved a tighter orbit around Mars to act as a telecommunications relay. The two-month campaign began February 11 and ended April 5. MAVEN’s navigation team slowed the spacecraft down gradually by aerobraking, a process taking advantage of the … Continue reading

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MAVEN: The magnetic tail of Mars

In this MAVEN outreach webinar from March 27, 2019, Dr. Gina DiBraccio from NASA’s Goddard Space Flight Center describes what makes the Martian magnetic environment so different from other planets, and how processes in its magnetotail may contribute to atmospheric … Continue reading

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