Telescopic Observations:

MARTIN, LEONARD J.; James, P. B.; DOLLFUS, AUDOUIN; Iwasaki, K.; BEISH, JEFFREY D.

doi:10.2307/j.ctt207g59v.6

Cited by 7 publications

(4 citation statements)

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“…Morphological features and optical characteristics of Martian clouds have been secured by several techniques (Table 1). Slipher (1962) and Martin et al (1992) summarize the morphological features of clouds observed by ground-based telescopes.…”

Section: Introductionmentioning

confidence: 99%

Diurnal variation of Martian water-ice clouds in Tharsis region of the low latitude cloud belt: Observations in 1995–1999 apparitions

Akabane

Nakakushi²,

Iwasaki³

et al. 2002

A&A

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Abstract. We investigated diurnal variations of water-ice clouds in the Tharsis region of Mars in the three apparitions from 1995 to 1999. The Tharsis morning cloud, centered near a point (120• W, 10• N) between Olympus Mons and Tharsis Montes, was the brightest among the morning clouds in Tharsis. Its optical thickness was about 0.6 near 9.5 h Martian local time and reduced to a minimum of about 0.2 around local noon in 1995. The minimum optical thickness was 0.4 in 1997, which also appeared around local noon. The optical thickness of the Tharsis morning cloud increased again in the early or mid afternoon in 1995 and 1997. In the late morning when the brightness of the morning cloud declined, bright afternoon clouds appeared over the major volcanoes in Tharsis. The optical thickness of the afternoon cloud over Olympus Mons was about 0.7 in the early afternoon in early summer, 1997. The Olympus afternoon cloud seems to be more active in early summer than in the first half of late spring. Those morning and afternoon clouds repeat the diurnal variation from late spring to at least early summer every Martian year.

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Section: Introductionmentioning

confidence: 99%

Diurnal variation of Martian water-ice clouds in Tharsis region of the low latitude cloud belt: Observations in 1995–1999 apparitions

Akabane

Nakakushi²,

Iwasaki³

et al. 2002

A&A

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“…They are associated with very cold atmospheric temperatures at medium to high latitudes during the fall, winter, and spring seasons (Haberle et al 2017). Specifically, the NPH has been observed since very early telescopic observations (e.g., Martin et al 1992), and NPH clouds are prevalent near the edge of the seasonal polar cap in the spring and late summer and early fall, forming the polar hood (e.g., Briggs & Leovy, 1974;Tamppari et al 2003). Tamppari et al (2008) show the spatial and seasonal changes of NPH water-ice clouds using data provided by the TES, covering nearly three northern spring and summer periods.…”

Section: Introductionmentioning

confidence: 99%

Geometric Properties of Water-ice Clouds as Observed from Jezero Crater in the First 600 sols with the NavCam Instrument On Board the Mars2020 Rover, Perseverance

Patel,

Tamppari,

de la Torre Juárez

et al. 2023

Planet. Sci. J.

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In the first 600 sols of the Mars2020 mission, LS 5.6o – 316.8o, 46 cloud movies and 145 cloud surveys were collected to observe clouds at Jezero Crater, the landing site of the Perseverance Rover. Cloud movies were processed using the Mean-Frame Subtraction (MFS) method for revealing cloud structures, which were subsequently analyzed using digital-image processing. Two-dimensional Fast Fourier Transforms (2D-FFT) were used to compute cloud structure sizes ranging from 2.90 to 15.25 km for clouds between 30 and 50 km altitude, based on coincident Mars Climate Sounder vertical profiles of atmospheric water-ice. Same-value thresholding was used to detect the cloud structures in MFS-processed and projected cloud movies. The resolution dependence that was needed to resolve these structures over various thresholds was examined to find multifractal scaling of Mars clouds for resolutions between 0.1 and 1.6 km. We characterize the multiscaling observed in the images and its implications for the design of cloud-tracking cameras from the surface as well as for cloud-resolving models.

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“…Opportunity's arrays were cleaned by the wind blowing dust off of its solar arrays. Spirit's solar 1 1 978-1-4244-2622-5/09/$25.00 ©2009 IEEE The United Sates Government has a royalty-free license to exercise all rights under the copyright claimed herein for Governmental purposes. 2 IEEEAC Paper #1565, Revision 4, Updated 26 January 2009 arrays accumulated a significant amount of dust as no cleaning events were experienced.…”

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confidence: 97%

“…1,2 This dust storm was the first global dust storm to occur while the twin Mars Exploration Rovers (MER) began surface operations. It is estimated that the dust in the atmosphere prevented over 99.6% of direct sunlight from reaching the surface at the peak of the storm.…”

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confidence: 99%

Operations strategies for the Mars Exploration Rovers during the 2007 Martian global dust storm

Seibert

Herman

ElDeeb

2009

2009 IEEE Aerospace Conference

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In June and July 2007 Mars experienced a dust storm that grew to envelop all but the polar latitudes of the planet. 1, 2 This dust storm was the first global dust storm to occur while the twin Mars Exploration Rovers (MER) began surface operations. It is estimated that the dust in the atmosphere prevented over 99.6% of direct sunlight from reaching the surface at the peak of the storm. Data collected indicated that solar array energy output was reduced to approximately 15% of maximum.The reduction in insolation and energy output posed the greatest risk of ending the mission for both rovers at that time.To maintain the health of the rovers, the sequencing team modified the nominal planning strategy to reduce power consumption to levels matching solar array energy generation. Existing planning and sequencing tools were used in new ways to increase confidence in the modeled state of the rover, including the power state. This paper will discuss the process used to predict the state of the rover during the storm.As the storm began to subside, the dust began to fall out of the atmosphere. Opportunity's arrays were cleaned by the wind blowing dust off of its solar arrays. Spirit's solar 1 1 978-1-4244-2622-5/09/$25.00

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Telescopic Observations:

Cited by 7 publications

References 0 publications

Diurnal variation of Martian water-ice clouds in Tharsis region of the low latitude cloud belt: Observations in 1995–1999 apparitions

Diurnal variation of Martian water-ice clouds in Tharsis region of the low latitude cloud belt: Observations in 1995–1999 apparitions

Geometric Properties of Water-ice Clouds as Observed from Jezero Crater in the First 600 sols with the NavCam Instrument On Board the Mars2020 Rover, Perseverance

Operations strategies for the Mars Exploration Rovers during the 2007 Martian global dust storm

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