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#dustdevil

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Daniel Pomarède

On Dust Devil Diameters, Occurrence Rates, and Activity

"Where a typical terrestrial dust devil might span several to ten meters in diameter and hundreds of meters in height, Martian dust devil could be hundreds of meters across and kilometers tall."

by Brian Jackson and co-authors
arxiv.org/abs/2507.03643

arXiv.orgOn Dust Devil Diameters, Occurrence Rates, and ActivityAs a phenomenon that occurs on Earth and on Mars, the diameter of a dust devil helps determine the amount of dust the devil injects into the atmosphere for both worlds -- for a given dust flux density (dust lifted per area per time), a wider devil will lift more dust into the air. However, the factors that determine a dust devil's diameter $D$ and how it might relate to ambient conditions have remained unclear. Moreover, estimating the contribution to an atmospheric dust budget from a population of dust devils with a range of diameters requires an accurate assessment of the differential diameter distribution, but considerable work has yet to reveal the best representation or explain its physical basis. In this study, we propose that this distribution follows a power-law $\propto D^{-5/3}$ and provide a simple physical explanation for why the distribution takes this form. By fitting diameter distributions of martian dust devil diameters reported in several studies, we show that the data from several studies support this proposed form. Using a previous model that treats dust devils as thermodynamic heat engines, we also show that the areal density of dust devils (number per unit area) $N_0$ scales with the product of their thermodynamic efficiency $η$ and the sensible heat flux $F_{\rm s}$ as $N_0 \propto ηF_{\rm s}$.
#Mars#DustDevil#Science
Public
Daniel Pomarède

Very interesting post by Emma Harris [imperial.ac.uk/people/e.harris] on what Curiosity has been doing these past two days

☑️ targets: Dawn Wall, Banner Peak, Pinnacle Ridge, Kukenan butte
☑️ environmental monitoring including a 30 minutes dust devil movie and a suprahorizon movie

science.nasa.gov/blogs/sols-41

www.imperial.ac.ukHome - Miss Emma HarrisAbout me I am a first year PhD student based at the Natural History Museum. I am uncovering the geological history of Ma
#Curiosity#Mars#rover
Public
AI6YR Ben

CALFIRE LNU: At 3:57 p.m., Firefighters were dispatched after multiple callers reported seeing a black column of smoke in Hidden Valley near Highway 29 & Spruce Road. It was likely they saw this agressive dust devil that was captured on the
@ALERTCalifornia
Lower Lake Fire Camera. #dustdevil #holymoly #CAwx

"Aggressive dust devil" in Hidden Valley near Highway 29 -- shaft of angry dust flying by
ExplorerFlux en direct
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