Atmospheric acoustics of Titan, Mars, Venus, and Earth

Petculescu, Andi; Lueptow, Richard M.

doi:10.1016/j.icarus.2006.09.014

Cited by 49 publications

(36 citation statements)

References 20 publications

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“…6a are due 501 to spherical spreading only: this will be similar on all worlds, so for the most part is invisible when 502 comparing the four graphs. The sound speed on Mars is low [28], which would give a long detected signal 503 except that the absorption on Mars is the highest of the planets studied here, and so does not allow the 504 detected signal to persist (Fig. 6b).…”

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confidence: 91%

“…3a). Finally, effects of atmospheric 393 absorption on sound attenuation is added, following published theory [28,[64][65][66]. The mean flow speed variation in a typical dust devil was constructed from the literature [45,67,68], 412 modelling the velocity profile in all three directions.…”

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confidence: 99%

“…An ) in Fig. 6 reflect the effects of atmospheric absorption [28]. Figure 6a shows the baseline, the 500 thunder for the sound speed of Earth, but without any atmospherically absorption.…”

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confidence: 99%

“…6b). Venus has the highest sound speed, so would have the shortest signal if 505 no absorption were taken into account, although the received signal is dominated by the fact that at 506 frequencies above around 100 Hz its absorption is substantially greater than that of Earth's atmosphere 507 [28]. Titan has, by a substantial margin, the lowest sound speed and absorption, so that its thunder signal 508 persists the longest and contains significant high frequency information.…”

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confidence: 99%

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Extraterrestrial sound for planetaria: A pedagogical study

Leighton

Banda

Bergès

et al. 2016

The Journal of the Acoustical Society of America

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Abstract:The purpose of this project was to supply an acoustical simulation device to a local planetarium for use in live shows aimed at engaging and inspiring children in science and engineering. The device plays audio simulations of estimates of the sounds produced by natural phenomena to accompany audio-visual presentations and live shows about Venus, Mars and Titan. Amongst the simulated noise are the sounds of thunder, wind and cryo-volcanoes. The device can also modify the speech of the presenter (or audience member) in accordance with the underlying physics to reproduce those vocalisations as if they had been produced on the world under discussion. Given that no time series recordings exist of sounds from other worlds, these sounds had to be simulated. The goal was to ensure that the audio simulations were delivered in time for a planetarium's launch show to enable the requested outreach to children. The exercise has also allowed an explanation, in an ageappropriate way, of the science and engineering behind the creation of the sounds. This has been achieved for young children, and also for older students and undergraduates, who could then debate the limitations of that method, and how a fuller research programme might rectify them. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems CorporationExtraterrestrial sound for planetaria: a pedagogical study

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confidence: 91%

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confidence: 99%

“…An ) in Fig. 6 reflect the effects of atmospheric absorption [28]. Figure 6a shows the baseline, the 500 thunder for the sound speed of Earth, but without any atmospherically absorption.…”

mentioning

confidence: 99%

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confidence: 99%

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Extraterrestrial sound for planetaria: A pedagogical study

Leighton

Banda

Bergès

et al. 2016

The Journal of the Acoustical Society of America

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“…Titan's thick atmosphere is favorable for the generation and receipt of soundwaves by transducers, and the low temperatures make the attenuation by the principal constituent gases nitrogen and methane relatively low (e.g. Petculescu and Lueptow, 2007;Hanford and Long, 2009). However, photochemistry in the upper atmosphere generates a wide range of complex organic molecules (some of which make up Titan's hydrocarbon seas, and perhaps also its fields of giant sand dunes).…”

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confidence: 99%

Silence on Shangri-La: Attenuation of Huygens acoustic signals suggests surface volatiles

Lorenz

Leese

Hathi

et al. 2014

Planetary and Space Science

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a b s t r a c tObjective: Characterize and understand acoustic instrument performance on the surface of Titan. Methods: The Huygens probe measured the speed of sound in Titan's atmosphere with a 1 MHz pulse time-of-flight transducer pair near the bottom of the vehicle. We examine the fraction of pulses correctly received as a function of time.Results: This system returned good data from about 11 km altitude, where the atmosphere became thick enough to effectively transmit the sound, down to the surface just before landing: these data have been analyzed previously. After an initial transient at landing, the instrument operated nominally for about 10 min, recording pulses much as during descent. The fraction of pulses detected then declined and the transmitted sound ceased to be detected altogether, despite no indication of instrument or probe configuration changes. Conclusions: The most likely explanation appears to be absorption of the signal by polyatomic gases with relaxation losses at the instrument frequency, such as ethane, acetylene and carbon dioxide. These vapors, detected independently by the GCMS instrument, were evolved from the surface material by the warmth leaking from the probe, and confirm the nature of the surface materials as 'damp' with a cocktail of volatile compounds. Some suggestions for future missions are considered. Practice implications: None.

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Lightning detection in planetary atmospheres

Aplin

Fischer

2017

Weather

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Lightning in planetary atmospheres is now a well‐established concept. Here we discuss the available detection techniques for, and observations of, planetary lightning by spacecraft, planetary landers and, increasingly, sophisticated terrestrial radio telescopes. Future space missions carrying lightning‐related instrumentation are also summarised, specifically the European ExoMars mission and Japanese Akatsuki mission to Venus, which could both yield lightning observations in 2016.

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Atmospheric acoustics of Titan, Mars, Venus, and Earth

Cited by 49 publications

References 20 publications

Extraterrestrial sound for planetaria: A pedagogical study

Extraterrestrial sound for planetaria: A pedagogical study

Silence on Shangri-La: Attenuation of Huygens acoustic signals suggests surface volatiles

Lightning detection in planetary atmospheres

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