Jupiter’s Mesoscale Waves Observed at 5 μm by Ground-based Observations and Juno JIRAM

Fletcher, Leigh N.; Melin, Henrik; Adriani, A.; Simon-Miller, A. A.; Sánchez‐Lavega, A.; Donnelly, Padraig T.; Antuñano, Arrate; Orton, Glenn S.; Hueso, R.; Kraaikamp, E.; Wong, Michael H.; Barnett, Megan; Moriconi, M. L.; Altieri, F.; Sindoni, G.

doi:10.3847/1538-3881/aace02

Cited by 20 publications

(33 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the eastern region, a wavenumber of 0.65 (∼1900 km) prevails, while in the westward region, a contribution from 0.89 (∼1400 km) wavenumber appears. This westward value is in good agreement with that found in Simon et al (2018) and Fletcher et al (2018).…”

Section: Profile Extraction and Signal Processing From Pj7 Datasupporting

confidence: 91%

“…Whereas for SPE we have, respectively, 238 K (0.15 W m −2 /sr) and 220 K (0.05 W m −2 /sr). The intensity of the observed variations is slightly lower in comparison with those found in the wave patterns studied by Fletcher et al (2018), of the order of 10%.…”

Section: Spectral Data Analysiscontrasting

confidence: 60%

“…Jupiter InfraRed Auroral Mapper (JIRAM) observed wavy cloud features along the NEB by its M-band (5 μm) imager (hereafter IMG-M) on more than one occasion (Fletcher et al 2018). Visually, the acquired images show the crests occurring every 1°-2°longitude degrees.…”

Section: Introductionmentioning

confidence: 99%

“…Similar patterns also have been observed during the Juno mission by Hubble Space Telescope's WFC3, NIRI (Gemini North Telescope) and The Very Large Telescope VISIR, the latter with a new capability allowing it to provide improved 5 μm diffraction-limited images. The non-Juno results are reported in two companion papers (Fletcher et al 2018;Simon et al 2018). The JIRAM working range, both in the imager and in the spectroscopic channels, covers the 2-5 μm spectral region, therefore allowing it to sound levels deeper than the 1-bar pressure level, with a spatial detail that can reach a few tenths of a kilometer.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization of Mesoscale Waves in the Jupiter NEB by Jupiter InfraRed Auroral Mapper on board Juno

Adriani

Moriconi

Altieri

et al. 2018

Self Cite

View full text Add to dashboard Cite

In 2017, the Jupiter InfraRed Auroral Mapper (JIRAM), on board the NASA-ASI Juno mission, observed a wide longitude region (50°W-80°E in System III) that was perturbed by a wave pattern centered at 15°N in the Jupiter's North Equatorial Belt (NEB). We analyzed JIRAM data acquired on 2017 July 10 using the M-channel and on 2017 February 2 with the spectrometer. The two observations occurred at different times and at slightly different latitudes. The waves appear as clouds blocking the deeper thermal emission. The wave crests are oriented north-south, and the typical wave packet contains 10 crests and 10 troughs. We used Fourier analysis to rigorously determine the wavenumbers associated with the observed patterns at a confidence level of 90%. Wavelet analysis was also used to constrain the spatial localization of the largest energies involved in the process and determine the wavelengths carrying the major contribution. We found wavelengths ranging from 1400 to 1900 km, and generally decreasing toward the west. Where possible, we also computed a vertical location of the cloud pressure levels from the inversion of the spectral radiances measured by the JIRAM spectrometer. The waves were detected at pressure levels consistent with the NH 3 as well as NH 4 SH clouds. Phase velocities could not be determined with sufficient confidence to discriminate whether the alternating crests and troughs are a propagating wave or a manifestation of a fluid dynamical instability.

show abstract

Section: Profile Extraction and Signal Processing From Pj7 Datasupporting

confidence: 91%

Section: Spectral Data Analysiscontrasting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of Mesoscale Waves in the Jupiter NEB by Jupiter InfraRed Auroral Mapper on board Juno

Adriani

Moriconi

Altieri

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the first year of the Juno observations, Jupiter's NEB underwent a periodic expansion event (Fletcher et al, ), which coincided with a period of extensive NEB wave activity in the upper troposphere. In this paper, we use the 1.58–2.28 μm observations of Jupiter made by NIRI to study these waves.…”

Section: Introductionmentioning

confidence: 99%

Wave Activity in Jupiter's North Equatorial Belt From Near‐Infrared Reflectivity Observations

Giles

Orton

Stephens

et al. 2019

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

High spatial resolution images of Jupiter at 1.58–2.28 μm are used to track and characterize a wave pattern observed in 2017 at a planetocentric latitude of 14°N. The wave pattern has a wave number of 18 and spans ∼5° in latitude. One bright crest remains stationary in System III longitude, while the remaining crests move slowly westward. The bright and dark regions of the near‐infrared wave pattern are caused by variations in the vertical location of the upper tropospheric haze layer. A comparison with thermal infrared observations shows a correlation with temperature anomalies in the upper troposphere. The results are consistent with a Rossby wave, generated by flow around a stationary vortex.

show abstract

A Survey of Small-Scale Waves and Wave-Like Phenomena in Jupiter's Atmosphere Detected by JunoCam

Orton

Tabataba‐Vakili

Eichstädt

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

In the first 20 orbits of the Juno spacecraft around Jupiter, we have identified a variety of wave-like features in images made by its public-outreach camera, JunoCam. Because of Juno's unprecedented and repeated proximity to Jupiter's cloud tops during its close approaches, JunoCam has detected more wave structures than any previous surveys. Most of the waves appear in long wave packets, oriented east-west and populated by narrow wave crests. Spacing between crests were measured as small as 30 km, shorter than any previously measured. Some waves are associated with atmospheric features, but others are not ostensibly associated with any visible cloud phenomena and thus may be generated by dynamical forcing below the visible cloud tops. Some waves also appear to be converging, and others appear to be overlapping, possibly at different atmospheric levels. Another type of wave has a series of fronts that appear to be radiating outward from the center of a cyclone. Most of these waves appear within 5°of latitude from the equator, but we have detected waves covering planetocentric latitudes between 20°S and 45°N. The great majority of the waves appear in regions associated with prograde motions of the mean zonal flow. Juno was unable to measure the velocity of wave features to diagnose the wave types due to its close and rapid flybys. However, both by our own upper limits on wave motions and by analogy with previous measurements, we expect that the waves JunoCam detected near the equator are inertia-gravity waves.Plain Language Summary JunoCam, the visible camera on the Juno spacecraft orbiting Jupiter, has detected hundreds of small-scale waves and wave-like features, some as small as 30 km, shorter than ever measured before. Some waves appear near larger features, which may be associated with their origin, but others must be the result of winds hidden beneath the clouds. Most of the waves appear like long trains of narrow, parallel lines, but there is a wide variety of other types of wave-like features. Some waves converge on each other or cross over each other, and some wavefronts appear to radiate outward from a hurricane-like storm. Although waves are found over a wide range of latitudes from 20°S to 45°N, the overwhelming majority are found in a narrow band between 5°S and 5°N. The vast majority of these features are found at latitudes with strong prevailing eastward winds, heading in the same direction as Jupiter's rotation. The lack of motion associated with waves at the equator and their similarity to waves measured over even longer time spans by previous spacecraft imply that they are like ripples in a pond but in a rotating fluid, a phenomenon known as inertia-gravity waves.

show abstract

Jupiter’s Mesoscale Waves Observed at 5 μm by Ground-based Observations and Juno JIRAM

Cited by 20 publications

References 31 publications

Characterization of Mesoscale Waves in the Jupiter NEB by Jupiter InfraRed Auroral Mapper on board Juno

Characterization of Mesoscale Waves in the Jupiter NEB by Jupiter InfraRed Auroral Mapper on board Juno

Wave Activity in Jupiter's North Equatorial Belt From Near‐Infrared Reflectivity Observations

A Survey of Small-Scale Waves and Wave-Like Phenomena in Jupiter's Atmosphere Detected by JunoCam

Contact Info

Product

Resources

About