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Jupiter's Equatorial Plumes and Hot Spots: Spectral Mapping from Gemini/TEXES and Juno/MWR | L.N. Fletcher
; G.S. Orton
; T.K. Greathouse
; J.H. Rogers
; Z. Zhang
; F.A. Oyafuso
; G. Eichstädt
; H. Melin
; C. Li
; S.M. Levin
; S. Bolton
; M. Janssen
; H-J. Mettig
; D. Grassi
; A. Mura
; A. Adriani
; | Date: |
31 Mar 2020 | Abstract: | We present multi-wavelength measurements of the thermal, chemical, and cloud
contrasts associated with the visibly dark formations (also known as 5-$mu$m
hot spots) and intervening bright plumes on the boundary between Jupiter’s
Equatorial Zone (EZ) and North Equatorial Belt (NEB). Observations made by the
TEXES 5-20 $mu$m spectrometer at the Gemini North Telescope in March 2017
reveal the upper-tropospheric properties of 12 hot spots, which are directly
compared to measurements by Juno using the Microwave Radiometer (MWR), JIRAM at
5 $mu$m, and JunoCam visible images. MWR and thermal-infrared spectroscopic
results are consistent near 0.7 bar. Mid-infrared-derived aerosol opacity is
consistent with that inferred from visible-albedo and 5-$mu$m opacity maps.
Aerosol contrasts, the defining characteristics of the cloudy plumes and
aerosol-depleted hot spots, are not a good proxy for microwave brightness. The
hot spots are neither uniformly warmer nor ammonia-depleted compared to their
surroundings at $p<1$ bar. At 0.7 bar, the microwave brightness at the edges of
hot spots is comparable to other features within the NEB. Conversely, hot spots
are brighter at 1.5 bar, signifying either warm temperatures and/or depleted
NH$_3$ at depth. Temperatures and ammonia are spatially variable within the hot
spots, so the precise location of the observations matters to their
interpretation. Reflective plumes sometimes have enhanced NH$_3$, cold
temperatures, and elevated aerosol opacity, but each plume appears different.
Neither plumes nor hot spots had microwave signatures in channels sensing
$p>10$ bars, suggesting that the hot-spot/plume wave is a relatively shallow
feature. | Source: | arXiv, 2004.0072 | Services: | Forum | Review | PDF | Favorites |
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