MWR: Microwave Radiometer for the Juno Mission to Jupiter

Janssen, M. A.; Oswald, J.; Brown, Shannon; Gulkis, S.; Levin, S. M.; Bolton, S. J.; Allison, M.; Atreya, S. K.; Gautier, D.; Ingersoll, Andrew P.; Lunine, Jonathan I.; Orton, Glenn S.; Owen, Tobias; Steffes, Paul G.; Adumitroaie, Virgil; Bellotti, Amadeo; Jewell, L. A.; Li, C.; Li, Liming; Misra, Sidharth; Oyafuso, Fabiano; Santos-Costa, Daniel; Sarkissian, E.; Williamson, R.; Arballo, J. K.; Kitiyakara, A.; Ulloa-Severino, Antonio; Chen, J. C.; Maiwald, Frank; Sahakian, A. S.; Pingree, Paula J.; Lee, K. A.; Mazer, Alan S.; Redick, Richard W.; Hodges, Richard E.; Hughes, R.C.; Bedrosian, G.; Dawson, Douglas E.; Hatch, W. A.; Russell, Damon; Chamberlain, Neil; Zawadski, M. S.; Khayatian, B.; Franklin, B. R.; Conley, Henry A.; Kempenaar, J. G.; Loo, M. S.; Sunada, Eric; Vorperion, V.; Wang, C. C.

doi:10.1007/s11214-017-0349-5

Cited by 76 publications

(102 citation statements)

References 65 publications

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“…Excluding the synchrotron radio emissions from Jupiter's inner magnetosphere which will be measured with the Microwave Radiometer (MWR) instrument on Juno (Janssen et al 2017), Jupiter's radio spectrum (see Fig. 2) extends from a few kHz to approximately 40 MHz ) comprising a small zoo of different phenomena shown in Fig.…”

Section: Auroral Radio Emissionsmentioning

confidence: 99%

The Juno Waves Investigation

et al. 2017

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Jupiter is the source of the strongest planetary radio emissions in the solar system. Variations in these emissions are symptomatic of the dynamics of Jupiter's magnetosphere and some have been directly associated with Jupiter's auroras. The strongest radio emissions are associated with Io's interaction with Jupiter's magnetic field. In addition, plasma waves are thought to play important roles in the acceleration of energetic particles in the magnetosphere, some of which impact Jupiter's upper atmosphere generating the auroras. Since the exploration of Jupiter's polar magnetosphere is a major objective of the Juno mission, it is appropriate that a radio and plasma wave investigation is included in Juno's payload. This paper describes the Waves instrument and the science it is to pursue as part of the Juno mission.

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Section: Auroral Radio Emissionsmentioning

confidence: 99%

The Juno Waves Investigation

et al. 2017

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“…The Juno Microwave Radiometer (MWR) is a multifrequency scientific instrument primarily designed and built to investigate the deep atmosphere of Jupiter [Janssen et al, 2017]. The entire MWR instrument consists of six individual radiometer channels.…”

Section: Observation Backgroundmentioning

confidence: 99%

“…During the science orbits, within two planetary radii (R J ) from Jupiter, MWR samples at high resolution the atmospheric thermal radiation from depths extending from the ammonia cloud region at around 1 bar to pressure levels beyond 1000 bars [Janssen et al, 2017]. With each spin of the spacecraft, the instrument also measures the synchrotron emission at each of six frequencies, over a wide range of angles, from unique vantage points inside and outside the radiation belt.…”

Section: Observation Backgroundmentioning

confidence: 99%

“…The simulations use a time series of 4 brightness maps computed as outlined in section 2.3. Only antenna temperatures for the synchrotron radiation are numerically computed using modeling tools developed at the Jet Propulsion Laboratory [Janssen et al, 2017]. Our first results are for total emission, not the polarized components, while model improvements and results on polarization will be the topics of a follow-up paper.…”

Section: Preliminary Data Analysis and Model Comparisonsmentioning

confidence: 99%

“…Since late August 2016, measurements of Jupiter's microwave radiation have been taken at high data rates with the Microwave Radiometer (MWR) instrument [Janssen et al, 2017] during Juno's passes at the planet. The synchrotron emission had never been observed with high resolution for +90 to −90 ∘ latitude or modeled from a location so close to the planet from inside/outside the electron belt region.…”

Section: Introductionmentioning

confidence: 99%

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First look at Jupiter's synchrotron emission from Juno's perspective

Santos-Costa

Adumitroaie

Ingersoll

et al. 2017

Geophysical Research Letters

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Since August 2016, measurements of Jupiter's microwave emissions at six wavelengths ranging from 1.3 cm to 50 cm have been made with the Juno Microwave Radiometer. In this paper, we introduce the first systematic set of in situ observations of synchrotron radiation in a polar plane while describing the modeling approach we use to analyze this data (collected 27 August 2016). Time series of brightness profiles at all six frequencies present similarities that are explained by the presence of known regions of intense synchrotron radiation. Our model predictions, though limited for now to the total intensity of the radiation, reproduce (qualitatively) the observation of temporal variations and allow to disentangle the synchrotron emission from the atmospheric emission. The discrepancies seen between the data and simulations confirm that physical conditions close to Jupiter affecting synchrotron emission (electron energy spectra, pitch angle distributions, and the magnetic environment) are different than we anticipated.

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Multiple‐wavelength sensing of Jupiter during the Juno mission's first perijove passage

Orton

Momary

Ingersoll

et al. 2017

Geophysical Research Letters

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We compare Jupiter observations made around 27 August 2016 by Juno's JunoCam, Jovian Infrared Auroral Mapper (JIRAM), MicroWave Radiometer (MWR) instruments, and NASA's Infrared Telescope Facility. Visibly dark regions are highly correlated with bright areas at 5 µm, a wavelength sensitive to gaseous NH3 gas and particulate opacity at p ≤5 bars. A general correlation between 5‐µm and microwave radiances arises from a similar dependence on NH3 opacity. Significant exceptions are present and probably arise from additional particulate opacity at 5 µm. JIRAM spectroscopy and the MWR derive consistent 5‐bar NH3 abundances that are within the lower bounds of Galileo measurement uncertainties. Vigorous upward vertical transport near the equator is likely responsible for high NH3 abundances and with enhanced abundances of some disequilibrium species used as indirect indicators of vertical motions.

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MWR: Microwave Radiometer for the Juno Mission to Jupiter

Cited by 76 publications

References 65 publications

The Juno Waves Investigation

The Juno Waves Investigation

First look at Jupiter's synchrotron emission from Juno's perspective

Multiple‐wavelength sensing of Jupiter during the Juno mission's first perijove passage

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