The Jupiter Energetic Particle Detector Instrument (JEDI) Investigation for the Juno Mission

Mauk, B. H.; Haggerty, D. K.; Jaskulek, S.; Schlemm, C. E.; Brown, L. E.; Cooper, S. A.; Gurnee, R. S.; Hammock, C. M.; Hayes, J. R.; Ho, G. C.; Hutcheson, Joel C.; Jacques, A. D.; Kerem, S.; Kim, C. K.; Mitchell, D. G.; Nelson, K. S.; Paranicas, C.; Paschalidis, N.; Rossano, E.; Stokes, Mark

doi:10.1007/s11214-013-0025-3

Cited by 184 publications

(254 citation statements)

References 22 publications

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“…Juno is equipped with instruments to make in situ measurements of the ions and electrons (JADE; McComas et al, 2013b), energetic particles (JEDI; Mauk et al, 2014), magnetic fields (MAG; Connerney et al, in preparation) and plasma waves (Waves; Kurth et al, in preparation) in Jupiter's magnetosphere. These instruments are expected to directly measure these properties in the solar wind and magnetosheath during Juno's approach to Jupiter and capture orbit.…”

Section: Discussionmentioning

confidence: 99%

A survey of solar wind conditions at 5 AU: a tool for interpreting solar wind-magnetosphere interactions at Jupiter

Ebert

Bagenal

McComas

et al. 2014

Front. Astron. Space Sci.

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We examine Ulysses solar wind and interplanetary magnetic field (IMF) observations at 5 AU for two ∼13 month intervals during the rising and declining phases of solar cycle 23 and the predicted response of the Jovian magnetosphere during these times. The declining phase solar wind, composed primarily of corotating interaction regions and high-speed streams, was, on average, faster, hotter, less dense, and more Alfvénic relative to the rising phase solar wind, composed mainly of slow wind and interplanetary coronal mass ejections. Interestingly, none of solar wind and IMF distributions reported here were bimodal, a feature used to explain the bimodal distribution of bow shock and magnetopause standoff distances observed at Jupiter. Instead, many of these distributions had extended, non-Gaussian tails that resulted in large standard deviations and much larger mean over median values. The distribution of predicted Jupiter bow shock and magnetopause standoff distances during these intervals were also not bimodal, the mean/median values being larger during the declining phase by ∼1-4%. These results provide data-derived solar wind and IMF boundary conditions at 5 AU for models aimed at studying solar wind-magnetosphere interactions at Jupiter and can support the science investigations of upcoming Jupiter system missions. Here, we provide expectations for Juno, which is scheduled to arrive at Jupiter in July 2016. Accounting for the long-term decline in solar wind dynamic pressure reported by McComas et al. (2013a), Jupiter's bow shock and magnetopause is expected to be at least 8-12% further from Jupiter, if these trends continue.

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Section: Discussionmentioning

confidence: 99%

A survey of solar wind conditions at 5 AU: a tool for interpreting solar wind-magnetosphere interactions at Jupiter

Ebert

Bagenal

McComas

et al. 2014

Front. Astron. Space Sci.

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“…Thus Juno will also conduct an intensive study of the Jovian aurorae and polar magnetosphere, acquiring an impressive set of in-situ and remote observations as it transits the polar region. Juno's instrument complement thus also includes a suite of fields and particle instruments for in-situ sampling; in addition to the magnetometer, Juno carries an energetic particle detector (JEDI) measuring electrons in the energy range 40-500 keV and ions from 20 keV to >1 MeV (Mauk et al 2013), a Jovian auroral (plasma) distributions experiment (JADE) measuring electrons with energies of 0.1 to 100 keV and ions from 5 to 50 keV (McComas et al 2013), and a radio and plasma waves instrument (WAVES) recording Jovian radio emissions to >40 MHz (Kurth et al, this issue). Remote observations of the aurora will be acquired by an ultraviolet spectrometer (UVS) counting individual UV photons (Gladstone et al, 2014) and a Jupiter infrared auroral mapping instrument (JIRAM) supporting imagery and spectrometry .…”

Section: Introductionmentioning

confidence: 99%

The Juno Magnetic Field Investigation

et al. 2017

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The Juno Magnetic Field investigation (MAG) characterizes Jupiter's planetary magnetic field and magnetosphere, providing the first globally distributed and proximate measurements of the magnetic field of Jupiter. The magnetic field instrumentation consists of two independent magnetometer sensor suites, each consisting of a tri-axial Fluxgate Magnetometer (FGM) sensor and a pair of co-located imaging sensors mounted on an ultra-stable optical bench. The imaging system sensors are part of a subsystem that provides accurate attitude information (to ∼20 arcsec on a spinning spacecraft) near the point of measurement of the magnetic field. The two sensor suites are accommodated at 10 and 12 m from the body of the spacecraft on a 4 m long magnetometer boom affixed to the outer end of one of 's three solar array assemblies. The magnetometer sensors are controlled by independent and functionally identical electronics boards within the magnetometer electronics package mounted inside Juno's massive radiation shielded vault. The imaging sensors are controlled by a fully hardware redundant electronics package also mounted within the radiation vault. Each magnetometer sensor measures the vector magnetic field with 100 ppm absolute vector accuracy over a wide dynamic range (to 16 Gauss = 1.6 × 10 6 nT per axis) with a resolution of ∼0.05 nT in the most sensitive dynamic range (±1600 nT per axis). Both magnetometers sample the magnetic field simultaneously at an intrinsic sample rate of 64 vector samples per second. The magnetic field instrumentation may be reconfigured in flight to meet unanticipated needs and is fully hardware redundant. The attitude determination system compares images with an on-board star catalog to provide attitude solutions (quaternions) at a rate of up to 4 solutions per second, and may be configured to acquire images of selected targets for science and engineering analysis. The system tracks and catalogs objects that pass through the imager field of view and also provides a continuous record of radiation exposure. A spacecraft magnetic control program was implemented to provide a magnetically clean environment for the magnetic sensors, and residual spacecraft fields and/or sensor offsets are monitored in flight taking advantage of Juno's spin (nominally 2 rpm) to separate environmental fields from those that rotate with the spacecraft.

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“…Juno's magnetometer investigation (MAG) consists of a pair of vector fluxgate magnetometers and proximate star cameras for accurate mapping of the planetary magnetic field [3]. The Jupiter Energetic Particle Detector Instrument (JEDI) measures electrons in the energy range 30 -800 keV and ions from 10 keV to >1MeV [4] whilst the Jovian Auroral Distributions Experiment (JADE) measures electrons with energies of 0.1 to 100 keV and ions from 5 to 50 keV [5]. Jovian radio and plasma waves are recorded with the Plasma Waves Instrument (Waves) which covers the spectrum from 50 Hz to >40 MHz (supplementary materials).…”

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confidence: 99%

Jupiter’s magnetosphere and aurorae observed by the Juno spacecraft during its first polar orbits

Connerney

Adriani

Allegrini

et al. 2017

Science

123

151

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Published in: ScienceLink to article, DOI: 10.1126/science.aam5928 Publication date: 2017 Document VersionPeer reviewed version Link back to DTU Orbit Citation (APA): Connerney, J. E. P., Adriani, A., Allegrini, F., Bagenal, F., Bolton, S. J., Bonfond, B., ... Waite, J. (2017). Jupiter's magnetosphere and aurorae observed by the Juno spacecraft during its first polar orbits. Science, 356(6340) Abstract:The Juno spacecraft acquired direct observations of the Jovian magnetosphere and auroral emissions from a vantage point above the poles. Juno's capture orbit spanned the Jovian magnetosphere from bow shock to the planet, providing magnetic field, charged particle, and wave phenomena context for Juno's passage over the poles and traverse of Jupiter's hazardous inner radiation belts. Juno's energetic particle and plasma detectors measured electrons precipitating in the polar regions, exciting intense aurorae, observed simultaneously by the ultraviolet and infrared imaging spectrographs. Juno transited beneath the most intense parts of the radiation belts, passed ~4,000 kilometers above the cloudtops at closest approach, well inside the Jovian rings, and recorded the electrical signatures of high velocity impacts with small particles as it traversed the equator.One Sentence Summary: Juno's instruments provide complete polar maps of Jovian UV aurorae, spatially resolved images of the IR southern aurorae, and in-situ direct measurements of precipitating charged particle populations exciting the aurora. only one bow shock upon approach suggests that the magnetosphere was expanding in size, a conclusion bolstered by the multiple BS encounters experienced outbound during the 53.5 day capture orbit at radial distances of 92-112 Rj before apojove on DOY 213 (~113 Rj), and at distances of 102-108 Rj thereafter . Apojove during the 53.5day orbits occurred at a radial distance of ~113 Rj, so Juno resides at distances of >92 Rj for little more than half of its orbital period (~29 days). Thus on the first two orbits, Juno encountered the MP boundary a great many times at radial distances of ~81-113 Rj.Juno's traverse through the well-ordered portion of the Jovian magnetosphere is illustrated in The magnetic field observed in the previously unexplored region close to the planet (radius<1.3Rj) was dramatically different from that predicted by existing spherical harmonic models, revealing a planetary magnetic field rich in spatial variation, possibly due to a relatively large dynamo radius [1]. Perhaps the most perplexing observation was one that was missing: the expected magnetic signature of intense field aligned currents (Birkeland currents) associated with the main aurora. We did not identify large magnetic perturbations associated with Juno's traverse of field lines rooted in the main auroral oval (supplementary material).Juno's Waves instrument made observations of radio and plasma wave phenomena throughout the first perijove ( Figure 2). These observations were obtained at low altitudes whilst crossing magnetic field lines...

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The Jupiter Energetic Particle Detector Instrument (JEDI) Investigation for the Juno Mission

Cited by 184 publications

References 22 publications

A survey of solar wind conditions at 5 AU: a tool for interpreting solar wind-magnetosphere interactions at Jupiter

A survey of solar wind conditions at 5 AU: a tool for interpreting solar wind-magnetosphere interactions at Jupiter

The Juno Magnetic Field Investigation

Jupiter’s magnetosphere and aurorae observed by the Juno spacecraft during its first polar orbits

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