Galileo plasma observations at Europa: Ion energy spectra and moments

Paterson, W. R.; Frank, L. A.; Ackerson, K. L.

doi:10.1029/1999ja900191

Cited by 56 publications

(105 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results for this fitting procedure can also be found in Table 4, where we show y off and assuming a charge-per-ion, Z=1.5 (Bagenal, 1994) we give the value for the ion mass-per-charge A/Z. As a comparison we show the only published PLS plasma density data near Europa (Paterson et al, 1999) for the E4 and E6 flyby. (10) and (13) for E17 (left), E25A (middle) and E26.…”

Section: Fitting the Alfvén Wing Ellipsementioning

confidence: 91%

See 1 more Smart Citation

Europa's Alfvén wing: shrinkage and displacement influenced by an induced magnetic field

2007

View full text Add to dashboard Cite

Abstract. The Galileo magnetometer data are used to investigate the structure of the Alfvén wing during three flybys of Europa. The presence of an induced magnetic field is shown to shrink the cross section of the Alfvén wing and offset it along the direction radial to Jupiter. Both the shrinkage and the offset depend on the strength of the induced field. The entry and exit points of the spacecraft into and out of the Alfvén wings are modeled to determine the angle between the wings and the background magnetic field. Tracing of the Alfvén characteristics in a model magnetic field consisting of Jupiter's background field and an induced field in Europa produces an offset and shrinking of the Alfvén wing consistent with the geometric modeling. Thus we believe that the Alfvén wing properties have been determined correctly. The Alfvén wing angle is directly proportional to the local Alfvén velocity, and is thus a probe for the local plasma density. We show that the inferred plasma density can be understood in terms of the electron density measured by the plasma wave experiment. When Europa is located in the Jovian plasma sheet the derived mass-per-charge exceeds the previous estimates, which is a result of increased pickup of sputtered ions near the moon. The estimated rate of O + 2 pickup agrees well with the results from numerical models.

show abstract

Section: Fitting the Alfvén Wing Ellipsementioning

confidence: 91%

“…Nomimal values for the plasma near Europa are: average ion mass A =18.5 AMU/ion, average ion charge Z=1.5, (Bagenal, 1994;Kivelson et al, 2004). The PLS ion densities for E4 and E6 have been taken from Paterson et al (1999). 20,14) occurred at very low altitude (348.4 km, see Table 1), close to Europa's ionosphere.…”

Section: E26mentioning

confidence: 99%

Europa's Alfvén wing: shrinkage and displacement influenced by an induced magnetic field

2007

View full text Add to dashboard Cite

show abstract

“…II B, both CoDICE-Lo and -Hi can use triple coincidence signals (Start, Stop, and E) to suppress background. In penetrating radiation environments such as Jupiter's magnetosphere, [13][14][15][16][17] the plasma ion azimuth obtained from the identities of the APD, and the Lo-Start discrete anode can be used for additional signal validation. Likewise, the outer circular anode of the Stop MCP can be replaced by 12-discrete anodes to obtain an EI's azimuth, which when combined with the SSD location can also provide further signal validation.…”

Section: B Design Advantages and Space Applicationsmentioning

confidence: 99%

“…V B, we discuss the potential advantages and applications of a CoDICE-type instrument, with emphasis on composition measurements of ion populations in penetrating radiation environments, e.g., Jupiter's magnetosphere. [13][14][15][16][17] …”

Section: Introductionmentioning

confidence: 99%

An integrated time-of-flight versus residual energy subsystem for a compact dual ion composition experiment for space plasmas

Desai

Ogasawara

Ebert

et al. 2015

Review of Scientific Instruments

View full text Add to dashboard Cite

We have developed a novel concept for a Compact Dual Ion Composition Experiment (CoDICE) that simultaneously provides high quality plasma and energetic ion composition measurements over 6 decades in ion energy in a wide variety of space plasma environments. CoDICE measures the two critical ion populations in space plasmas: (1) mass and ionic charge state composition and 3D velocity and angular distributions of ∼10 eV/q–40 keV/q plasma ions—CoDICE-Lo and (2) mass composition, energy spectra, and angular distributions of ∼30 keV–10 MeV energetic ions—CoDICE-Hi. CoDICE uses a common, integrated Time-of-Flight (TOF) versus residual energy (E) subsystem for measuring the two distinct ion populations. This paper describes the CoDICE design concept, and presents results of the laboratory tests of the TOF portion of the TOF vs. E subsystem, focusing specifically on (1) investigation of spill-over and contamination rates on the start and stop microchannel plate (MCP) anodes vs. secondary electron steering and focusing voltages, scanned around their corresponding model-optimized values, (2) TOF measurements and resolution and angular resolution, and (3) cross-contamination of the start and stop MCPs’ singles rates from CoDICE-Lo and -Hi, and (4) energy resolution of avalanche photodiodes near the lower end of the CoDICE-Lo energy range. We also discuss physical effects that could impact the performance of the TOF vs. E subsystem in a flight instrument. Finally, we discuss advantages of the CoDICE design concept by comparing with capabilities and resources of existing flight instruments.

show abstract

“…It may be possible to detect these waves using the ARTEMIS vector magnetic field data. Waves from pickup ions have been identified in the plasma environments of many solar system bodies, including Venus, Mars, and even the moons of the giant planets (Russell et al 1990;Kivelson et al 1996;Paterson et al 1999;Grebowsky et al 2004;Dougherty et al 2006;Russell and Blanco-Cano 2007;Delva et al 2008), and their presence or absence can be used to constrain the local density of pickup ions, and therefore the source strength.…”

Section: Exospheric Ions and Plasma Pick-upmentioning

confidence: 99%

ARTEMIS Science Objectives

Sibeck

Angelopoulos²,

Brain

et al. 2011

Space Sci Rev

View full text Add to dashboard Cite

NASA's two spacecraft ARTEMIS mission will address both heliospheric and planetary research questions, first while in orbit about the Earth with the Moon and subsequently while in orbit about the Moon. Heliospheric topics include the structure of the Earth's magnetotail; reconnection, particle acceleration, and turbulence in the Earth's magnetosphere, at the bow shock, and in the solar wind; and the formation and structure of the D.G. Sibeck ( ) Code 674, GSFC/NASA,

show abstract

Galileo plasma observations at Europa: Ion energy spectra and moments

Cited by 56 publications

References 17 publications

Europa's Alfvén wing: shrinkage and displacement influenced by an induced magnetic field

Europa's Alfvén wing: shrinkage and displacement influenced by an induced magnetic field

An integrated time-of-flight versus residual energy subsystem for a compact dual ion composition experiment for space plasmas

ARTEMIS Science Objectives

Contact Info

Product

Resources

About