Energetic neutral atom imaging of space plasmas

Gruntman, M.

doi:10.1063/1.1148389

Cited by 172 publications

(98 citation statements)

References 368 publications

(518 reference statements)

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“…[60] The required energy-dependent charge exchange cross sections, i.e., protons with neutral hydrogen and neutral oxygen, are taken from Barnett [1990], Gruntman [1997], and Lindsay and Stebbings [2005]. Since ion distributions are deconvolved for one energy or energy-range at a time, the charge exchange cross section appears as a multiplicative factor.…”

Section: A2 Physicsmentioning

confidence: 99%

Evolution of CIR storm on 22 July 2009

et al. 2012

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[1] Global images of ion intensities are deconvolved from TWINS ENA images during the main and recovery phase of a CIR storm on 22 July 2009. The global spatial ion images taken at different times, along with solar wind data, geomagnetic activity indices, geosynchronous orbit observations, and in situ measurements from the THEMIS mission provide a picture of the evolution of the ring current during both the main phase and early recovery phase of the storm. Major features of the evolution are consistent with expectations based upon time dependent geomagnetic indices, e.g., SYM/H and ASY/H, and geosynchronous orbit detection of dipolarizations from GOES 11 and 12. Direct comparisons are made with in situ THEMIS ESA and SST spectral measurements. The peak energy of the ion spectrum in the ring current is seen to decrease in the recovery phase. The time evolution of the ion energy spectra over the range from 2.5 to 97.5 keV at the spatial peaks of the ring current in the inner magnetosphere obtained from ENA images is presented for the first time.

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Section: A2 Physicsmentioning

confidence: 99%

Evolution of CIR storm on 22 July 2009

et al. 2012

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“…It was understood in the early 1960s that the processes at the solar wind termination region would produce ENAs (see review by Gruntman [ 1997]). The emerging concept of the heliosphere [Davis, 1955;Parker, 1963] [Fahr, 1974;Holzer, 1977;Meier, 1977;Thomas, 1978;Bertaux, 1984].…”

Section: Heliospheric Energetic Neutral Atomsmentioning

confidence: 99%

Energetic neutral atom imaging of the heliospheric boundary region

Gruntman¹,

Roelof²,

Mitchell³

et al. 2001

J. Geophys. Res.

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129

124

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Abstract. Energetic neutral atom (ENA) imaging is a powerful technique, which can remotely probe the properties of distant hot plasmas. Hot plasmas are abundant at the heliospheric boundary, the region where the expanding solar wind meets the surrounding local interstellar cloud. Here we present a new concept for imaging this boundary in ENA fluxes. Heliospheric ENAs are born from charge exchange between energetic protons and the background interstellar atomic hydrogen gas. The technique is ideal for studying the asymmetric threedimensional heliospheric interface region remotely, from 1 AU. We show that ENA imaging in the 0.2-6 keV energy range will establish the nature of the telTnination shock and properties of hot proton populations in the heliosheath. We also examine how the evolution of pickup proton populations at and beyond the shock can be explored. Global heliosphere ENA images will distinguish among the competing models of the interaction between the Sun and the local interstellar medium, and they will reveal the physics of important processes in the interface region. Heliospheric ENA fluxes are exceptionally weak, which makes imaging implementation difficult. Nonetheless, we show how single-pixel ENA sensors can image the heliosphere from a spicming spacecraft on a typical mission near 1 AU. The required instrumentation is briefly discussed. HeliosphereThe interaction of the expanding solar wind plasma and local interstellar medium (

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“…Schematic showing the mechanism of pinhole imaging. Because no lens is used, the final image will be upside down relative to the imaged object (Gruntman 1997). Pajarito Scientific Corporation supplied the pinhole-imaging device, RadScan™, used at ORNL. It consists of a sodium iodide scintillation detector positioned behind a tungsten collimator.…”

Section: Pinhole Imagingmentioning

confidence: 99%