Results 261 to 270 of about 13,506 (288)

Viewing the outer heliosphere in energetic neutral atoms

Advances in Space Research, 1993
The use of energetic neutral atoms (ENAs) to study the outer heliosphere is discussed. The detection of ENAs under stringent observational conditions is addressed. Imaging ENA instruments are examined.
K.C. Hsieh, M.A. Gruntman
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Imaging a geomagnetic storm with energetic neutral atoms

Journal of Atmospheric and Solar-Terrestrial Physics, 2000
Abstract The ring current during a geomagnetic storm on May 2, 1986 has been modeled using a bounce averaged kinetic equations for the phase space density of hydrogen ions, considering charge exchange and Coulomb losses along the drift path. The resulting equatorial pitch angle distribution is used to generate data simulating the medium and high ...
J.D. Perez, M.-C. Fok, T.E. Moore
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Anisotropy of the energetic neutral atom flux in the heliosphere

Planetary and Space Science, 1992
Characteristics of the energetic neutral atoms born at the heliospheric interface are considered for plasma flow structure resulting from a two-shock model of the interaction between the solar wind and the interstellar medium. The energy distributions of heliospheric energetic neutral atoms (HELENAs) are calculated and it is shown that the HELENA flux ...
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Energetic neutral atoms at Mars 3. Flux and energy distributions of planetary energetic H atoms

Journal of Geophysical Research: Space Physics, 2002
The energetic neutral atom (ENA) distribution around Mars is characterized by ENAs which have their origin in the solar wind (HSWENA) and by a second particle population which comes from the planetary atmosphere (HplENA). Since planetary energetic neutral hydrogen atoms contain information about the Martian water inventory, we calculated their flux and
H. Lichtenegger, H. Lammer, W. Stumptner
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Energetic neutral atom imaging of space plasmas

Review of Scientific Instruments, 1997
Experimental techniques and instrumentation for space plasma imaging in fluxes of energetic neutral atoms (ENAs) are reviewed. ENAs are born in charge exchange collisions between space plasma energetic ions and background neutral gas. ENAs are ubiquitous in the space environment and their energies are in the range from a few eV up to >100 keV ...
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Observations of energetic neutral atoms and their implications on modeling the heliosheath

AIP Conference Proceedings, 2006
Energetic hydrogen and helium atoms have been identified and their fluxes monitored by the High‐Energy Suprathermal Time‐of‐Flight sensor (HSTOF) of the Charge, Element, and Isotope Analysis System (CELIAS) on the Solar and Heliospheric Observatory (SOHO) near the Lagrangian point L1 since 1996.
Hilchenbach, M., Czechowski, A., Hsieh, K., Kallenbach, R.   +3 more
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Ionization of Energetic Neutral Atoms on a Metallic Surface

Journal of the Physical Society of Japan, 1973
Experimental study is described of the ionization of energetic neutral atoms on an untreated, metallic surface. The energy loss associated with the ionization is found to depend strongly on the incident angle of the particles onto the surface. The efficiency of ionization is of the order of 10 -6 .
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A new collimator design for energetic neutral atom instruments

Review of Scientific Instruments, 1994
A new type of collimator design is described for energetic neutral atom instruments for space research applications. The collimator consists of annular entrance and exit slits with charged particle deflection plates between them. This configuration allows one to meet three seemingly contradicting requirements of compact design, efficient rejection of ...
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Satellite observations and instrumentation for measuring energetic neutral atoms

Optical Engineering, 1993
Direct measurements of energetic neutral atoms (ENA) and ions have been obtained with the cooled solid state detectors on the low-altitude (220 km) three-axis stabilized S81-1/ stimulated emissions of energetic particles (SEEP) satellite and on the spinning 400 km x 5.5 Re (where Re is Earth radii) Combined Release and Radiation Effects Satellite ...
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Lunar Atmosphere, Energetic Neutral Atoms

2019
A. Vorburger, P. Wurz
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