scholarly journals Energetic neutral atoms at Mars 1. Imaging of solar wind protons

2002 ◽  
Vol 107 (A10) ◽  
Author(s):  
Mats Holmström
Keyword(s):  
Solar Wind ◽  
Neutral Atoms ◽  
Energetic Neutral Atoms

Solar wind interaction with the lunar surface: Observation of energetic neutral atoms on the lunar surface by the Advanced Small Analyzer for Neutrals (ASAN) instrument on the Yutu-2 rover of Chang'E-4.

2020 ◽  
Author(s):  
Martin Wieser ◽  
Stas Barabash ◽  
Xiao-Dong Wang ◽  
Aibing Zhang ◽  
Chi Wang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Solar Wind ◽  
Lunar Surface ◽  
Lunar Regolith ◽  
Remote Sensing Data ◽  
High Porosity ◽  
Neutral Atoms ◽  
Solar Wind Interaction ◽  
Energetic Neutral Atoms ◽  
Nominal Performance

<p>A fraction of up to 20% of the solar wind impinging onto the lunar surface is reflected as energetic neutral atoms back to space, as established by remote sensing, e.g. by the SARA instrument on Chandrayaan-1 or by IBEX. Mapping of these reflected energetic neutral atoms to the surface opened a new way to remotely study the solar wind precipitation onto the surface. However, the high reflection rate remained an enigma given the high porosity of the lunar regolith, but no measurements directly on the surface were available.</p><p>With the Advanced Small Analyzer for Neutrals (ASAN) mounted on the Yuyu-2 the rover of Chang'E-4, for the first time measurements of the energetic neutral atom flux originating from the lunar surface were preformed directly on the lunar surface itself. ASAN measures with a single angular pixel the energy spectrum of energetic neutral atoms reflected or sputtered form the surface with coarse mass resolution. ASAN uses the mobility of the rover to cover different solar wind illumination angles and scattering angles from the surface.</p><p>Since the landing of Chang'E-4 in the Von Kármán crater on the lunar far side in January 2019, ASAN has spent more than one year on the lunar surface and performed typically two measurement sessions per lunar day with nominal performance.</p><p>We review the ASAN instrument status and operations; present energy and mass spectra of energetic neutral atoms backscattered and sputtered from the surface, and discuss sputtering yields observed during different observation sessions. We put these observations into context of earlier remote sensing data by the SARA instrument on Chandrayaan-1.</p>

What Does Our Heliosphere Look Like in Energetic Neutral Atoms? Some Recommendations for a Low-Energy ENA Camera Onboard the Interstellar Probe

2019 ◽  
Author(s):  
André Galli ◽  
Peter Wurz ◽  
Jens Kleimann ◽  
Horst Fichtner ◽  
Yoshifumi Futaana ◽  
...  
Keyword(s):  
Low Energy ◽  
Neutral Atoms ◽  
Energetic Neutral Atoms ◽  
Interstellar Probe

Imaging Saturns dust rings using energetic neutral atoms

1998 ◽  
Vol 46 (9-10) ◽  
pp. 1349-1362 ◽  
Author(s):  
B.H. Mauk ◽  
S.M. Krimigis ◽  
D.G. Mitchell ◽  
E.C. Roelof ◽  
E.P. Keath ◽  
...  
Keyword(s):  
Neutral Atoms ◽  
Energetic Neutral Atoms

Modeling energetic neutral atoms and the IBEX spectrum

2012 ◽  
Author(s):  
Jacob Heerikhuisen ◽  
Nikolai Pogorelov ◽  
Gary Zank
Keyword(s):  
Neutral Atoms ◽  
Energetic Neutral Atoms

scholarly journals Structure of the heliosheath from HSTOF energetic neutral atoms measurements

2018 ◽  
Vol 618 ◽  
pp. A26 ◽  
Author(s):  
A. Czechowski ◽  
M. Hilchenbach ◽  
K. C. Hsieh ◽  
M. Bzowski ◽  
S. Grzedzielski ◽  
...  
Keyword(s):  
Energy Range ◽  
Ecliptic Plane ◽  
High Energy ◽  
Neutral Atoms ◽  
Ion Distribution ◽  
Ion Density ◽  
Heliospheric Observatory ◽  
Energetic Neutral Atoms ◽  
Time Periods ◽  
Ecliptic Longitude

Context. From the year 1996 until now, High energy Suprathermal Time Of Flight sensor (HSTOF) on board Solar and Heliospheric Observatory (SOHO) has been measuring the heliospheric energetic neutral atoms (ENA) flux between ±17° from the ecliptic plane. At present it is the only ENA instrument with the energy range within that of Voyager LECP energetic ion measurements. The energetic ion density and thickness of the inner heliosheath along the Voyager 1 trajectory are now known, and the ENA flux in the HSTOF energy range coming from the Voyager 1 direction may be estimated. Aims. We use HSTOF ENA data and Voyager 1 energetic ion spectrum to compare the regions of the heliosheath observed by HSTOF and Voyager 1. Methods. We compared the HSTOF ENA flux data from the forward and flank sectors of the heliosphere observed in various time periods between the years 1996 and 2010 and calculated the predicted ENA flux from the Voyager 1 direction using the Voyager 1 LECP energetic ion spectrum and including the contributions of charge exchange with both neutral H and He atoms. Results. The ratio between the HSTOF ENA flux from the ecliptic longitude sector 210−300° (the LISM apex sector) for the period 1996−1997 to the estimated ENA flux from the Voyager 1 direction is ∼1.3, but decreases to ∼0.6 for the period 1996−2005 and ∼0.3 for 1998−2006. For the flank longitude sectors (120−210° and 300−30°), the ratio also tends to decrease with time from ∼0.6 for 1996−2005 to ∼0.2 for 2008−2010. We discuss implications of these results for the energetic ion distribution in the heliosheath and the structure of the heliosphere.

Energetic Neutral Atoms from the Heliotail Direction and their Potential Source Regions

2010 ◽  
Author(s):  
M. Hilchenbach ◽  
R. Kallenbach ◽  
K. C. Hsieh ◽  
A. Czechowski ◽  
Jakobus le Roux ◽  
...  
Keyword(s):  
Neutral Atoms ◽  
Source Regions ◽  
Potential Source ◽  
Energetic Neutral Atoms

Influence of asymmetries in the magnetic draping pattern at Titan on the emission of energetic neutral atoms

2018 ◽  
Vol 152 ◽  
pp. 142-164 ◽  
Author(s):  
Slawa Kabanovic ◽  
Moritz Feyerabend ◽  
Sven Simon ◽  
Zachary Meeks ◽  
Veit Wulms
Keyword(s):  
Neutral Atoms ◽  
Energetic Neutral Atoms
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