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.

scholarly journals The Energetic Particle Detector

2020 ◽  
Vol 642 ◽  
pp. A7 ◽  
Author(s):  
J. Rodríguez-Pacheco ◽  
R. F. Wimmer-Schweingruber ◽  
G. M. Mason ◽  
G. C. Ho ◽  
S. Sánchez-Prieto ◽  
...  
Keyword(s):  
Energy Range ◽  
Energetic Particle ◽  
Ecliptic Plane ◽  
High Energy ◽  
Energetic Particles ◽  
Wide Energy Range ◽  
High Temporal Resolution ◽  
Particle Detector ◽  
Heliographic Latitude ◽  
Inner Heliosphere

After decades of observations of solar energetic particles from space-based observatories, relevant questions on particle injection, transport, and acceleration remain open. To address these scientific topics, accurate measurements of the particle properties in the inner heliosphere are needed. In this paper we describe the Energetic Particle Detector (EPD), an instrument suite that is part of the scientific payload aboard the Solar Orbiter mission. Solar Orbiter will approach the Sun as close as 0.28 au and will provide extra-ecliptic measurements beyond ∼30° heliographic latitude during the later stages of the mission. The EPD will measure electrons, protons, and heavy ions with high temporal resolution over a wide energy range, from suprathermal energies up to several hundreds of megaelectronvolts/nucleons. For this purpose, EPD is composed of four units: the SupraThermal Electrons and Protons (STEP), the Electron Proton Telescope (EPT), the Suprathermal Ion Spectrograph (SIS), and the High-Energy Telescope (HET) plus the Instrument Control Unit that serves as power and data interface with the spacecraft. The low-energy population of electrons and ions will be covered by STEP and EPT, while the high-energy range will be measured by HET. Elemental and isotopic ion composition measurements will be performed by SIS and HET, allowing full particle identification from a few kiloelectronvolts up to several hundreds of megaelectronvolts/nucleons. Angular information will be provided by the separate look directions from different sensor heads, on the ecliptic plane along the Parker spiral magnetic field both forward and backwards, and out of the ecliptic plane observing both northern and southern hemispheres. The unparalleled observations of EPD will provide key insights into long-open and crucial questions about the processes that govern energetic particles in the inner heliosphere.

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 PHEMTO: the polarimetric high energy modular telescope observatory

2021 ◽  
Author(s):  
P. Laurent ◽  
F. Acero ◽  
V. Beckmann ◽  
S. Brandt ◽  
F. Cangemi ◽  
...  
Keyword(s):  
Black Holes ◽  
Energy Range ◽  
High Performance ◽  
Angular Resolution ◽  
High Energy ◽  
Thermal Processes ◽  
Scientific Performance ◽  
X Ray ◽  
Measurement Capability ◽  
Better Than

AbstractBased upon dual focusing techniques, the Polarimetric High-Energy Modular Telescope Observatory (PHEMTO) is designed to have performance several orders of magnitude better than the present hard X-ray instruments, in the 1–600 keV energy range. This, together with its angular resolution of around one arcsecond, and its sensitive polarimetry measurement capability, will give PHEMTO the improvements in scientific performance needed for a mission in the 2050 era in order to study AGN, galactic black holes, neutrons stars, and supernovae. In addition, its high performance will enable the study of the non-thermal processes in galaxy clusters with an unprecedented accuracy.

scholarly journals Recent Results from IceCube

2018 ◽  
Vol 46 ◽  
pp. 1860048 ◽  
Author(s):  
Dawn Williams
Keyword(s):  
Energy Range ◽  
Neutrino Oscillation ◽  
Atmospheric Neutrino ◽  
High Energy ◽  
South Pole ◽  
Neutrino Interactions ◽  
Diffuse Flux ◽  
High Energy Neutrinos

The IceCube Neutrino Observatory is a cubic kilometer detector located at the geographic South Pole. IceCube was designed to detect high-energy neutrinos from cosmic sources, and the DeepCore extension of IceCube enables the study of atmospheric neutrino interactions down to energies of a few GeV. IceCube has detected a diffuse flux of neutrinos in the energy range from 100 TeV to several PeV, the properties of which are inconsistent with an atmospheric origin, and has also published competitive limits on atmospheric neutrino oscillation parameters and other neutrino properties. This paper presents the latest results from IceCube and prospects for future upgrades and expansions of the detector.

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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