Results 71 to 80 of about 8,179,295 (185)

CASTAway:An Asteroid Main Belt Tour and Survey. [PDF]

open access: yes, 2017
CASTAway is a mission concept to explore our Solar System’s main asteroid belt. Asteroids and comets provide a window into the formation and evolution of our Solar System and the composition of these objects can be inferred from space-based remote ...
Kinch, Kjartan Münster   +245 more
core   +2 more sources

The Bulk Densities of Small Solar System Bodies as a Probe of Planetesimal Formation

open access: yesThe Astrophysical Journal
Constraining the formation processes of small solar system bodies is crucial for gaining insights into planetesimal formation. Their bulk densities, determined by their compressive strengths, offer valuable information about their formation history.
Misako Tatsuuma   +3 more
doaj   +1 more source

Development of an adjustable dynamic phantom for testing deviceless motion correction algorithm in PET

open access: yesMedical Physics, Volume 53, Issue 8, August 2026.
Abstract Background Respiratory motion during PET Imaging leads to blurring, volumetric overestimation, and reduced quantitative accuracy. Deviceless motion correction algorithms (MCA) such as OncoFreeze (OF) by Siemens Healthineers (Forchheim, Germany) extract respiratory waveforms from list‐mode data but require validation that cannot be obtained in ...
Christian Kühnel   +6 more
wiley   +1 more source

MMS Observations of Multi‐Species Wave‐Particle Interactions and Rapid Foreshock Evolution

open access: yesJournal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The ion foreshock is the region upstream of Earth's bow shock where magnetic field lines connect to the quasi‐parallel shock surface. Within this region, there exist a variety of backstreaming ion populations from the shock ramp that can generate ultra‐low frequency (ULF) waves through wave‐particle interactions. In this work, we use data from
Guan Le   +11 more
wiley   +1 more source

Fundamental Poloidal Wave Event Extending From Midnight to Dawn

open access: yesJournal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Fundamental poloidal (P1) waves are a class of magnetospheric standing Alfvén waves characterized by field line oscillations in the meridional plane. P1 waves are infrequently excited in the ring current region and are believed to be the source of giant pulsations (Pgs) observed on the ground. Pgs are mostly detected on the morning side with a
Kazue Takahashi   +2 more
wiley   +1 more source

Orbital, Latitudinal, and Diurnal Variations in Meteoroid Influx, Atmospheric Ablation and Ionization, and Micrometeorite Accretion at Venus

open access: yesThe Planetary Science Journal
This study provides a comprehensive description of the meteoric cycle on Venus, considering the temporal, latitudinal, and orbital variations of meteoroid mass influx before atmospheric entry, the ablation rates and the subsequent ionization of meteoric ...
Juan Diego Carrillo-Sánchez   +3 more
doaj   +1 more source

Structural Evolution of Antigorite by High‐Velocity Impacts

open access: yesJournal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Serpentine is a major hydrous mineral present in hydrous asteroids that have evolved through planetary impacts. Understanding its dynamic behavior is essential to elucidate the redistribution and retention of water during high‐velocity impact processes. The shock response of antigorite was examined at pressures up to 106 GPa using laser‐driven
Yuhei Umeda   +17 more
wiley   +1 more source

Study of the physical properties of selected active objects in the main belt and surrounding regions by broadband photometry

open access: yes, 2020
Dynamically different groups of comets and active asteroids with orbits at 2 - 5 a. u. show dust activity in varying degrees and forms. Photometric study and comparison of physical parameters can help to classify mechanisms and nature of the activity ...
Hellmich, Stephan   +11 more
core   +1 more source

Main-Belt Comets as Tracers of Ice in the Inner Solar System [PDF]

open access: yesProceedings of the International Astronomical Union, 2012
AbstractAs a recently recognized class of objects exhibiting apparently cometary (sublimation-driven) activity yet orbiting completely within the main asteroid belt, main-belt comets (MBCs) have revealed the existence of present-day ice in small bodies in the inner solar system and offer an opportunity to better understand the thermal and compositional
openaire   +2 more sources

Surface Clutter Separation for Asteroid Radar Imaging in the Tianwen-2 Mission

open access: yesThe Astronomical Journal
The Tianwen-2 probe carries an asteroid core-scanning radar (ACSR) to study the internal structures of near-Earth asteroid 2016 HO _3 and main-belt comet 311P.
Wei Guan   +15 more
doaj   +1 more source

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