Search Publications
AKARI observations of interstellar dust grains in our Galaxy and nearby galaxies
Oyabu, S.; Onaka, T.; Kaneda, H. +6 more
The infrared (IR) emission from interstellar dust grains is a powerful tool to trace star-formation activities in galaxies. Beyond such star-formation tracers, spectral information on polycyclic aromatic hydrocarbons (PAHs) and large grains, or even their photometric intensity ratios, has deep physical implications for understanding the properties…
Case study of climatic changes in Martian fluvial systems at Xanthe Terra
Kereszturi, Akos
An unnamed valley system was analyzed in Xanthe Terra south of Havel Vallis on Mars where three separate episodes of fluvial activity could be identified with different morphology, water source and erosional processes, inferring formation under different climatic conditions. The oldest scattered valleys (1. group) form interconnecting network and …
Megaflood analysis through channel networks of the Athabasca Valles, Mars based on multi-resolution stereo DTMs and 2D hydrodynamic modeling
Kim, Jung-Rack; Schumann, Guy; Neal, Jeffrey C. +1 more
Stereo analysis of in-orbital imagery provides valuable topographic data for scientific research over planetary surfaces especially for the interpretation of potential fluvial activity. The focus of research into planetary fluvial activity has been shifting toward quantitative modeling with various spatial resolution DTMs from visual interpretatio…
Titan's plasma environment: 3D hybrid kinetic modeling of the TA flyby and comparison with CAPS-ELS and RPWS LP observations
Hartle, R. E.; Sittler, E. C.; Cooper, J. F. +2 more
In this report we discuss the global plasma environment of the TA flyby from the perspective of 3D hybrid modeling. In our model the background, pickup, and ionospheric ions are considered as particles, whereas the electrons are described as a fluid. Inhomogeneous photoionization, electron-impact ionization and charge exchange are included in our …
Dust Impact Monitor (DIM) onboard Rosetta/Philae: Tests with ice particles as comet analog materials
Flandes, Alberto; Krüger, Harald; Loose, Alexander +2 more
In 2014 the European Space Agency's spacecraft Rosetta will encounter the short-period comet 67P/Churyumov-Gerasimenko. Rosetta carries the lander spacecraft Philae on board which will attempt to land on the comet's nucleus. Amongst Philae's instruments, the Dust Impact Monitor (DIM) using piezoelectric sensors is aimed at measuring the physical p…
Amazonian thermokarst in Danielson crater, Arabia Terra region, Mars
Baioni, Davide; Murana, Alessio; Tramontana, Mario
This paper describe the possible ice-related landforms observed within Danielson crater which is centered at about 8°N and 353°E, in the region of southwestern Arabia Terra about 800 km south of Becquerel crater.
A morphological survey of the study area through an analysis of the available Mars images was performed. The features of the landfo…Radio emission from dusty galaxies observed by AKARI
Takeuchi, T. T.; Pollo, A.; Solarz, A. +2 more
We probe radio-infrared correlation for two samples of extragalactic sources from the local Universe from the AKARI All-Sky Catalogue. The first, smaller sample (1053 objects) was constructed by the cross-correlation of the AKARI/FIS All-Sky Survey Bright Source Catalogue, the AKARI IRC All-Sky Survey Point Source Catalogue and the NRAO VLA Sky Su…
Radar investigations of Apollinaris Mons on Mars: Exploring the origin of the fan deposits
El-Maarry, M. R.; Heggy, E.; Dohm, J. M.
Apollinaris Mons is an isolated volcano on Mars straddling the boundary between the southern highlands and the northern plains. One of its most distinctive features is its massive fan-shaped deposit that extends from a breach on its summit to distances of more than 150 km and drapes its entire southern flank. The composition and formation mechanis…
Calibrating Mars Orbiter Laser Altimeter pulse widths at Mars Science Laboratory candidate landing sites
Muller, Jan-Peter; Grindrod, Peter M.; Gupta, Sanjeev +1 more
Accurate estimates of surface roughness allow quantitative comparisons between planetary terrains. These comparisons enable us to improve our understanding of commonly occurring surface processes, and develop a more complete analysis of candidate landing and roving sites. A (secondary) science goal of the Mars Orbiter Laser Altimeter was to map su…
Three predictions: Comet 67P/Churyumov-Gerasimenko, comet C/2012 K1 PANSTARRS, and comet C/2013 V5 Oukaimeden
Ferrín, Ignacio
We make the following predictions: (1) The secular light curve (SLC) of comet 67P/Churyumov-Gerasimenko exhibits a photometric anomaly in magnitude that is present in 1982, 1996, 2002 and 2009. Thus it must be real. We interpret this anomaly as a topographic feature on the surface of the nucleus that may be a field of debris, a region made only of…