Search Publications
Dense molecular cloud cores as a source of micrometer-sized grains in galaxies
Li, Zhi-Yun; Hirashita, Hiroyuki; Nozawa, Takaya +2 more
Coreshine in dense molecular cloud cores (dense cores) is interpreted as evidence for micrometer-sized grains (referred to as very large grains, VLGs). VLGs may have a significant influence on the total dust amount and the extinction curve. We estimate the total abundance of VLGs in the Galaxy, assuming that dense cores are the site of VLG formati…
A multifractal approach applied to the magnetic field turbulence in Jupiter's magnetosheath
Bolzan, M. J. A.; Echer, E.
We studied the magnetic field turbulence in Jupiter's magnetosheath during the Ulysses inbound trajectory in 1992. This analysis was conducted using nonlinear techniques such as kurtosis, probability density functions, multifractal approach and wavelet analysis. The results from the PDFs and kurtosis analysis, for each magnetic field component, sh…
Magnetic pileup boundary and field draping at Comet Halley
Volwerk, M.; Bertucci, C.; Delva, M. +2 more
The approach of the Rosetta S/C to Comet Churyumov-Gerasimenko in 2014 reactivates the interest in the plasma interaction of the solar wind with the cometary coma. In preparation for the upcoming S/C observations and the start of outgassing of the cometary nucleus, we reinvestigate the magnetic field data from the Vega-1 S/C at the flyby of Comet …
Constraints on Jupiter's stratospheric HCl abundance and chlorine cycle from Herschel/HIFI
Fletcher, L. N.; Irwin, P. G. J.; Teanby, N. A. +1 more
Detection of HCl on Jupiter would provide insight into the chlorine cycle and external elemental fluxes on giant planets, yet so far has not been possible. Here we present the most sensitive search for Jupiter's stratospheric HCl to date using observations of the 625.907 and 1876.221 GHz spectral lines with Herschel's HIFI instrument. HCl was not …
Water and Martian habitability: Results of an integrative study of water related processes on Mars in context with an interdisciplinary Helmholtz research alliance “Planetary Evolution and Life”
Jaumann, R.; Tirsch, D.; Hiesinger, H. +7 more
A study in context with the Helmholtz Alliance 'Planetary Evolution and Life' focused on the (temporary) existence of liquid water, and the likelihood that Mars has been or even is a habitable planet. Both geomorphological and mineralogical evidence point to the episodic availability of liquid water at the surface of Mars, and physical modeling an…
Analysis of Rosetta/VIRTIS spectra of earth using observations from ENVISAT/AATSR, TERRA/MODIS and ENVISAT/SCIAMACHY, and radiative-transfer simulations
Oliva, F.; Irwin, P. G. J.; Capaccioni, F. +7 more
Rosetta, the Solar System cornerstone mission of ESA's Horizon 2000 programme, consists of an orbiter and a lander, and is due to arrive at the comet 67P/Churyumov-Gerasimenko in May 2014. Following its 2004 launch, Rosetta carried out a series of planetary fly-bys and gravitational assists. On these close fly-bys of the Earth, measurements were t…
Possible erosion marks of bottom oceanic currents in the northern lowlands of Mars
De Blasio, Fabio Vittorio
There has been much interest for the hypothetical ancient ocean which might have resided in the northern lowlands of Mars. Hints are the global subdivision of Martian crust, the smooth appearance of the northern terrains, the elevation of river deltas, and the past shorelines. Here it is suggested that water in a sufficiently deep northern ocean w…
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…