Search Publications
Evidences of early aqueous Mars: Implications on the origin of branched valleys in the Ius Chasma, Mars
Martha, Tapas R.; Jain, Nirmala; Vamshi, Gasiganti T. +1 more
This study shows results of morphological and spectroscopic analyses of Ius Chasma and its southern branched valleys using Orbiter datasets such as Mars Reconnaissance Orbiter (MRO)-Compact Reconnaissance Imaging Spectrometer for Mars (CRISM), High Resolution Imaging Science Experiment (MRO-HiRISE) and digital terrain model (HRSC-DTM). Result of t…
Nitrogen condensation in Titan's atmosphere under contemporary atmospheric composition
Tokano, Tetsuya
Temperature profiles of Titan's atmosphere obtained by Cassini radio occultations approach the nitrogen condensation temperature curve at some places. This raises the question as to whether nitrogen, Titan's main atmospheric constituent, might condense in some seasons and areas contrary to previous perception. To address this question, possible ar…
XMM-Newton and NuSTAR joint observations of Mrk 915: a deep look into the X-ray properties
Campana, S.; Moretti, A.; Vignali, C. +5 more
We report on the X-ray monitoring programme (covering slightly more than 11 d) carried out jointly by XMM-Newton and NuSTAR on the intermediate Seyfert galaxy Mrk 915. The light curves extracted in different energy ranges show a variation in intensity but not a significant change in the spectral shape. The X-ray spectra reveal the presence of a tw…
Intermittency of the Solar Magnetic Field and Solar Magnetic Activity Cycle
Obridko, V. N.; Sokoloff, D. D.; Shibalova, A. S.
Small-scale solar magnetic fields demonstrate features of fractal intermittent behavior, which requires quantification. For this purpose we investigate how the observational estimate of the solar magnetic flux density B depends on resolution D in order to obtain the scaling lnBD=−k lnD +a in a reasonably wide range. The quantity k demon…
On IMF By -Induced Dawn-Dusk Asymmetries in Earthward Convective Fast Flows
Nilsson, H.; Hamrin, M.; Karlsson, T. +2 more
Recent Climate Variations
Head, James W.; Byrne, Shane; Mischna, Michael A. +2 more
Photoionization Modeling of Titan’s Dayside Ionosphere
Wahlund, J. -E.; Edberg, N. J. T.; Vigren, E. +4 more
Previous modeling studies of Titan’s dayside ionosphere predict electron number densities that are roughly a factor of 2 higher than those observed by the RPWS/Langmuir probe. The issue can equivalently be described as the ratio between the calculated electron production rates and the square of the observed electron number densities resulting in r…
Dynamical Study of the Exoplanet Host Binary System HD 106515
Rica, F. M.; Barrena, R.; Henríquez, J. A. +2 more
HD 106515 AB (STF1619 AB) is a high common proper motion and common radial velocity binary star system composed of two G-type bright stars located at 35 pc and separated by about 7 arcsec. This system was observed by the Hipparcos satellite with a precision in distance and proper motion of 3 and 2%, respectively. The system includes a circumprimar…
Modern Geometric Methods of Distance Determination
Pietrzyński, Grzegorz; Thévenin, Frédéric; Falanga, Maurizio +2 more
Building a 3D picture of the Universe at any distance is one of the major challenges in astronomy, from the nearby Solar System to distant Quasars and galaxies. This goal has forced astronomers to develop techniques to estimate or to measure the distance of point sources on the sky. While most distance estimates used since the beginning of the 20t…
The Acheron Dorsum on Mars: A novel interpretation of its linear depressions and a model for its evolution
Martino, Salvatore; De Blasio, Fabio Vittorio
The Acheron Dorsum north of Olympus Mons on Mars is a unique 800 km-long arcuate ridge apparently unrelated to other adjacent morphologies. Acheron Dorsum is crossed by deep and wide fractures ("fossae", here referred to also as Linear Depressions or "LDs"), commonly interpreted as grabens formed by local lithosphere stress in response to endogeno…