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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…
Visibility of Type III burst source location as inferred from stereoscopic space observations
Maksimovic, M.; Rucker, H. O.; Boudjada, M. Y. +1 more
We study solar Type III radio bursts simultaneously observed by RPWS/Cassini, URAP/Ulysses and WAVES/Wind experiments. The observations allows us to cover a large frequency bandwidth from 16MHz down to a few kHz. We consider the onset time of each burst, and estimate the corresponding intensity level. Also we measure the Langmuir frequency as obse…
North-South Asymmetry in the Distribution of Solar Background Magnetic Field
Obridko, V. N.; Chertoprud, V. E.; Kuzanyan, K. M.
The aim of this article is to investigate how the background magnetic field of the Sun behaves in different hemispheres. We used SOHO/MDI data obtained during a period of eight years from 2003 to 2011 to analyze the intensity distribution of the background magnetic field over the solar surface. We find that the background fields of both polarities…
A Magnified View of Star Formation at z = 0.9 From Two Lensed Galaxies
Veilleux, Sylvain; Rigby, Jane R.; Swinbank, Mark +1 more
We present new narrowband Hα imaging from the Hubble Space Telescope of two z = 0.91 galaxies that have been lensed by the foreground galaxy cluster A2390. These data probe spatial scales as small as ~0.3 kpc, providing a magnified look at the morphology of star formation at an epoch when the global star formation rate (SFR) was high. However, dus…
Oscillations in solar jets observed with the SOT of Hinode: viscous effects during reconnection
Koutchmy, S.; Tavabi, E.
Transverse oscillatory motions and recurrence behavior in the chromospheric jets observed by Hinode/SOT are studied. A comparison is considered with the behavior that was noticed in coronal X-ray jets observed by Hinode/XRT. A jet like bundle observed at the limb in Ca II H line appears to show a magnetic topology that is similar to X-ray jets (i.…
The Quiescent Counterpart of the Peculiar X-Ray Burster SAX J2224.9+5421
Degenaar, N.; Wijnands, R.; Miller, J. M.
SAX J2224.9+5421 is an extraordinary neutron star low-mass X-ray binary. It was discovered when it was exhibiting a ~= 10 s long thermonuclear X-ray burst, but it had faded to a 0.5-10 keV luminosity of L X <~ 8 × 1032(D/7.1 kpc)2 erg s-1 only ~= 8 hr later. It is generally assumed that neutron stars …
Contrasting electron acceleration processes during two substorms
Schriver, David; El-Alaoui, Mostafa; Walker, Raymond J. +3 more
Although energetic particle injections during substorms have been observed near geosynchronous orbit since the late 1960s, how the injected particles are accelerated during a substorm is still not fully understood. Studies show that injections are associated with earthward propagating dipolarization fronts and suggest that particle acceleration ca…
Simulated (STEREO) Views of the Solar Wind Disturbances Following the Coronal Mass Ejections of 1 August 2010
Feng, X. S.; Zhang, Y.; Dryer, M. +7 more
Images observed by the twin spacecraft Solar TErrestrial RElations Observatory (STEREO) A and B appear as complex structures for two coronal mass ejections (CMEs) on 1 August 2010. Therefore, a series of sky maps of Thomson-scattered white light by interplanetary coronal mass ejections (ICMEs) on 1 August 2010 are simulated using the Hakamada-Akas…
The pros and cons of the inversion method approach to derive 3D dust emission properties in the ISM: the Hi-GAL field centred on (l, b) = (30°, 0°)
Alves, M. I. R.; Davies, R. D.; Davis, R. J. +13 more
Herschel far-infrared continuum data obtained as part of the Hi-GAL survey have been used, together with the GLIMPSE 8 µm and MIPSGAL 24 µm data, to attempt the first 3D-decomposition of dust emission associated with atomic, molecular and ionized gas at 15 arcmin angular resolution. Our initial test case is a 2 × 2 square degrees regio…
Astrophysical data mining with GPU. A case study: Genetic classification of globular clusters
Paolillo, M.; Brescia, M.; Cavuoti, S. +4 more
We present a multi-purpose genetic algorithm, designed and implemented with GPGPU/CUDA parallel computing technology. The model was derived from our CPU serial implementation, named GAME (Genetic Algorithm Model Experiment). It was successfully tested and validated on the detection of candidate Globular Clusters in deep, wide-field, single band HS…