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Inverse scattering problem in turbulent magnetic fluctuations
Narita, Yasuhito; Baumjohann, Wolfgang; Treumann, Rudolf A.
We apply a particular form of the inverse scattering theory to turbulent magnetic fluctuations in a plasma. In the present note we develop the theory, formulate the magnetic fluctuation problem in terms of its electrodynamic turbulent response function, and reduce it to the solution of a special form of the famous Gelfand-Levitan-Marchenko equatio…
An objective classification of Saturn cloud features from Cassini ISS images
Del Genio, Anthony D.; Barbara, John M.
A k-means clustering algorithm is applied to Cassini Imaging Science Subsystem continuum and methane band images of Saturn's northern hemisphere to objectively classify regional albedo features and aid in their dynamical interpretation. The procedure is based on a technique applied previously to visible-infrared images of Earth. It provides a new …
Probing the interstellar dust in galaxies over >10 Gyr of cosmic history
York, Donald G.; Kulkarni, Varsha P.; Welty, Daniel E. +3 more
Dust has a profound effect on the physics and chemistry of the interstellar gas in galaxies and on the appearance of galaxies. Understanding the cosmic evolution of dust with time is therefore crucial for understanding the evolution of galaxies. Despite the importance of interstellar dust, very little is known about its nature and composition in d…
Suzaku observations of two diffuse hard X-ray source regions, G22.0+0.0 and G23.5+0.1
Bamba, Aya; Yamauchi, Shigeo; Sumita, Mayu
G22.0+0.0 and G23.5+0.1 are diffuse hard X-ray sources discovered in the ASCA Galactic Plane Survey. We present Suzaku results of spectral analysis for these sources. G22.0+0.0 is confirmed to be a largely extended emission. Its spectra were represented by a highly absorbed power-law model with a photon index of 1.7 ± 0.3 and a moderately absorbed…
Chromospheric activity in sunspot light bridges
Louis, R. E.
High-resolution filtergrams from Hinode were used to analyse the nature of chromospheric activity over a set of five sunspot light bridges. The broad-band Ca II H filtergrams depict a variety of phenomena which include large arc-shaped brightenings, bright patches, and small-scale jets. These strong brightenings are recurrent over a duration of se…
Spectroscopic study of the peculiar galaxy IC 883
Burenkov, A. N.; Karataeva, G. M.; Yakovleva, V. A. +3 more
We analyze new optical spectroscopic observations obtained at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences with the SCORPIO focal reducer (in the modes of a Fabry-Perot interferometer (FPI) and long-slit spectroscopy) and the Multi-Pupil Fiber Spectrograph for the galaxy IC 883. We have confirmed th…
The puzzling properties of the magnetic O star Tr16-22
Neiner, Coralie; Morrell, Nidia; Nazé, Yaël +4 more
Context. The detection of bright, hard, and variable X-ray emission in Tr16-22 prompted spectropolarimetric observations of this star, which in turn led to the discovery of a surface magnetic field.
Aims: We want to further constrain the properties of this star, in particular to verify whether X-ray variations are correlated to changes in opt…
Planetary science: Cometary dust under the microscope
Kolokolova, Ludmilla
The Rosetta spacecraft made history by successfully orbiting a comet. Data from the craft now reveal the structure of the comet's dust particles, shedding light on the processes that form planetary systems. See Letter p.73
Long term average distribution of O +
Wang, Jing; Cao, Jinbin; Liu, Wenlong
Cluster measurements from 2001 to 2011 provide a unique opportunity to study the characteristics of
First geodetic VLBI sessions with the Chinese Deep Space Stations Jiamusi and Kashi
Wang, Guangli; Xu, Dezhen; Dong, Guangliang +2 more
The first three 24-h S/X dual-band geodetic VLBI sessions using two new Chinese Deep Space Stations (CDSSs), Jiamusi and Kashi, and four Chinese VLBI Stations (CVSs), Beijing, Kunming, Seshan, and Urumqi were conducted with the goal of improving the two CDSSs' positions, which were previously known to a few decimeters. Due to the limited frequency…