Search Publications
Non-Varying Granulation and Photospheric Network During the Extended 2007 - 2009 Solar Minimum
Utz, D.; Hanslmeier, A.; Muller, R.
We have analysed the wide band images taken by Hinode/SOT, in a blue continuum window and in the G-band, more or less on a daily basis in the frame of the synoptic program, to investigate the variation of the solar granulation and of the photospheric network with the activity cycle. A particular attention has been given to disentangle solar effect…
Suzaku observation of the Galactic supernova remnant CTB 37A (G348.5+0.1)
Hudaverdi, M.; Ercan, E. N.; Sezer, A. +1 more
In this paper, we present the results of the observations of CTB 37A obtained with the X-ray imaging spectrometer onboard the Suzaku satellite. The X-ray spectrum of CTB 37A is fitted well by two components: a single-temperature ionization equilibrium component (VMEKAL), with solar abundances, an electron temperature of kTe∼ 0.6 keV and…
Studying the long-time variability of the Seyfert 2 galaxy NGC 4388 with INTEGRAL and Swift
Beckmann, V.; Soldi, S.; Neronov, A. +1 more
We present analysis results on the Seyfert 2 galaxy NGC 4388 based on 6 yr of INTEGRAL data combined with Swift/Burst Alert Telescope survey and Swift/X-Ray Telescope pointed observations. These data, taken from 2003 to 2009, allow us to study the broad-band properties of this active galactic nucleus in the 0.3-300 keV energy range. The continuum …
Charged particle acceleration by intermittent electromagnetic turbulence
Petrukovich, A. A.; Zelenyi, L. M.; Artemyev, A. V. +2 more
We studied the role of intermittency in the process of acceleration and transport of charged particles by electromagnetic turbulence. We propose a simple model of electromagnetic turbulence with a variable level of intermittency. The magnetic field is described as a superposition of an ensemble of magnetostatic plane waves and of spatially localiz…
Jovian chromophore characteristics from multispectral HST images
Simon-Miller, Amy A.; Chanover, Nancy J.; Strycker, Paul D. +2 more
The chromophores responsible for coloring the jovian atmosphere are embedded within Jupiter's vertical aerosol structure. Sunlight propagates through this vertical distribution of aerosol particles, whose colors are defined by ϖ0( λ), and we remotely observe the culmination of the radiative transfer as I/ F( λ). In this study, we employ…
Chaos formation by sublimation of volatile-rich substrate: Evidence from Galaxias Chaos, Mars
Head, J. W.; Pedersen, G. B. M.
Galaxias Chaos deviates significantly from other chaotic regions due to the lack of associated outflow channels, lack of big elevation differences between the chaos and the surrounding terrain and due to gradual trough formation. A sequence of troughs in different stages is observed, and examples of closed troughs within blocks suggest that the tr…
An assessment and test of Enceladus as an important source of Saturn’s ring atmosphere and ionosphere
Ip, Wing-Huen; Tseng, Wei-Ling
The existence of an oxygen exosphere and ionosphere in Saturn’s main ring region has been confirmed by the Saturn Orbital Insertion (SOI) observations of the Cassini spacecraft. Through the ion-molecule collisions, the ring atmosphere could serve as a source of O2+ ions throughout Saturn’s magnetosphere. If photolysis of ice in the main rings is t…
The halo and rings of the planetary nebula NGC 40 in the mid-infrared
Ramos-Larios, G.; Phillips, J. P.; Cuesta, L. C.
We present the imaging and spectroscopy of NGC 40 acquired using the Spitzer Space Telescope and the Infrared Space Observatory. These are used to investigate the nature of emission from the central nebular shell, from the nebular halo and from the associated circumnebular rings. It is pointed out that a variety of mechanisms may contribute to the…
Tracking corotating interaction regions from the Sun through to the orbit of Mars using ACE, MEX, VEX, and STEREO
Fränz, M.; Davies, J. A.; Lester, M. +3 more
We study the propagation of corotating interaction regions (CIRs) through the inner heliosphere during the solar minimum of 2007-2008 using the Advanced Composition Explorer (ACE), Mars Express (MEX), Venus Express (VEX), and the Solar Terrestrial Relations Observatory (STEREO). We present observations of 24 CIRs observed during the period from 1 …
The Solar Decimetric Spike Burst of 2006 December 6: Possible Evidence for Field-aligned Potential Drops in Post-eruption Loops
White, S. M.; Balasubramaniam, K. S.; Cliver, E. W.
A 1.4 GHz solar radio burst associated with a 3B/X6 eruptive flare on 2006 December 6 had the highest peak flux density (~106 sfu) of any event yet recorded at this frequency. The decimetric event characteristics during the brightest emission phase (numerous intense, short-lived, narrow-band bursts that overlapped to form a continuous s…