Search Publications
Imaging the heliosheath using HSTOF energetic neutral atoms and Voyager 1 ion data
Hsieh, K. C.; Hilchenbach, M.; Czechowski, A. +2 more
Context: Voyager 1 and 2 LECP instruments measure the distributions of the heliosheath ions of energies ≥40 keV. This threshold energy is an order of magnitude higher than the maximum energy (6 keV) of the energetic neutral atoms (ENA) to be measured by the forthcoming IBEX mission. On the other hand, the energy range of SOHO/CELIAS/HSTOF ENA meas…
FESTIVAL: A Multiscale Visualization Tool for Solar Imaging Data
Auchère, F.; Bocchialini, K.; Soubrié, E. +1 more
Since 4 December 2006, the SECCHI instrument suites onboard the two STEREO A and B probes have been imaging the solar corona and the heliosphere on a wide range of angular scales. The EUVI telescopes have a plate scale of 1.7 arcseconds pixel−1, while that of the HI2 wide-angle cameras is 2.15 arcminutes pixel−1, i.e. 75 time…
The Very Soft X-Ray Spectrum of the Double Pulsar System J0737-3039
Camilo, F.; Rea, N.; Possenti, A. +5 more
We present the results of an 80 ks Chandra ACIS-S observation of the double pulsar system J0737-3039. Furthermore, we report on spectral, spatial and timing analysis of the combined X-ray observations performed so far for this system. Fitting a total of ~1100 photons, we show that the X-ray spectrum of the J0737-3039 system is very soft, and not s…
Magnetic reconnection processes induced by a CME expansion
Romoli, M.; Bemporad, A.; Landini, F. +1 more
On 10 11 December 2005 a slow CME occurred in the Western Hemisphere in between two coronal streamers. SOHO/MDI magnetograms show a multipolar magnetic configuration at the photosphere: a complex of active regions located at the CME source and two bipoles at the base of the lateral coronal streamers. White light observations reveal that the CME ex…
Far-Ultraviolet Spectral Analysis of the Prototype Nova-like Variable VY Sculptoris from the High State to the Low State
Sion, Edward M.; Hamilton, Ryan T.
The prototype nova-like variable VY Sculptoris was observed by the IUE during four different optical brightness states of the system. The far-ultraviolet (FUV) flux level from the highest state to the lowest state declines by a factor of 28. We have carried out model accretion disk and white dwarf atmosphere fitting to the spectra. The correspondi…
Magnetic topology of blinkers
Doyle, J. G.; Madjarska, M. S.; Maclean, R. C. +2 more
Context: Co-spatial and co-temporal spectroscopic, imaging and magnetogram data enable us to better understand various solar transient phenomena. Here, we study brightening events in the transition region of the quiet Sun, also called “blinkers”.
Aims: We aim to investigate the physical mechanism responsible for blinkers.
Methods: An autom…
Characteristic Parameters of Drift Vortices Coupled to Alfvén Waves in an Inhomogeneous Space Plasma
Sundkvist, David; Bale, Stuart D.
We present detailed measurements of ion scale vortices of drift type coupled to Alfvén waves in an inhomogeneous and collisionless space magnetoplasma. The two free parameters of a dipolar vortex, intensity and spatial radius, are measured. The vortices are driven by a strong density gradient on a boundary layer with scale size of the same order a…
An infrared-submillimeter study of starforming regions selected by the ISOSS 170 µm survey
Krause, O.; Birkmann, S. M.; Lemke, D. +1 more
Context: Using the ISOPHOT Serendipity Survey (ISOSS) at 170 µm, a sample of galactic starforming regions has been established that exhibits very cold dust temperatures (< 20 K) and high masses (> 100 M_⊙).
Aims: We characterize the starforming content of five regions that were selected as potential sites of high-mass star formatio…
The Structure of Active Merger Remnant NGC 6240 from IRAC Observations
Fazio, Giovanni G.; Wang, Zhong; Karovska, Margarita +1 more
NGC 6240 is a rare object in the local universe: an active merger remnant viewed at the point of merging where two active galactic nuclei are visible. We present IRAC data of this object, providing high-sensitivity maps of the stellar and PAH distribution in this complicated system. We use photometry to analyze the variation in these distributions…
Diagnostic of the temperature and differential emission measure (DEM) based on Hinode/XRT data
Siarkowski, M.; Falewicz, R.; Rudawy, P. +1 more
We discuss here various methodologies and an optimal strategy of the temperature and emission measure diagnostics based on Hinode X-Ray Telescope data. As an example of our results we present the determination of the temperature distribution of the X-rays emitting plasma using a filters ratio method and three various methods of the calculation of …