Search Publications
Emission lines of FeXI in the 257-407Å wavelength region observed in solar spectra from EIS/Hinode and SERTS
Mathioudakis, M.; Keenan, F. P.; Davila, J. M. +5 more
Theoretical emission-line ratios involving FeXI transitions in the 257-407Å wavelength range are derived using fully relativistic calculations of radiative rates and electron impact excitation cross-sections. These are subsequently compared with both long wavelength channel Extreme-Ultraviolet Imaging Spectrometer (EIS) spectra from the Hinode sat…
Automated Coronal-Loop Detection based on Contour Extraction and Contour Classification from the SOHO/EIT Images
Durak, Nurcan; Nasraoui, Olfa; Schmelz, Joan
Arch-shaped coronal loops that are isolated from the background are typically acquired manually from massive online image databases to be used in solar coronal research. The manual search for special coronal loops is not only subject to human mistakes but is also time consuming and tedious. In this study, we propose a completely automated image-re…
The gravitationally lensed, luminous infrared galaxy IRAS F10214+4724 observed with XMM-Newton
Sanders, D. B.; Vignali, C.; Iwasawa, K. +2 more
We report on a short XMM-Newton observation of the gravitationally lensed, luminous infrared galaxy IRAS F10214+4724 at z = 2.3 . A faint X-ray source is detected at 4 σ . The observed 0.5-2 keV (1.7-6.6 keV in the rest-frame) flux is 1.3 ×10-15erg cm - 2s-1 and the spectral slope in the rest-frame 1-10 keV band is…
On the nature of coronal loops above the quiet sun network
Peter, H.; Zacharias, P.; Bingert, S. +1 more
The structure and dynamics of a box in a stellar corona can be modeled employing a 3D MHD model for different levels of magnetic activity. Depending on the magnetic flux through the surface the nature of the resulting coronal structures can be quite different. We investigate a model of an active region for two sunspots surrounded by magnetic field…
Counterpart Candidates to the Unidentified Fermi Source 0FGL J1848.6-0138
Combi, J. A.; Luque-Escamilla, P. L.; Martí, J. +3 more
Here we report the finding of a few counterpart candidates inside the 95% confidence error box of the Fermi LAT unidentified gamma-ray source 0FGL J1848.6-0138. Among them, the globular cluster GLIMPSE-C01 is specially remarkable. It offers a conceivable physical scenario for gamma-ray production and if confirmed to be counterpart it would be the …
Perspectives Gained from a Combination of Polar, Cluster and ISEE Energetic Particle Measurements in the Dayside Cusp
Fritz, T. A.
Energetic particles are a consistent and common feature of the high-altitude dayside cusp. Observing these particles in a region where they cannot be stably trapped is one of the most striking findings of the Polar and Cluster satellites. The source of these cusp energetic particles (CEP) has centered on the possible role of the bow shock, leakage…
Monte Carlo simulations of X-ray continuum of SS433
Postnov, K. A.; Cherepashchuk, A. M.; Bisnovatyi-Kogan, G. S. +1 more
Results of Monte-Carlo simulation of X-ray continuum of the galactic superaccreting microquasar SS433 are presented. We use observations of INTEGRAL in 2003 and INTEGRAL/RXTE in 2004. A model of the object, based on the observational data, was created, and Monte-Carlo simulation was used to obtain the model spectrum. Comparison with the experiment…
SOHO/UVCS Detection of Turbulence in a Coronal Mass Ejection
Antonucci, E.; D'Amicis, R.; Telloni, D.
The intensity of the H I Lyα line measured by the UltraViolet Coronagraph Spectrometer (UVCS) onboard the Solar and Heliospheric Observatory (SOHO) is used to investigate the density turbulence within the coronal mass ejection (CME) occurred on 2006 December 24, in the South polar coronal hole. In order to compare the spectral index inside the CME…
Commissioning of the cosmic origins spectrograph on the Hubble Space Telescope: an overview of COS servicing mission observatory verification
Smith, T. Ed; Aloisi, Alessandra; France, Kevin +30 more
The Cosmic Origins Spectrograph (COS) was installed into the Hubble Space Telescope (HST) during Servicing Mission 4 (SM4) in May 2009. COS is designed to obtain spectra of faint objects at moderate spectral resolution (R > 16,000) in two channels: FUV, covering wavelengths from 1150 to 1450 Å and NUV, covering 1700 - 3200 Å. Two low resolution…
An Investigation of the Role of Propagation Effects in the Formation of Drifting Narrowband Type II Fiber Bursts on the Dynamic Spectrum
Afanasiev, A. N.
This paper investigates one of the kinds of fine structure of solar decametric type II radio bursts in the form of drifting narrowband fibers. The appearance of such a structure is customarily explained by the features of the radio emission mechanism in the source, which is formed when the shock wave catches up the previously-generated coronal mas…