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Dynamical evolution of the inner heliosphere approaching solar activity maximum: interpreting Ulysses observations using a global MHD model
Riley, P.; Linker, J. A.; Mikic, Z.
In this study we describe a series of MHD simulations covering the time period from 12 January 1999 to 19 September 2001 (Carrington Rotation 1945 to 1980). This interval coincided with: (1) the Sun's approach toward solar maximum; and (2) Ulysses' second descent to the southern polar regions, rapid latitude scan, and arrival into the northern pol…
Launch of solar coronal mass ejections and submillimeter pulse bursts
Rovira, M.; Levato, H.; Kaufmann, Pierre +4 more
The rapid solar spikes (100-500 ms) recently discovered at submillimeter waves bring new possibilities to investigate energetic processes near the solar surface that might have an important role in the launch and propelling of ionized mass away from the Sun. We present a study on the association between the launch time of coronal mass ejections (C…
Neutron-induced nuclear reactions and degradation in germanium detectors
Cordier, B.; Jean, P.; von Ballmoos, P. +15 more
We have measured cross sections of neutron-induced nuclear reactions leading to the delayed production of gamma -ray lines similar to the ones of astrophysical interest. Conclusions were drawn concerning the expected background in the 26Al 1809 keV line and the 7Be 478 keV line in SPI. The neutron-induced degradation of Ge de…
Hot Stars: Old-Fashioned or Trendy? (With 24 Figures)
Pauldrach, A. W. A.
Spectroscopic analyses with the intention of the interpretation of the UV-spectra of the brightest stars as individuals - supernovae - or as components of star-forming regions - massive O stars - provide a powerful tool with great astrophysical potential for the determination of extragalactic distances and of the chemical composition of star-formi…
First evidence of IMF control of Jovian magnetospheric boundary locations: Cassini and Galileo magnetic field measurements compared
Kivelson, Margaret G.; Southwood, David J.
The Cassini spacecraft, en route to Saturn, passed close to Jupiter while the Galileo spacecraft was completing its 28th and 29th orbits of Jupiter, thus offering a unique opportunity for direct study of the solar wind-Jovian interaction. Here evidence is given of response of the Jovian magnetopause and bow shock positions to changes of the north-…
Hubble Space Telescope NICMOS Observations of the Embedded Cluster in NGC 2024: Constraints on the Initial Mass Function and Binary Fraction
Young, Erick T.; Meyer, Michael R.; Cotera, Angela S. +1 more
We present an analysis of NICMOS observations of the embedded cluster associated with NGC 2024. An analysis of the cluster color-magnitude diagram (CMD) using the models of D'Antona & Mazzitelli and Baraffe et al. (published in 1997 and 1998, respectively) indicates that the ratio of intermediate-mass (1.0-10.0 Msolar) to low-mass (…
On the Origin of the High-Ionization Intermediate-Velocity Gas toward HD 14434
Sembach, Kenneth R.; Meyer, David M.; Lauroesch, James T. +2 more
We present Far-Ultraviolet Spectroscopic Explorer and Space Telescope Imaging Spectrograph observations of high-ionization interstellar absorption toward HD 14434 (l=135.1d, b=-3.8d d~2.3 kpc), an O5.5 V star in the Perseus OB1 association. Intermediate-velocity interstellar Si IV and C IV absorption is present at VLSR=-67 km s-1
Status of the Integral/IBIS telescope modeling and of the response matrices generation
Goldoni, P.; Malaguti, G.; Bird, A. J. +8 more
The main objective of the IBIS modeling activities is the generation of the IBIS spectral response matrices. This generation has been done step by step by firstly constructing a ``calibrated model" of each IBIS sub-system. A ``calibrated model" is defined as a GEANT Monte-Carlo model, further checked by intensive corresponding calibration. These c…
The nature of X-ray selected extremely red objects
Ivison, R. J.; Smail, Ian; Page, M. J. +4 more
We report on the X-ray, optical, near-infrared, submillimetre and radio properties of five extremely red objects (EROs) selected at X-ray wavelengths by XMM-Newton in the Lockman Hole field. They all have enough counts in the X-ray band to allow spectral fitting: four are most probably obscured, Compton-thin active galactic nuclei (AGNs) with reds…
Cooling out the radiation damage on the XMM-Newton EPIC MOS CCDs
Altieri, B.; Bennie, P. J.; Turner, M. J. L. +2 more
The X-ray astronomy satellite XMM-Newton has been in an orbit taking it through the trapped radiation belts and direct solar proton flux during the peak of the current solar cycle for over two and a half years. The MOS CCD detectors (E2V CCD22's) have degraded in charge transfer efficiency (CTE) as a result of damage created by high energy protons…