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AKARI (ASTRO-F): Flight performance and preliminary results
Shibai, Hiroshi
ASTRO-F, which is the first Japanese satellite mission dedicated to the infrared wavelength region, was successfully launched on February 21, 2006 (UT), and was named "AKARI". The telescope has a 69 cm aperture, and is cooled to 6 K with super-fluid helium and mechanical coolers. AKARI is designed for the most advanced all-sky survey in the mid- a…
Total Solar Irradiance and the Fe XIV Corona
Rušin, Vojtech; Minarovjech, Milan; Saniga, Metod
Analyzing daily values of the total solar irradiance (TSI), the coronal index of solar activity (CI), and the Mg II 280-nm core-to-wing ratio (Mg II index), we have found that the temporal variations of these indices are very similar to each other during the period from 1978 to 2005. The correlation between CI and TSI, with the PSI correction lyin…
Albedo and photometric study of Mars with the Planetary Fourier Spectrometer on-board the Mars Express mission
Colangeli, L.; Formisano, V.; Palomba, E. +3 more
The Short Wavelength Channel of the Planetary Fourier Spectrometer (PFS) covers the 8333-1750 cm-1 (1.2-5.7 µm) spectral range, that is well suited to study the reflectance properties of the martian soil. These properties vary with time due to the dust dynamics in the martian environment. Wind can blow off dust exposing soil and f…
Effects of Dispersion of Wave Packets in the Determination of Lifetimes of High-Degree Solar p Modes from Time Distance Analysis: MDI Data
Chou, Dean-Yi; Ladenkov, Oleg
The cross-correlation function of solar p modes in a time - distance analysis changes with travel distance (or travel time). The exponential decrease in the amplitude of the cross-correlation function with travel distance has been interpreted as the dissipation of solar p-mode power and used to determine the lifetimes of high-degree p modes. It is…
PSR J1119–6127 and the X-ray emission from high magnetic field radio pulsars
Camilo, F.; Gaensler, B. M.; Gonzalez, M. E. +2 more
The existence of radio pulsars having inferred magnetic fields in the magnetar regime suggests that possible transition objects could be found in the radio pulsar population. The discovery of such an object would contribute greatly to our understanding of neutron star physics. Here we report on unusual X-ray emission detected from the radio pulsar…
Morphological Study of Quiescent Streamers during Solar Minimum by Ultraviolet Emission Lines
Akinari, Nakagawa
We perform, by utilizing spectroscopic measurements made with SOHO/UVCS, a morphological characterization of the quiescent streamer during solar minimum, by means of both a comprehensive survey of daily synoptic observations over 33 weeks from 1996 April to November and detailed analysis of several specialized observations targeting quiescent stre…
A three-dimensional kinetic-fluid numerical code to study the equilibrium structure of the magnetotail: The role of electrons in the formation of the bifurcated current sheet
Veltri, P.; Zimbardo, G.; Greco, A. +1 more
In this work we present a new stationary three-dimensional kinetic-fluid code with ions represented by particles and electrons by a massless fluid. The magnetotail current sheet is modeled as a magnetic field reversal with a normal magnetic field component Bn. A cross tail electric field Ey is included. An ion test particle s…
Sulfur Abundance in the Slow Solar Wind
Wurz, P.; Ipavich, F. M.; Opitz, A. +2 more
Using 4 years of data from the Mass Time-of-Flight and Proton Monitor, two CELIAS sensors on board SOHO, we report the sulfur abundances in comparison to magnesium and calcium (two low first ionization potential elements) for the slow solar wind, and for the first time we measure the sulfur isotopic abundance ratio. For the period in which the pro…
An X-ray survey in SA 57 with XMM-Newton
Fiore, F.; Puccetti, S.; Trevese, D. +3 more
Context: The maximum number density of Active Galactic Nuclei (AGNs), as deduced from X-ray studies, occurs at z ⪉ 1, with lower luminosity objects peaking at smaller redshifts. Optical studies lead to a different evolutionary behaviour, with a number density peaking at z ≈ 2 independently of the intrinsic luminosity, but this result is limited to…
Conversations on the Habitability of Worlds: The Importance of Volatiles
Bertaux, J. -L.; Carr, M.; Gaidos, E. +1 more
Our scientific forefathers discuss the interrelationships between water, climate, the atmosphere, and life on Earth and other terrestrial planets at a workshop in Nichtchâtel, Switzerland.