... Unknown Dark Material on Mercury . ... Credit: MESSENGER , NASA , JHU APL , CIW Explanation: What is that strange material on Mercury? ... Pictured above on the lower right, a large crater -- about 100 kilometers across -- has unusual dark material of unknown composition near its center. ... One origin hypothesis is that the dark material was uncovered from beneath Mercury's surface during the impact that created the surrounding crater. ... Publications with keywords: Mercury - Messenger . ...

spaceweb@oulu.fi - last update: 4 September 1998, 0830 UT (RR) . ... This World Wide Web service is a work in progress by the Space Physics Group of Oulu , which also owns the copyright. The material is published for free Internet access, which includes printing and downloading of the text for your own personal use. However, for redistribution of the material, the users are requested to contact the authors of the group (note that this address is preferred over the individual addresses below). ...

We would like to announce the release of Version 3.02 of the CHIANTI database for astrophysical spectroscopy. This now extends the database to include the 1 - 50 wavelength region. The additions to the database are described in a paper `CHIANTI - an atomic database for emission lines, IV - Extension to X-ray Wavelengths' by K.P. Dere, E. Landi, G. Del Zanna, and P.R. Young and accepted for publication by the Astrophysical Journal Supplement Series. ... Atomic Data Updates (April 30, 2001) . ...

... The task calculates an average RMF over the spatial region used to extract the source spectrum. ... Essentially a grid is placed over the source region and the redistribution parameters calculated at each point. ... By means of command line parameters the averaging may be performed assuming that the flux distribution is that of the point spread function (PSF), a flat uniform distribution or it may be defined explicitly by supplying the task with an image containing the source region. ...

... The optical spectrum of the infrared source IRAS04296+3429 (optical counterpart - G0Ia star, V=14.2) was obtained with the echelle spectrometer PFES at the prime focus of the 6m telescope. ... 1995, Szczerba et al. 1996), our detailed modelling of its spectral energy distribution suggested that this source also should show the 30 m band. ... Stars: abundances - Stars: atmospheres - Stars: AGB and post-AGB - Stars: individual: IRAS04296+3429 . ... Spectral energy distribution . ...

... Russian Academy of Sciences, Department of Physical Sciences , Project number . ... Bicrystal junction and heterostructures made of cuprate oxide material with strong correlated electrons will be investigated. ... DC, microwave and noise properties of the junction will be investigated. ... To investigate noise spectral density in oxide superconducting bicrystal junction. ... To develop new type of bicrystal junction with misorientation of c axes around the basic plane axes. ...

Wave propagation in an irregular plasma . Methods of the ionospheric plasma radio sounding . ... Program, Grant No. ... Investigation of Anomalous Attenuation Effect Caused by Radio Wave Scattering and Transformation on the Ionospheric Irregularities . ... Grant No. ... Diagnostics of Ionospheric Irregularity Spectrum Using Measurements of Radio Wave Anomalous Attenuation Under Vertical Sounding . ... Simple numerical model of radio wave multiple scattering effects in the ionospheric plasma layer. ...

Magnetic Fields around Radio Galaxies Robert Laing (ESO) Laing et al. ... 2008) Negligible depolarization and 2 rotation Almost all Faraday effects must be due to foreground material How to fit depolarization caused by foreground Faraday rotation Complex polarization Rotation measure Integrate over a beam Observed RM for 0 2 rotation and depolarization Faraday rotation and depolarization 5.5 arcsec FWHM Faraday effects at high resolution FWHM = 1.5 ...

This annotated artistтАЩs impression shows the Milky Way Galaxy. The blue halo of material surrounding the galaxy indicates the expected distribution of the mysterious dark matter. New measurements based on the movements of stars show that the amount of dark matter in this region around the Sun is far smaller than predicted and have indicated that there is no significant dark matter at all in our neighborhood. ...

... Black dotted squares with digital inside represent brightening events studied in the paper. ... The contours draw the coronal hole boundaries. ... 2007 (X-ray bright point in coronal hole. ... 2007 (X-ray bright point in coronal hole, which shows a clear example of magnetic flux emergence. ... 2007 (X-ray jet in coronal hole. ... gif (81 MB) . ... jpeg . ... pdf . ... In some movies, there is a black square on magnetograms in order to highlight the region associated with the brightening event. ...

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