... Sunspot Metamorphosis: From Bottom to Top . ... Credit Copyright: Dutch Open Telescope , Sterrekundig Instituut Utrecht Explanation: Sunspots -- magnets the size of the Earth -- are normally seen flat on the Sun. ... Here magnetic field lines can be clearly followed outward from the sunspot to distant regions. ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: sunspot - Sun - magnetic field . Publications with words: sunspot - Sun - magnetic field . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2005 February 16 . Sunspot Metamorphosis: From Bottom to Top . ... Explanation: Sunspots -- magnets the size of the Earth -- are normally seen flat on the Sun. ... The large dark sunspot sports a clear dark umbra in the center surrounded by a lighter penumbra. ... About APOD | ... NASA Web Site Statements, Warnings, and Disclaimers . ...

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

... We have simulated the observations of a very distant cluster of galaxies at high redshift. ... The simulations are made for the HST instruments FOC, WFPC II, and the Advanced Camera, and for an 8-m telescope on the ground equipped with adaptive optics. ... A comparison of the fields of view of post-COSTAR HST imaging instruments with the Advanced Camera (AC) and the ground-based adaptive optics camera (AO) is shown in Fig. 1 superimposed on the noise-free cluster simulation. ...

home publications > mercury . SEARCH ASP SITE: Match ALL words Match ANY word . ... ASP Conference Series . Monograph Publications . IAU Publications . ... Publications of the ASP (PASP) . ... Mercury Magazine . ... Order Mercury Issues . ... Astronomy Beat . ... Mercury Magazine Contents and Select Excerpts . ... January/February 2006 . ... Deadly Cosmic Storms, Jennifer Birriel and Ignacio Birriel . ... Sky Events, Richard Talcott . January Sky Map | February Sky Map | ...

... The TRACE images may be used without restrictions in publications of any kind. ... These two images, taken on 18 November 2000 at 15:54UT and 16:11UT, respectively, show such an event: the red circle in the image to the left shows a region where many loops are cooling, with bright loop tops (the intensity scales with the square root of the image to reduce the dynamic range). ... See also a collection of images related to the Sun, other cool stars, and solar-terrestrial effects . ... Images | ...

... The active time at each angular bin is the sum over frames of the active time contributions from all CCD pixels, within the node-specific telemetry window, which overlap the surface of the bin. ... The active time, per frame, of a normal pixel is the full frame integration time multiplied by the node-specific fractional exposure; bad pixels contribute no active time. ... If an event is rejected for this reason only, then its pixels remain normal in the exposure map. ...

... We use the first XMM serendipitous source catalogue (1XMM) to compile a sample of normal X-ray galaxies . ... We combine our emission line sample with earlier works forming the most comprehensive X-ray selected galaxy sample for the study of the X-ray luminosity to the H? luminosity - a well-calibrated star-formation indicator - relation. ... We find that the X-ray luminosity strongly correlates with the H? luminosity, suggesting that the X-rays efficiently trace the star-formation. | ...

This diagram illustrates the normal flow of text between parent and sibling boxes. A document window is shown, with 8 lines (numbered 1 to 8), each 24px high. Four lines of text are displayed, occupying line 1 through 4. In the following PRE element, each 24 pixel line is simulated by two lines, the second beginning with the appropriate number. The lines, as they appear in the image, contain: 1 Beginning of body contents. ... 3 End of outer contents. End of body 4 contents. ...

... Laboratory for Spectroscopy of Molecular Structures . ... News . ... A new article entitled Description of optical properties of cholesteric photonic liquid crystals based on Maxwell equations and Kramers-Kronig relations has appeared in Physical Review E. Congratulations to Grigoriy Ksyonz on his first publication! . 25 th February 2013 . ... 22 nd November 2012 . ... 22 nd February 2012 . 4 th Workshop on Liquid Crystals for Photonics 2012 will take place in Hong Kong December 9-11, 2012. ...

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Dept. of Mathematical Logic and Theory of Algorithms, Faculty of Mechanics and Mathematics, Moscow State University, Moscow, 119899 Russia. ... Computational complexity, Kolmogorov complexity . Program committee member of 18th IEEE Conference on Computational Complexity, 2003, Aarhus (Denmark) and of . 18th International Symposium on Theoretical Aspects of Computer Science, 2001, Dresden (Germany). 2004 . ... Conference on Logical Foundations of Computer Science. ... Elements of Set Theory. ...

... The HI - Star Formation Connection . ... Coffee . ... Dark Galaxies and Dark Matter . ... HI in Normal Galaxies . HI and Galaxy Evolution over Cosmic Time . ... How Galaxies Accrete Gas . ... The Billion Galaxy Survey . ... Searches for Dark Galaxies . ... Evidence for Dark Matter in Galaxies . HI in Galaxies: Overview . ... Open Questions in Normal Galaxies . ... Starburst galaxies and BCDs . ... HI Rich Galaxies . ... Open Questions in HI and Galaxy Evolution . HI and Galaxy Evolution . ...

Next: Main-sequence stars (stage I) Up: Evolutionary Scenarios of Binary Previous: Evolutionary Scenarios of Binary . We begin with a description of normal star evolution. The evolutionary states of normal stars will be written using roman figures (I-IV), whereas those of compact stars will be denoted by capital letters (E, P, A, SA ...) (see Section  4 ). ... a main-sequence (MS) star inside its Roche lobe   (RL); . ... a post-MS star inside its RL; . ... Main-sequence stars (stage I) . ...

... Circles are chemically normal stars, squares are Boo stars, the diamond is the possible Bp star V380 Ori A. Open symbols are stars with confirmed magnetic field detections. ... The photospheres of about 10-20% of main sequence A- and B-type stars exhibit a wide range of chemical peculiarities, often associated with the presence of a magnetic field. ... The incidence of Boo chemical peculiarities we find in Herbig stars is much higher than what is seen on the main sequence. ...

... Circumstellar disc of beta Pictoris: constraints on grain properties from polarization. To appear in the Astronomy & Astrophysics . abs , src , ps ] . ... Dust influx to Titan from Hyperion . ... abs ] . ... Characteristics of bulges and disks in interacting galaxies . ... Dust grains around Herbig Ae/Be stars: porous, cometary-like grains? ... To appear in the Astronomy & Astrophysics Supplement . ... Finally, Links may lead you to more options (e.g. via the LANL preprint system). ...

... GSAOI Home . ... Science . ... The goal of this project is to detect the termination of the white dwarf cooling sequence in nearby open star clusters, and hence derive cluster ages that are independent of the normal main sequence turnoff method. ... The potential for accurate proper motion measurements, i.e., measurements of transverse motion across the sky, with GSAOI offers a means of overcoming this difficulty. ...

We cannot observe the way the distant universe accelerates cosmic rays or produces energetic photons, but acceleration processes also occur on our Sun , though on a much more moderate scale. ... That is why such events are often missed by cosmic ray detectors near the equator, where the lowest energies are excluded by the Earth's magnetic field. The best detectors for observing solar particles are therefore those sensitive to the lowest energies of the cosmic radiation. ...

... 1995: . ... for the first time a magnetic field was registered on normal white dwarfs. ... A study of variability of the first galactic superluminal radio source GRO J1915 +10 with the RATAN-600 showed a delay of flare activity at 3 frequencies of 5-10 days after the X-ray flares with an inversion of the radio spectrum. ... The distribution of linear dimensions of clouds in the first approximation is power-law. The distribution of clouds by concentrations depends on the galactic latitude. ...

. Subdwarfs . Metal deficient red giants in galactic field . Red horizontal branch stars . Blue horizontal branch stars . Extended horizontal branch stars . Stars inside globular clusters . W Vir type stars . IRAS-sources identified with peculiar supergiants . RCrB type stars . Sakurai's object . peculiar supergiant FG Sge .