... Stotskii A. A. Path length fluctuations through the Earth troposphere: turbulent model and data of observations. The spatial and temporal structure functions of path length the Earth troposphere for the whole space and time ranges constructed on the base of turbulence theory are considered. These structure functions include three domains: a power law of 5/3 (three-dimensional turbulence), a power law of 2/3 (two-dimensional turbulence) and saturation. ...

... The plotter allows various annotations (lines, arrows, text and ``spans'') to be added to the plot. ... The values are in world coordinates. ... axhline(y, xmin, xmax) . ... avhline(x, ymin, ymax) . ... xmin, xmax) . Overlay a transparent colour rectangle. ymin and ymax are given in world coordinates while xmin and xmax are given in relative coordinates . ... Overlay a transparent colour rectangle. ymin and ymax are given in relative coordinates while xmin and xmax are given in world coordinates . ...

... Stonehenge consists of large carved stones assembled about 4000 years ago. ... Two years ago, it provided spectacular pictures as it neared its closest approach to the Sun. ... In astronomical parlance, an interior planet is at superior conjunction when it is located on the opposite side of the Sun from Earth. ... Orbiting closer to the Sun than planet Earth, bright Venus always appears to be near the Sun's position in our sky and often shines near the horizon in twilight hours. ...

... Project D - Constructing HR Diagrams for Star Clusters out to Virgo . ... Staff Directory . ... Hubble Heritage Project . ... Research Staff Directory . ... Colloquia . ... Events . ... Youth for Astronomy and Engineering . ... Directory . ... Science Projects . ... Engineering Technology Colloquia . ... Media Events . ... Population synthesis studies promise an independent story of time evolution if we can reach the main sequence in Virgo. ...

... 2001 November 11 . An Annotated Leonid . ... Explanation: The 1998 Leonids Meteor Shower was one of the most photographed meteor events in history. Patient observers saw bright meteors streak across dark skies every few minutes, frequently leaving fading trails stretching across the sky. ... The intensity of the Leonid Meteor Shower in 2001 is uncertain but may approach one per second for some locations on November 18. ... About APOD | ... NASA Technical Rep.: ...

... The radio to X-ray continuum shape of quasars (gif), (Elvis et al., ... Plotted in log nufnu vs log nu (nu=frequency) space. ... Radio-loud, Radio-quiet: quasars that look virtually identical at all other wavelengths can differ by a 1000 in their radio emission. Radio-loud quasars have a powerful jet moving at relativistic speeds (i.e. close to the speed of light) made up of energetic particles, themselves moving near the speed of light in a magnetic field. ...

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Chair of solid state physics . ... The Physics of Phonons . ... In the first part of the course “The Physics of Phonons” the dynamics of atoms in one- and three- dimensional crystalline lattices is considered in detail. The quasiparticle conception in solids, taking phonons as an example, is discussed; creation and annihilation operators of phonons, main properties of acoustic and optical phonons dispersion laws, density of phonon states. ... Crystalline state. ... Acoustic and optical phonons. ...

Main Page Data Structures File List Data Fields Globals . Here are the data structures with brief descriptions: . element . Array element . oi_array . Data for OI_ARRAY FITS table . oi_t3 . Data for OI_T3 FITS table . oi_t3_record . Triple product record . oi_target . Data for OI_TARGET FITS table . ... Data for OI_VIS FITS table . ... Data for OI_VIS2 FITS table . oi_vis2_record . Visibility squared record . ... Data for OI_WAVELENGTH FITS table . ...

... On the modeling of the late optical afterglows from cosmological gamma-ray-bursts . Interaction of cosmological gamma-ray burst radiation with the dense interstellar medium of host galaxy is researched. Gas dynamical motion of interstellar medium driven by gamma-ray burst is investigated in 2D approximation for different initial density distributions of host galaxy matter and different total energy of gamma-ray burst. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. November 11, 1997 . The Annotated Galactic Center . ... Constellations of nearby stars include Sagittarius , Libra , Scorpius , Scutum , and Ophiuchus . ... Open clusters include M6 , M7 , M18 , M21 , M23 , M24 , M25 . Globular clusters include M9 , M22 , M28 , M54 , M69 , M70 . ... About APOD > . ... NASA Technical Rep.: ...

... We describe a simple method to annotate shell scripts and have a preprocessor extract a set of variables, present them to the user in a GUI (using Tcl/Tk) with context sensitive help, and run the script. ... When individual applications are (tightly) integrated into the scripting language, this offers very powerful scripts, fully graphical user interfaces and a result sometimes indistinguishable from applications. ... Here is an example header from a C-shell script with which Figure 1 was made. ...