... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

Geomagnetic disturbances can be monitored by ground-based magnetic observatories recording the three magnetic field components. The global Kp index is obtained as the mean value of the disturbance levels in the two horizontal field components, observed at 13 selected, subauroral stations . ... Geomagnetic activity is the occurrence of K variations. ... But K still remains a local index, describing disturbances in the vicinity of each observatory. ...

Interactions and star formation activity in Wolf-Rayet galaxies ґ Angel R. Lґ ez-Sґ hez1 and Cґ op anc esar Esteban 1 2 2 CSIRO ATNF, Australia Angel.Lopez-Sanchez@csiro.au Instituto de Astrofґ isica de Canarias, Spain, cel@iac.es We present some global results of the PhD Thesis carried out by Lґ ezop Sґ hez (2006), in which a detailed morphological, photometrical and spectrosanc copical analysis of a sample of 20 Wolf-Rayet (WR) galaxies was realized. ...

Geomagnetic storms and substorms are a natural hazard similar to hurricanes, floods etc. ... Solar and geomagnetic activity also probably influences the Earth's climate and human health. ... Under southward directed IMF the Earth's magnetosphere is open to input from the solar wind flow. ... Since practical importance of solar wind measurements was recognized, a number of approaches was developed for prediction of the geomagnetic activity basing on the solar wind data. ...

... Main topics of investigation in that p eriod were comparison and combination of catalogues of radio source p ositions, analysis of VLBI EOP series, analysis of radio source p osition and zenith trop osphere delay time series. ... Julia Sokolova (100%) -- global data analysis for deriving radio source catalogues and p osition time series, comparison and combination of radio source catalogues, time series analysis, development of algorithms and software for CRF studies; 3. ... 2007, 474, No. ...

. We give a review of some expander constructions using error-correcting codes and group algebras. We show that applying these constructions to properly choosed codes on modular curves one obtains some new intersting expander graphs. Go to the Laboratoire Poncelet home page. Site design by Paul Zinn-Justin

The IAA RAS . ... View details . ... Observatories 'Svetloe' and 'Zelenchukskaya' participate in frequent VLBI-observation sessions organized by the International VLBI Service for Geodesy and Astrometry . ... As part of collaboration with the U. S. Naval observatory in the areas of EOP determination and analysis the USNO uses IAA RAS daily EOP data obtained from SLR and VLBI. ... The IAA RAS and the Centre National d'Etudes Spatiales carry out joint DORIS observations on the Badary observatory. ...

... In collaborative work with David Garc?a Alvarez (an Observatory PhD student now at Harvard) and John Butler, an extensive study of the RS CVn binary HR1099 was completed leading to two papers; the first on Doppler imaging and the second on flare activity. Spectra for the Doppler imaging were taken at two different sites, Kitt Peak National Observatory (KPNO), Arizona, and Mount Stromlo Observatory (MSO), Australia, during the 1998 MUltiSIte COntinuous Spectroscopic (MUSICOS) campaign. ...

HUBBLE SPACE TELESCOPE DAILY REPORT #1966 PERIOD COVERED: 0000Z (UTC) 09/18/97 - 0000Z (UTC) 09/19/97 Daily Status Report as of 262/0000Z 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed Three Sets of WF/PC-2 7621 (WF/PC-2 Cycle 7 Supplemental Darks PT1/3) The WF/PC-2 was used to make supplemental dark calibration images. ... The observations were executed as scheduled, and no anomalies were noted. ... The observations were completed as scheduled, and no problems were reported. ...

... The Sun has come all of one day away from breaking its record for the longest period of inactivity for the last decade - reaching a mid-summer low and falling into yet another state of "hibernation". Yesterday, on the first day of autumn, new sunspots appeared on the surface of the Sun following an absence of almost 50 days. ... The first low lasted 51 days, from 21 July until 11 September last year. ... Now, almost a year later, it seems the Sun has hit a new low almost as "deep" as the first. ...

home education > activities . ... This activity is mostly just calculations, but students will enjoy figuring out the angle by which an asteroid headed for Earth needs to be deflected to miss our planet.[h] . ... Students are encouraged to play out the motion and positions of a comet and the Earth, relative to the Sun. ... Cute little activity in which younger students "interview" the Sun as a way of encouraging them to research various topics on the Stanford Solar Center web site. [e] . ...

Next: Principles of organization Up: Further advance in the Previous: Further advance in the . ... An ability of using different catalogs makes this problem considerably simpler. Lately Different attempts have been made for combining many astronomical catalogs in unified databases NED, SIMBAD, ESIS, ADS, etc.(see reviews by Andernach et al.1994; Andernach 1995). ... We propose a new solution to this problem with a ``CATalogs supporting System'' (CATS) at Special Astrophysical Observatory (SAO). ...

... Three day radio-astronomical forecast of the proton activity of the Sun: The figure shows multiwave radio emission scans - graphs of the distribution of intensity I and circular polarization V across the solar disk, obtained at RATAN-600. ... According to this criterion, for a proton flare to arise, the flux of radio emission must be sufficiently high at short wavelengths (blue color scans) and should increase with time compared to the general intensity. ... More about the solar activity . ...

... Using multifrequency radio data obtained with the GMRT, VLA and RT, we are defining a sample of young radio AGN in the Spitzer FLS field which are associated with midinfrared sources. ... GMRT Observations The Spitzer extragalactic First Look Survey (FLS) field was observed with the Giant Metrewave Radio Telescope (GMRT, Figure 1), Pune, India, at 610 MHz in March 2004. ... Figure 1: Three of the antennas in the inner square kilometre of the Giant Metrewave Radio Telescope (GMRT). ...

... Dept. for Physics of Planetary Systems . ... Laser station . ... Built a network of laser stations (LLS), radio (GNSS) satellites and observation radiointerferometrychnyh observations of quasars (VLBI) ( YA.S. Yatskiv, Medvedsky MM, AA Pace, EE Volvach, YL Kokurin in collaboration with workers in other entities) . ... БЂў Laser station observation satellites is the global network of service stations of the International Earth rotation and conducts active surveillance for international programs. ...

... disappearance/eruption of the filament accompanied by a number of large-scale dynamic phenomena (a coronal wave, chain, CME, arcade) Yohkoh/SXT . H-alpha and Yohkoh/SXT . ... SOHO/EIT (DelaboudiniХre et al., 1995) images and movies; . ... Preceding activity SOHO/EIT, 195 A (10-22 UT) (Figure 3) . ... SOHO/EIT, 171 A (Figure 4) MLSO/HAO H-alpha and He I 10830 A (Figure 5) MLSO/HAO, He I 10830 A . ... SOHO/EIT, 171 A (Figure 4) SOHO/EIT (171, 195, 284, 304 A) Dec 29, 1999 (Figure 10) . ...

RADIOASTROPHYSICAL DEPARTMENT • INSTITUTE OF SOLAR-TERRESTRIAL PHYSICS RAS SB . General information Main characteristics of the Radio telescope Observing programs General view of the antenna array Main research areas Principle of generation of radio images Radio telescope 's beam Receiving systems Main characteristics of the base receiving-recording complex Calibrations Data archive and databases Publication SSRT - Siberian Solar Radio Telescope . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2015 September 20 . Global Ocean Suspected on Saturn's Enceladus . Image Credit: Cassini Imaging Team , SSI , JPL , ESA , NASA . ... The magnitude of Enceladus' wobble as it orbits Saturn might indicate damping by a globally extending underground ocean layer . Set to Music: APOD images from August 2015 . ... About APOD | ...

... Global Ocean Suspected on Saturns Enceladus . ... 20.09.2015 . ... Credit Copyright: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: Do some surface features on Enceladus roll like a conveyor belt? ... Inspection of these images show clear tectonic displacements where large portions of the surface all appear to move all in one direction. ... The small magnitude of Enceladus' wobble as it orbits Saturn might indicate damping by a globally extending underground ocean layer . ... 2015 2016 ....

SDSS CONSTRUCTION ACTIVITIES . ... Construction Punch List: December 27, 1999 . Detail Views of Roof Attachments: December 22, 1999 . ... HVAC and Hoist Work: December 13, 1999 . Moving the Loft: December 6, 1999 . ... Quick Shots of Loft Installation: December 6, 1999 . ... Loft Preparation for Installation: December 1, 1999 . Moving Loft for Prep Work: November 29, 1999 . ... Construction Tarp Installation; Part 2: November 5, 1999 . ... HVAC Installation; Part 3: October 7, 1999 . ...