... HST . ... Missions . ... Data . ... Future Missions and . ... Missions Office . ... HST Peer Review Process . ... HST Overview . Overview . ... Servicing Missions . Phase I Proposing . ... Cycle 24 Announcement . Cycle 23 Results . ... Phase II Cycle 23 . ... Retrieving HST Data . ... Target Acquisition Reference Information . Table 7.3 on page 98 lists the effective areas of the four acquisition mirrors (in cm2) as a function of wavelength, to use to predict acquisition count rates. ...

The Behaviour of the XMM­Newton Background: From the beginning of the mission until January 2008 XMM-SOC-USR-TN-0014 issue 2.0 P.M. Ro drґ iguez­Pascual and R. Gonzґ alez­Riestra XMM­SOC User Supp ort Group March 3, 2008 1 Intro duction This do cument sup ersedes XMM-SOC-USR-TN-0014, issue 1.0. ... For this purpose we have examined the background in RGS1 and EPIC­pn science observations taken from the beginning of the mission until January 2008. ... RGS1 is shown in black and EPIC­pn in red. ...

ALMA | ... In this section, we explain why we need to correct phase fluctuations and ALMA's strategy to do this. Rapid fluctuations will be corrected with water vapour radiometers (WVRs). The Cavendish Astrophysics Group was also a leading contributor to the ALMA prototype WVRs, which were put through their paces in tests at the Submillimeter Array (SMA). ... The Cavendish Astrophysics Group in partnership with the Onsala Space Observatory built two prototype WVRs for the ALMA project. ...

... 2000 December 30 . A Year of Resolving Backgrounds . ... Explanation: No matter which direction you look, no matter what type of light you see, the sky glows - but why? ... In microwave light , the BOOMERANG and MAXIMA-1 missions resolved with new clarity the seemingly uniform microwave background . ... Pictured above , a map spanning ten degrees of the microwave sky resolves the microwave background into hot and cold spots, as indicated in micro kelvins . ... About APOD | ...

... European Remote Sensing Satellite (ERS-1) was launched on 17 July 1991, and the follow mission ERS-2 (with the same sensors and an Ozone monitoring instrument added) was launched on 21 April 1995. ... ERS-2 has a fixed repeat cycle of 35 days, and follows ERS-1 tracks with one day's delay. ... Swath width is 102.5 km (telemetered), spatial resolution is about 25x25 m. The Advanced SAR (ASAR) instrument is carried by ESA's ENVISAT satellite launched on 1 March 2002. ... Swath . ... Spatial Resolution...

Next: The Scenario Machine: Operational Up: Evolution of Magnetic Rotators Previous: Ejector-propeller hysteresis . ... The length of this segment is determined by the eccentricity. ... In this case no hysteresis occurs and transitions E -- P and the reverse take place in symmetrical points of the orbit. ... Here EP means a mixed state of the rotator at which it is in the ejector state during one part of the orbit, and in the propeller state during the rest of the orbital cycle. ...

... This noise can be reduced by replacing the pixels with an average of the surrounding values using a linear filter. ... The effects of applying linear filters to a CCD frame is shown in Figure . Figure: Different digital filters applied on a CCD image: (A) original, (B) block filter, (C) smooth filter, and (D) Laplacian filter. ... To remove stellar images from a picture of comet Halley, the results of applying different non--linear filters to the frame are given in Figure . ...

Use procedure average to average point data. ... Warning(AVERAGE): no BackgndRate for OB=1, CH=11, scan= 1, Star: BSC1788 . ... Important : before beginning with the calibration, it is necessary to flag all incoherent scans since they are no longer needed. ... Begin calibration by displaying the plot widgets for averaged visibility data using Calibrate|Visibility|PLOT. ... Plot this selection of visibility amplitudes on baseline 1 of both spectrometers, for the four selected channels. ...

... Matching the Surface of Best Focus . ... The plug-plates of SDSS project are responsible for locating the optical-fiber plugs spatially and for defining the plug tilt with respect to the surface of best focus. ... Approximately 670 holes are drilled in each plate. ... In the first attempts to match the curvature of the plug-plates to that of the best focal surface, the bending fixture was set upon 3 6.630mm metal supports that were affixed to a table top and spaced 120 apart. ...

... Variations in water level along coastlines can be used to drive turbines technology is the same as low-head hydro power . ... Intermittent tidal flow is major problem. Tidal facility produces about 1/3 the electrical energy of a hydro facility of the same peak capacity . Two tidal plants in the world: . ... Bottom Line: There aren't many favorable sites in the world for tidal power and the estimated capacity is 50 times smaller than the world's hydroelectric power capacity. ...