RATAN-600 Radiometer = 31 cm . ... 0.96 GHz . ... Band pass Filter . ... Front end amplifier . ... System noise temperature . ... Noise Added Radiometer . ... Polarization . Left Circular Polarization ( LCP ) . or Right Circular Polarization ( RCP ) . Feed . Three-frequency feed with . ... Calibration . Noise generator . Simplified block-diagram of the radiometer . PF - primary feed, . ... NG1 - noise generator for calibration, . NG2 - balance noise generator, . ...

Measure Tsys with a calibration diode. Diode power injected via a directional coupler before the first amplifier. ... Turning the diode on and off gives Tsys in Units of the diode temperature. ... All drifts in electronic gain can be removed with the cal diode (assuming the diode is stable). Gain drift and correction Examples: . No cal correction: . ... Dotted line is 5% change in Tsys. total power with cal correction (.pdf) . ... Measure diode temperature using hot and cold loads . ...

... HST . ... Missions . ... Data . ... Hubble Heritage Project . Future Missions and . ... HST Overview . Overview . ... Phase I Proposing . ... Cycle 24 Announcement . ... Phase II Cycle 23 . ... Retrieving HST Data . ... NOTE: This tool creates darks for data taken BEFORE January 4, 1999! These darks will not properly calibrate any data taken during Cycle 11 and beyond. A web-based tool to generate temperature-dependent dark current reference files for MULTIACCUM data is now available. ...

... Because of the Sun 's UV radiation, Earth 's upper atmosphere is partly (0.1% or less) ionized plasma at altitudes of 70-1500 km. ... Around the plasma density maximum (F-layer, see below) a so-called ionospheric waveguide is formed for magnetosonic waves . ... It is interesting to note that this works also the other way round and, for example, the auroral kilometric radiation created by the precipitating particles high above the ionosphere does not reach the ground because of the ionospheric E...

ATCA 12mm System and SNRs 12mm systems currently installed on CA02, CA03 and CA04 Available frequency ranges 16.1- 18.9 GHz and 20.1- 22.5 GHz (Requires module swap to change bands) At conclusion of MNRF I : · 12mm on all six CA antennas · Maximum baseline 6 km · 16.0 ­ 26.0 GHz (May term 2003) Measured System Temperature Polarisations A and B on CA03 at zenith Atmospheric antenna temperature and opacity Most vary in flux density, some resolved on long baselines. ...

Space Radio Telescope . The space radio telescope antenna consists of a deployable parabolic reflector (10-m diameter) which is made of 27 carbon fiber petals and central solid portion (3 m in diameter). The radio telescope has focus to diameter ratio F/D=0.43 and overall RMS surface accuracy 0.7 mm. ... A concentric feed arrangement at prime focus will provide the possibility of observing at two frequencies or two circular polarizations simultaneously. ... Observing frequency (MHz) . ...

Some Effects of Earthquakes, Temperature, Wind Stor ms and Barometric Pressure on the Inter ferometer at Hanford Robert Schofield Masahiro Ito Rauha Rahkola Evan Mauceli Ray Frey David Strom Jim Brau University of Oregon Some Concerns With Low Frequency Influences · Loss of lock · Need for increased servo loop gain · May eat up actuator range · Possible increased background in the LIGO frequency band · Possible modulation of noise in the LIGO band Guralp ...

Cold-Electron Bolometer Arrays for THz Detection Leonid S. Kuzmin b , Mikhail A. Tarasovc,d, , Sumedh H. Mahashabdea, and Valerian S.Edelmane, Chalmers University of Technology ... Electronics, Moscow, Russia c P.Kapitza Institute for Physical Problems, Moscow, Russia a a,b,c Abstract-- Various concepts of Cold-Electron Bolometer (CEB) Arrays are considered for THz detection from 300 GHz to 7 THz ... Optical response to THz radiation is 300 µV for 2.7/0.3 K temperature difference. ...

Next: Pressure Up: Additional information Previous: Additional information . ... Although the ESO Archive standard is to record temperatures in kelvins, this is often inconvenient. ... Therefore, if the temperatures are not in kelvins, the appropriate units should be provided in the table file (if temperatures are in a column), or as a comment. ... If filter and detector temperatures are otherwise regulated or recorded, it may still be useful to record DOMETEMP in the data file as a Real*4 column. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... A sketch for the active region model on ultracool dwarfs. ... An active region model was built, based on the rotation of the UCD and the ECMI mechanism. ... The active region model is applied to the radio emission from TVLM 513-46546, in which the ECMI mechanism is responsible for the radio bursts from the magnetic tubes and the rotation of the dwarf can modulate the integral of flux with respect to time. ...