This is then compared with the frequency of the emitted light pulses. ALADIN LITE - Below you can scroll your mouse over the image zoom, or search ALADIN LITE which uses Aladin sky atlas developed at CDS, Strasbourg Observatory. Two optical receivers measure the frequency of the light backscattered along the instrument line of sight by molecules ('Rayleigh signal'), and particles, ice crystals and water droplets ('Mie signal'). ![]() Through the coordinates in basic data, you can query around an object, using a provided radius. In this way, it is possible to determine the wind at various altitudes above the surface. Links to the other CDS services: Tables in VizieR, giving access to the whole catalogued data, links to Aladin images, surveys and observatory logs. all AAS Journals since 1997 on our Astronomy Image Explorer (AIE) tool. The receiver analyses the Doppler shift of the backscattered signal with respect to the frequency of the transmitted laser pulse and as a function of time. which is available in some astronomy software tools such as AIPS or Aladin. This allows ALADIN to determine the east-west horizontal component of the wind along most of its orbit around the Earth. The lidar is aimed 35° from nadir and 90° to the satellite track (on the side away from the Sun), in order to transmit and receive light perpendicular to the speed of the satellite. ![]() The Atmospheric Laser Doppler Instrument (ALADIN), onboard the Aeolus mission, is a Direct Detection Doppler Wind Lidar operating in the ultra-violet spectral region (355 nm).
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