The ATMOS Fourier transform spectrometer was flown for a fourth time on the Space Shuttle as part of the ATLAS-3 instrument payload in November 1994. More than 190 sunrise and sunset occultation events provided measurements of more than 30 atmospheric trace gases at latitudes 3 49øN and 65 72øS, including observations both inside and outside the Antarctic polar vortex. The instrument configurat...

ECMWF plans to start assimilating GPS radio occultation measurements with a two dimensional (2D) bending angle operator in 2014. We will describe the new operator, and explain how it has been implemented on the parallel computing system. Issues relating to the computational cost of the operator will be discussed, and a new hybrid approach using a 2D operator in the 4D-Var outer-loop and a 1D op...

Context. 55 Cnc e is in a 0.73 day orbit transiting Sun-like star. It has been observed that the occultation depth of this super-Earth, with mass 8 M ? and radius 2 R , changes significantly over time at mid-infrared wavelengths. Observations Spitzer measured change its day-side brightness temperature 1200 K, possibly driven by volcanic activity, magnetic star-planet interaction, or presence ci...

Halogen Occultation Experiment (HALOE) and balloon-borne in situ measurements of methane in stratosphere and their relation to the quasi-biennial oscillation (QBO) P. K. Patra, S. Lal, S. Venkataramani, and D. Chand Frontier Research System for Global Change, Yokohama 236 0001, Japan Physical Research Laboratory, Ahmedabad 380 009, India Max Planck Institute for Chemistry, 55020 Mainz, Germany ...

The Mariner IV Occultation Experiment (Ref. 2) has been carried out by investigators from the Jet Propulsion Laboratory, Stanford University, and CorneU University. Previous knowledge of such atmospheric properties as the surface pressure and density, as well as scale height, has been quite poorly defined. The surface pressure, as deduced from recent spectroscopic observations of weak and stron...

ABSTRACT Recording a stellar occultation is one powerful method that gives direct information about the physical properties of occulting Solar system object. In order to obtain reliable and accurate results, simultaneous observations from different locations across-track projected path are great importance. However, organizing all observing stations, aggregating, analysing data time-consuming n...