نتایج جستجو برای: occultation
تعداد نتایج: 1773 فیلتر نتایج به سال:
We present and characterize the performance of a new remote sensing concept extrapolated from the GPS occultation concept in which we choose the signal frequencies to determine profiles of atmospheric water, ozone, temperature, geopotential of atmospheric pressure surfaces and clouds.
Introduction: The Moon is a unique location for experimental astrophysics. It’s dense regolith and lack of an appreciable atmosphere are just two of the characteristics that can be brought to bare on the challenges of high-energy astrophysics. The Lunar Occultation Observer (LOCO) is a new γ-ray astrophysics mission concept expected to have unprecedented sensitivity in the nuclear regime (~0.02...
We report on the detection of infrared light from the super-Earth 55Cnc e, based on four occultations obtained with Warm Spitzer at 4.5μm. Our data analysis consists of a two-part process. In a first step, we perform individual analyses of each dataset and compare several baseline models to optimally account for the systematics affecting each lightcurve. We apply independent photometric correct...
Space based GPS measurements onboard Low Earth Orbiting (LEO) satellites provide a uniquepossibility for exploring the ionosphere on a global scale. Both the radio occultation measurements in thelimb sounding mode and the navigation measurements using a zenith viewing GPS antenna provide theTotal Electron Content (TEC) along numerous ray paths. TEC may effectively be used for re...
GPS radio occultation events observed between 24 July and 17 November 2008 by the IGOR occultation receiver aboard the TerraSAR-X satellite are processed and analyzed. The comparison of 15 327 refractivity profiles with collocated ECMWF data yield a mean bias between zero and −0.30 % at altitudes between 5 and 30 km. Standard deviations decrease from about 1.4 % at 5 km to about 0.6 % at 10 km ...
Solar occultation in the infrared, part of the Spectoscopy for Investigation of Characteristics of the Atmosphere of Venus (SPICAV) instrument onboard Venus Express, combines an echelle grating spectrometer with an acousto-optic tunable filter (AOTF). It performs solar occultation measurements in the IR region at high spectral resolution. The wavelength range probed allows a detailed chemical i...
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