Radio occultation investigations of the atmosphere of Mars.
Mars atmosphere and ionosphere analyzed by measuring effect on radio occultation of planet, determining shape, atmosphere density profile, diurnal variations, etc
MARS ATMOSPHERE↗
SEARCH · Search NASA
Results for “occultation”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Ground instrumentation for Mariner IV OCCULTATION experiment.
Ground instrumentation system for Mariner IV OCCULTATION experiment, using Doppler frequency perturbation method for Mars atmospheric parameters determination
OCCULTATION↗
Lunar Occultation of 3C 132
Diameter and position of radio source 3C 132 determined by lunar occultation, confirming identification with red galaxy
LUNAR OCCULTATION↗
A database of upper air temperatures from GPS radio-occultations
The launches of the CHAMP, SAC-C, and GRACE spacecraft have started a campaign of dense remote sensing of atmospheric refractivity profiles using GPS radio-occultations of the Earth's atmosphere.
GPS occultations Earth atmosphere middle atmospher↗
A case study of the 2001/2002 winter polar arctic stratosphere as inferred from GPS radio occultations
GPS radio occultations captured by receivers on board the CHAMP and SAC-C spacecraft were used to study the evolution of temperature profiles in the Arctic region north of 65 degrees.
GPS occultations polar stratosphere climate↗
Initial results of combining GPS occultations with ECMWF global analyses within a 1DVar framework
We present results of combining occultation refractivity profiles from GPS/MET with ECMWF global analyses in a 1DVar framework in order to separate the wet and dry contributions to refractivity and assess their impact on the analyzed temperature, surface pressure and specific humidity fields.
Radio occultation positioning system earth atmosph↗
A Technical Description of Atmospheric Sounding by GPS Occultation
In recent years, the Global Positioning System (GPS) has been exploited via radio occultation techniques to obtain profiles of refractivity, temperature, pressure and water vapor in the neutral atmosphere and electron density in the ionosphere.
sensing↗
Applications and Accuracy of Radio Occultation Observations Using GPS
The radio occultation technique has been used to characterize planetary atmospheres since the 1960's spanning atmospheric pressures from several bars to 16 microbars.
radio occultation GPS Earth-orbiter↗
A Generalized Inversion Scheme for GPS Occultation Data Taken by a Receiver Inside or Outside the Atmosphere
We present a generalized raytracing inversion scheme which can be used when the occultation data is taken from within or outside the atmosphere.
GPS Occultation↗
Initial Results of Radio Occultation Observations fo Earth's Atmosphere Using the Global Positioning System (GPS)
None given. Paper deals with radio occultation measurements using the Global Positioning System (GPS).
Global Positioning System GPS radio occultation↗
Morphology of the Solar Corona from Radio Occultation Measurements: Implications for Solar Probe
This paper summarizes the latest results on the morphology of the near-Sun solar wind obtained from radio occultation measurements, and their impact on the planning and conduct of a mission to the Sun such as Solar Probe.
solar corona radio occultation spacecraft radio me↗
Status of the BATSE Enhanced Earth Occultation Analysis Package for Studying Point Sources
The compton Gama-Ray Observatory's Burst and Transient Source Experiment (BATSE) has a powerful capability to provide nearly uninterrupted monitoring in the 25keV--2MeV range of cosmic point sources using occultation by the Earth.
BATSE Compton Observatory cosmic point sources Ear↗
GPS radio occultations coming of age: two spacecraft launches add two new instrumetns for climate monitoring
This paper talks about how 2 spacecraft launches add two new instrumetns for climate monitoring and GPS radio occultations.
GPS occultations Earth atmosphere↗
From BlackJack to GOX: the transfer, test, and validation of the ROCSat-3 GPS occultation receiver
ROCSat-3's primary instrument is the GPS Occultation Receiver (GOX) and is based on the Jet Propulsion Laboratory's (JPL) proven BlackJack GPS Receiver. The COSMIC GOX receivers will demonstrate an important new operational data type for near-real-time assimilation into weather models by providing over 2500 atmospheric profiles per day with a global distribution.
GPS Occultation Receiver↗
Tropical Tropopause Structure and Processes as Observed with GPS Radio Occultation
The vertical temperature structure of the tropical atmosphere has been explained as controlled by the combined effect of three green house gases: water vapor, carbon dioxide, and ozone. Absorption by water vapor of the light reflected off the Earth's surface would determine the temperature lapse rate in the lower troposphere up to the bottom of the Tropical Transition Layer (TTL); radiative absorption by carbon dioxide would dominate the temperature lapse rate between the bottom of the TTL and the coldest point in the upper-troposphere, the cold point tropopause (CPT), and; absorption of incoming solar radiation by ozone would control the temperature above the CPT. The TTL region can thus be very sensitive to changes in the relative abundances of these greenhouse gases. In this contribution we describe the seasonal evolution of temperature profiles in the TTL and their longitudinal structure using GPS radio occultation.
global positioning system (GPS)↗
Assessment of Open-Loop Tracking Occultation Data from COSMIC
An assessment of open-loop tracking occultation data from Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) is presented.
COSMIC↗
Design and Verification of External Occulters for Direct Imaging of Extrasolar Planets
An occulter is an optical element which is placed in front of the telescope to block most of the light from a star before it reaches the optics inside, without blocking the planet.In our case, we use two spacecraft ying in formation: First has its edge shaped to cancel the starlight Second is the telescope which images the star and planet
starshades↗
Ionospheric Signatures in Radio Occultation Data
We can extend robustly the radio occultation data record by 6 years (+60%) by developing a singlefrequency processing method for GPS/MET data. We will produce a calibrated data set with profile-byprofile data characterization to determine robust upper bounds on ionospheric bias. Part of an effort to produce a calibrated RO data set addressing other key error sources such as upper boundary initialization. Planned: AIRS-GPS water vapor cross validation (water vapor climatology and trends).
radio occultation↗