FORMOSAT-7/COSMIC-2 GNSS radio occultation constellation mission for global weather monitoring

Cook, Kendra L. B.; Fong, Chen-Joe; Wenkel, Michael J.; Wilczynski, Peter; Yen, Nick; Chang, Guey-Shin

doi:10.1109/aero.2013.6497317

Cited by 15 publications

(6 citation statements)

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“…A comparison of the ion peak height hmF2 and peak density NmF2 with measurements by the COSMIC-2 constellation (Cook et al. 2013 ) and ionosondes revealed that the FUV observations are consistent with the COSMIC-2 and ionosonde measurements, with an average density bias lower than . When restricting the analysis to cases having an NmF2 value larger than , FUV provides the peak electron density with a mean difference with COSMIC-2 of 10% (Wautelet et al.…”

Section: Science Resultssupporting

confidence: 56%

In Flight Performance of the Far Ultraviolet Instrument (FUV) on ICON

et al. 2023

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The NASA Ionospheric Connection Explorer (ICON) was launched in October 2019 and has been observing the upper atmosphere and ionosphere to understand the sources of their strong variability, to understand the energy and momentum transfer, and to determine how the solar wind and magnetospheric effects modify the internally-driven atmosphere-space system. The Far Ultraviolet Instrument (FUV) supports these goals by observing the ultraviolet airglow in day and night, determining the atmospheric and ionospheric composition and density distribution. Based on the combination of ground calibration and flight data, this paper describes how major instrument parameters have been verified or refined since launch, how science data are collected, and how the instrument has performed over the first 3 years of the science mission. It also provides a brief summary of science results obtained so far.

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Section: Science Resultssupporting

confidence: 56%

In Flight Performance of the Far Ultraviolet Instrument (FUV) on ICON

et al. 2023

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“…Insufficient data collection limited the spatial and temporal resolutions of the assimilated model. In the future, with the launch of the COSMIC‐2 project [ Cook et al ., ], we expect for a revolutionary more observations and optimized data coverage to construct a more accurate plasmasphere model. We should also bear in mind that our conclusions regarding the impact of the assimilation are somewhat limited due to only considering a single day.…”

Section: Resultsmentioning

confidence: 99%

Data assimilation of plasmasphere and upper ionosphere using COSMIC/GPS slant TEC measurements

Guo

et al. 2015

Radio Science

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Increasing total electron content (TEC) measurements from the low Earth orbiting satellites to Global Positioning System satellites flourish the exploration of the ionosphere and plasmasphere for decades. This paper indicates a method that 3-D Var is applied to assimilate precise orbit determination antenna TEC measurements of Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) satellites into the background global core plasma model (GCPM). The slant TEC data archived in the COSMIC Data Analysis and Archive Center from 500 km to 20,200 km are used to reconstruct a new electron density model. This model has a temporal resolution of 2 h and spatial resolutions of 2.5°in geomagnetic latitude, 5°in longitude, 50 km in the upper ionosphere, and several hundred kilometers in the plasmasphere. Preliminary results show that the data assimilation modifies the initial GCPM forecast to be better coincident with actual COSMIC measurements in internal quality check. Furthermore, independent validation with upper ionosphere-retrieved electron density and TEC of global ionosphere maps implies a reasonable improvement in the estimation of plasmaspheric electron density after the assimilation.

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“…The 12-satellite COSMIC-2 constellation (Cook et al, 2013) will boast more than 8000 soundings per day, measuring the occultations of satellites from the European navigation satellite system GALILEO and the Russian Global Navigation Satellite System (GLONASS), in addition to the American GPS satellite constellation. COSMIC-2 will feature two deployment phases from which large numbers of closely spaced profile pairs can be expected.…”

Section: Discussionmentioning

confidence: 99%

The southern stratospheric gravity wave hot spot: individual waves and their momentum fluxes measured by COSMIC GPS-RO

et al. 2015

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Abstract. Nearly all general circulation models significantly fail to reproduce the observed behaviour of the southern wintertime polar vortex. It has been suggested that these biases result from an underestimation of gravity wave drag on the atmosphere at latitudes near 60 • S, especially around the "hot spot" of intense gravity wave fluxes above the mountainous Southern Andes and Antarctic peninsula. Here, we use Global Positioning System radio occultation (GPS-RO) data from the COSMIC satellite constellation to determine the properties of gravity waves in the hot spot and beyond. We show considerable southward propagation to latitudes near 60 • S of waves apparently generated over the southern Andes. We propose that this propagation may account for much of the wave drag missing from the models. Furthermore, there is a long leeward region of increased gravity wave energy that sweeps eastwards from the mountains over the Southern Ocean. Despite its striking nature, the source of this region has historically proved difficult to determine. Our observations suggest that this region includes both waves generated locally and orographic waves advected downwind from the hot spot. We describe and use a new wavelet-based analysis technique for the quantitative identification of individual waves from COSMIC temperature profiles. This analysis reveals different geographical regimes of wave amplitude and short-timescale variability in the wave field over the Southern Ocean. Finally, we use the increased numbers of closely spaced pairs of profiles from the deployment phase of the COSMIC constellation in 2006 to make estimates of gravity wave horizontal wavelengths. We show that, given sufficient observations, GPS-RO can produce physically reasonable estimates of stratospheric gravity wave momentum flux in the hot spot that are consistent with measurements made by other techniques. We discuss our results in the context of previous satellite and modelling studies and explain how they advance our understanding of the nature and origins of waves in the southern stratosphere.

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FORMOSAT-7/COSMIC-2 GNSS radio occultation constellation mission for global weather monitoring

Cited by 15 publications

References 1 publication

In Flight Performance of the Far Ultraviolet Instrument (FUV) on ICON

In Flight Performance of the Far Ultraviolet Instrument (FUV) on ICON

Data assimilation of plasmasphere and upper ionosphere using COSMIC/GPS slant TEC measurements

The southern stratospheric gravity wave hot spot: individual waves and their momentum fluxes measured by COSMIC GPS-RO

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