Modeling impact of FORMOSAT‐7/COSMIC‐2 mission on ionospheric space weather monitoring

Lee, I. T.; Tsai, Ho‐Fang; Liu, J. Y.; Lin, Charles; Matsuo, Tomoko; Chang, Loren C.

doi:10.1002/jgra.50538

Cited by 25 publications

(27 citation statements)

References 23 publications

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“…Anthes et al , 2008) and the future COSMIC‐2/FORMOSAT‐7 (e.g. Lee et al , 2013) follow‐on provide a wealth of data for weather and climate applications, providing a relatively inexpensive approach for sounding the global atmosphere with high precision, accuracy and vertical resolution, seamlessly through precipitation and across land–ocean boundaries. Several studies within the past decade have demonstrated the positive impact that results when RO is assimilated into numerical weather prediction models by operational forecast agencies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Probability of intense precipitation from polarimetric GNSS radio occultation observations

Cardellach

Padullés

Tomás

et al. 2017

Quart J Royal Meteoro Soc

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There is currently a gap in satellite observations of the moisture structure during heavy precipitation conditions, since infrared and microwave sounders cannot sense water-vapour structure near the surface in the presence of intense precipitation. Conversely, Global Navigation Satellite System (GNSS) radio occultations (RO) can profile the moisture structure with high precision and vertical resolution, but cannot indicate the presence of precipitation directly. Polarimetric RO (PRO) measurements have been proposed as a method to characterize heavy rain in GNSS RO, by measuring the polarimetric differential phase delay induced by large size hydrometeors. Previous studies have shown that the PRO polarimetric phase shift is sensitive to the path-integrated rain rate under intense precipitation scenarios, but there is no current method to invert PRO measurements into quantitative estimates of the path-averaged rain rate. In this manuscript, a probabilistic inversion approach to the GNSS PRO observables is proposed, where the GPM precipitation products are used for the construction of an a priori look-up table (LUT) database. The performance of the LUTs is assessed for use in the inversion of satellite-based GNSS PRO observations, based on synthetically generated PRO data of actual events, which correspond to co-locations between GNSS RO profiles and the TRMM observations. The synthetic data include end-to-end propagation effects of the polarimetric observables and a simple separation algorithm to isolate the hydrometeor component of the observation. The assessment results in agreement better than ±1 mm h −1 between the reference LUT and the actual rain statistics of the synthetic data, proving the suitability of the GPMbased probabilistic inversion tool. These findings indicate that the GNSS PRO products are capable of extending the current GNSS RO ones by associating indications of rainrate probabilities at different altitudes, at ∼250 m vertical resolution and under intense precipitation scenarios with the standard vertical thermodynamic profiles.

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Section: Introductionmentioning

confidence: 99%

Probability of intense precipitation from polarimetric GNSS radio occultation observations

Cardellach

Padullés

Tomás

et al. 2017

Quart J Royal Meteoro Soc

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“…It not only predicts the growth of the X-and O-mode waves but is also an efficient mechanism for direct amplification of waves. This mechanism have also been applied to the generation of Z-and whistler-mode waves, in which these waves can, in turn, further accelerate electrons from a few hundreds of keV to MeV (Lee et al 2012a(Lee et al , 2013a.…”

Section: Solar-solar Wind-magnetospherementioning

confidence: 99%

The fast development of solar terrestrial sciences in Taiwan

et al. 2016

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In Taiwan, research and education of solar terrestrial sciences began with a ground-based ionosonde operated by Ministry of Communications in 1952 and courses of ionospheric physics and space physics offered by National Central University (NCU) in 1959, respectively. Since 1990, to enhance both research and education, the Institute of Space Science at NCU has been setting up and operating ground-based observations of micropulsations, very high-frequency radar, low-latitude ionospheric tomography network, high-frequency Doppler sounder, digital ionosondes, and total electron content (TEC) derived from ground-based GPS receivers to study the morphology of the ionosphere for diurnal, seasonal, geophysical, and solar activity variations, as well as the ionosphere response to solar flares, solar wind, solar eclipses, magnetic storms, earthquakes, tsunami, and so on. Meanwhile, to have better understanding on physics and mechanisms, model simulations for the heliosphere, solar wind, magnetosphere, and ionosphere are also introduced and developed. After the 21 September 1999 Mw7.6 Chi-Chi earthquake, seismo-ionospheric precursors and seismo-traveling ionospheric disturbances induced by earthquakes become the most interesting and challenging research topics of the world. The development of solar terrestrial sciences grows even much faster after National Space Origination has been launching a series of FORMOSAT satellites since 1999. ROCSAT-1 (now renamed FORMO-SAT-1) measures the ion composition, density, temperature, and drift velocity at the 600-km altitude in the low-latitude ionosphere; FORMOSAT-2 is to investigate lightning-induced transient luminous events, polar aurora, and upper atmospheric airglow, and FORMOSAT-3 probes ionospheric electron density profiles of the globe. In the near future, FORMOSAT-5 and FORMOSAT-7/COSMIC-2 will be employed for studying solar terrestrial sciences. These satellite missions play an important role on the recent development of solar terrestrial sciences in Taiwan.

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“…The Global Assimilative Ionospheric Model and the Global Assimilation of Ionospheric Measurements developed by the University of Southern California/Jet Propulsion Laboratory (Hajj et al, ; Komjathy et al, ; Wang et al, ) and the Utah State University (Scherliess et al, ; Schunk et al, ) have a capability of assimilating multiple sources of ionospheric observations into the time‐dependent and physics‐based ionospheric models. Recently, the importance of treating the ionosphere‐thermosphere as a coupled system in the ionospheric data assimilation has been studied (e.g., Chen et al, ; Hsu et al, ; Lee et al, , ; Matsuo & Araujo‐Pradere, ; Sun et al, ).…”

Section: Introductionmentioning

confidence: 99%

Data Assimilation of Ground‐Based GPS and Radio Occultation Total Electron Content for Global Ionospheric Specification

et al. 2017

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This study presents an approach based on the Gauss‐Markov Kalman filter to assimilate the total electron content observed from ground‐based GPS receivers and space‐based radio occultation instrumentations (such as FORMOSAT‐3/COSMIC (F3/C) and FORMOSAT‐7/COSMIC‐2 (F7/C2)) into the International Reference Ionosphere. Observing System Simulation Experiments (OSSEs) show that the data assimilation procedure consisting of the forecast and the measurement update steps can better improve the accuracy of the data assimilation analysis than the assimilation procedure using the measurement update alone. Compared with F3/C, the denser F7/C2 occultation observations can improve the analysis accuracy significantly as suggested by OSSEs. The real data assimilation results are further validated with global ionosphere maps, the global ground‐based GPS measurements, and the ionospheric F2 peak height and electron density sounded by ionosondes. Both the OSSEs and validation results confirm that a number of improvements to the data assimilation procedure presented in this paper can indeed be used to reconstruct the three‐dimensional ionospheric electron density adequately.

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Modeling impact of FORMOSAT‐7/COSMIC‐2 mission on ionospheric space weather monitoring

Cited by 25 publications

References 23 publications

Probability of intense precipitation from polarimetric GNSS radio occultation observations

Probability of intense precipitation from polarimetric GNSS radio occultation observations

The fast development of solar terrestrial sciences in Taiwan

Data Assimilation of Ground‐Based GPS and Radio Occultation Total Electron Content for Global Ionospheric Specification

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