Ms. Xiaojing Xu Profile

Xiaojing Xu

at Science Systems and Applications Inc

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Publications (4)

Proceedings Article | 17 September 2011 Paper

Advancements in understanding auroral ionosphere-thermosphere coupling from infrared remote sensing

Christopher Mertens, Xiaojing Xu, Stanley Wellard

Proceedings Volume 8154, 815405 (2011) https://doi.org/10.1117/12.895235

KEYWORDS: Infrared radiation, Information technology, Satellites, Infrared sensors, Remote sensing, Thermosphere, Solids, Radiometry, Chemistry, Spectral resolution

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Recent discoveries from analysis of measurements made by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on the Thermosphere-Ionosphere- Mesosphere Energetics and Dynamics (TIMED) satellite have shown that NO(v) 5.3 um emission is the primary mechanism of dissipating solar-geomagnetic storm energy in the thermosphere. Further insight into the ionosphere-thermosphere (IT) storm-time response emerged from observations and analysis of the SABER 4.3 um channel radiances, which showed that nighttime 4.3 um emission is dominated by NO⁺(v) during geomagnetically disturbed conditions. Analysis of SABER NO⁺(v) 4.3 um emission led to major advances in the understanding of E-region ion-neutral chemistry and kinetics, such as the identification of a new source of auroral 4.3 um emission, which also provides a new context for understanding auroral infrared emission from O₂(a¹▵g). Surprisingly, NO⁺(v) 4.3 um emission is the second largest contribution to solar-geomagnetic infrared radiative response and provides a non-negligible contribution to the "natural thermostat" thought to be solely due to NO(v) 5.3 um emission. Despite these major advances, a fully physics-based understanding of the two largest sources of storm-time energy dissipation in the IT system from NO(v) and NO⁺(v) is lacking because of the limited information content contained in SABER's broadband infrared channel measurements. On the other hand, detailed information on the chemical-radiative excitation and loss processes for NO(v), NO⁺(v), and O₂(a¹▵g) emission is encoded in the infrared spectrum, of which SABER only provides an integral constraint. Consequently, a prototype infrared field-wide Michelson interferometer (FWMI) is currently under development to advance the understanding of IT storm-time energetics beyond the current state of knowledge. It is anticipated that progress in the developments of the FWMI technology, along with advancements in a physics-based understanding of the fundamental chemical-radiative mechanisms responsible for IT infrared emission, will play an integral role in the future planning of a rocket-borne and satellite-based Eregion science missions. In this paper, a survey of recent SABER discoveries in IT ion-neutral coupling will be given, open questions in a physics-based understanding of chemical-radiative vibration-rotation excitation and loss from important IT infrared emitters will be identified, and the FWMI instrument requirements necessary to address these open science questions will be presented.

Proceedings Article | 29 September 2009 Paper

Development of a geomagnetic storm correction to the international reference ionosphere model E-region electron densities using TIMED/SABER observations

C. Mertens, X. Xu, J. Fernandez, D. Bilitza, J. Russell, M. Mlynczak

Proceedings Volume 7475, 747508 (2009) https://doi.org/10.1117/12.829976

KEYWORDS: IRIS Consortium, Intelligence systems, Magnetism, Climatology, Infrared radiation, Radar, Data modeling, Satellites, Correlation function, Radiometry

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Proceedings Article | 22 August 2002 Paper

Design of the optical system for FSO access

Xiaojing Xu, Xiuhua Yuan, Dexiu Huang

Proceedings Volume 4911, (2002) https://doi.org/10.1117/12.480490

KEYWORDS: Free space optics, Telescopes, Optical design, Sensors, Wireless communications, Space telescopes, Polarization, Fiber optic gyroscopes, Free space optical communications, Telecommunications

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Proceedings Article | 22 August 2002 Paper

Wide-range light power gain equalization of the communication system for the wireless optical access network

Xiuhua Yuan, Dexiu Huang, Deming Liu, Jin Wang, Xiaojing Xu

Proceedings Volume 4911, (2002) https://doi.org/10.1117/12.480492

KEYWORDS: Telecommunications, Visibility, Visibility through fog, Control systems, Receivers, Sensors, Platinum, Atmospheric propagation, Signal attenuation, Wireless communications

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