GUVI

Global UltraViolet Imager

GUVI Biblio





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Found 16 entries in the Bibliography.


Showing entries from 1 through 16


2022

Solar cycle, seasonal, and dawn-to-dusk variations of the hydrogen in the upper thermosphere

Atomic hydrogen is one of the least-understood atmospheric constituents whose distribution is important for the studies of aeronomy and magnetospheric physics. Using 6 years of space-based daytime Lyman-α observations from 2002 to 2007, we quantify the solar cycle, seasonal, and dawn-to-dusk variations of the H density in the upper thermosphere. Our results show evident dawn-dusk asymmetry of the exobase H density that decreases nearly linearly from dawn to dusk. The observed asymmetry in terms of the dawn-dusk density rati ...

Wan, Changan; Qin, Jianqi; Paxton, Larry;

Published by: Journal of Geophysical Research: Space Physics      Published on:

YEAR: 2022     DOI: 10.1029/2022JA030504

2020

A Comparative Analysis of the OI 130.4-nm Emission Observed by NASA's TIMED Mission Using a Monte Carlo Radiative Transfer Model

Remote sensing of the OI 130.4-nm emission is potentially a useful means for routine monitoring of the atomic oxygen abundance in the upper atmosphere, especially for altitudes above urn:x-wiley:jgra:media:jgra55449:jgra55449-math-0001300 km where the OI 135.6-nm emission becomes too dim to be useful. However, to date, the interpretation of the OI 130.4-nm emission as a proxy for the O density remains ambiguous in that the relative contribution of the external and internal sources to the production of this emission has not b ...

Qin, Jianqi; Harding, Brian;

Published by: Journal of Geophysical Research: Space Physics      Published on:

YEAR: 2020     DOI: 10.1029/2019JA027520

Far Ultraviolet Remote Sensing of the Nighttime Ionosphere Using the OI 130.4-nm Emission

Qin, Jianqi;

Published by: Journal of Geophysical Research: Space Physics      Published on:

YEAR: 2020     DOI:

2019

Research Progress on On-Orbit Calibration Technology for Far Ultraviolet Payload

Li-ping, Fu; Nan, Jia; Xiu-qing, Hu; Tian, Mao; Fang, Jiang; Yun-gang, Wang; Ru-yi, Peng; Tian-fang, Wang; Da-xin, Wang; Shuang-tuan, Dou; , others;

Published by:       Published on:

YEAR: 2019     DOI:

First radiative transfer analysis of the OI 130.4-nm emission observed by NASA's TIMED mission

observed by the Global UltraViolet Imager (GUVI) aboard NASA s TIMED mission. The solar O densities, and/or that the GUVI and SEE calibrations may need to be revisited. We will

Qin, Jianqi; Harding, Brian;

Published by:       Published on:

YEAR: 2019     DOI:

2018

Nonparametric H Density Estimation Based on Regularized Nonlinear Inversion of the Lyman Alpha Emission in Planetary Atmospheres

Inversion of space-borne remote sensing measurements of the resonantly scattered solar Lyman alpha (121.6-nm) emission in planetary atmospheres is the most promising means of quantifying the H density in a vast volume of space near terrestrial planets. Owing to the highly nonlinear nature of the inverse problem and the lack of sufficient data constraints over the large volume of space where H atoms are present, previous inversion methods relied on physics-based parametric formulations of the H density distributions to gua ...

Qin, Jianqi; Harding, Brian; Waldrop, Lara;

Published by: Journal of Geophysical Research: Space Physics      Published on: 09/2018

YEAR: 2018     DOI: 10.1029/2018JA025954

Inferring nighttime ionospheric parameters with the far ultraviolet imager onboard the ionospheric connection explorer

The Ionospheric Connection Explorer (ICON) Far Ultraviolet (FUV) imager, ICON FUV, will measure altitude profiles of OI 135.6 nm emissions to infer nighttime ionospheric parameters.

Kamalabadi, Farzad; Qin, Jianqi; Harding, Brian; Iliou, Dimitrios; Makela, Jonathan; Meier, RR; England, Scott; Frey, Harald; Mende, Stephen; Immel, Thomas;

Published by: Space science reviews      Published on:

YEAR: 2018     DOI:

Empirical quantification of the vertical transport and escape of atomic hydrogen in the terrestrial upper atmosphere

Waldrop, Lara; Phal, Yamuna; Kerr, Robert; Qin, Jianqi;

Published by:       Published on:

YEAR: 2018     DOI:

2017

Redistribution of H atoms in the upper atmosphere during geomagnetic storms

Geocoronal H emission data acquired by NASA\textquoterights Thermosphere Ionosphere Mesosphere Energetics and Dynamics mission are analyzed to quantify the H density distribution over the entire magnetosphere-ionosphere-thermosphere region in order to investigate the response of the atmospheric system as a whole to geomagnetic storms. It is shown that at low and middle latitudes the H density averaged over storm times in the thermosphere-exosphere transition region decreases by \~30\%, while the H density at exospheric al ...

Qin, Jianqi; Waldrop, Lara; Makela, Jonathan;

Published by: Journal of Geophysical Research: Space Physics      Published on: 08/2017

YEAR: 2017     DOI: 10.1002/jgra.v122.1010.1002/2017JA024489

2016

Non-thermal hydrogen atoms in the terrestrial upper thermosphere

Model predictions of the distribution and dynamical transport of hydrogen atoms in the terrestrial atmosphere have long-standing discrepancies with ultraviolet remote sensing measurements, indicating likely deficiencies in conventional theories regarding this crucial atmospheric constituent. Here we report the existence of non-thermal hydrogen atoms that are much hotter than the ambient oxygen atoms in the upper thermosphere. Analysis of satellite measurements indicates that the upper thermospheric hydrogen temperature, m ...

Qin, Jianqi; Waldrop, Lara;

Published by: Nature Communications      Published on: 12/2016

YEAR: 2016     DOI: 10.1038/ncomms13655

Thermal structure of the ITM: old challenges and new insights

Waldrop, Lara; Qin, Jianqi;

Published by:       Published on:

YEAR: 2016     DOI:

Climatology of neutral hydrogen in the terrestrial thermosphere

Qin, Jianqi; Waldrop, Lara;

Published by:       Published on:

YEAR: 2016     DOI:

2015

Radiative transfer modeling of the OI 135.6~nm emission in the nighttime ionosphere

Remote sensing of the nighttime OI 135.6\ nm emissions has been a widely used method for measuring the\ F\ region ionospheric plasma densities. In this work, we first develop a comprehensive radiative transfer model from first principles to investigate the effects of different physical processes on the production and transport of the 135.6\ nm photons in the ionosphere and then propose a new approach for estimating electron densities from the nightglow. The forward modeling investigation indic ...

Qin, Jianqi; Makela, Jonathan; Kamalabadi, Farzad; Meier, R.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 11/2015

YEAR: 2015     DOI: 10.1002/jgra.v120.1110.1002/2015JA021687

OI 135.6-nm Emission; onosphere; Radiative transfer; remote sensing

Radiative transfer modeling of the OI 135.6 nm emission in the nighttime ionosphere

Qin, Jianqi; Makela, Jonathan; Kamalabadi, Farzad; Meier, RR;

Published by: Journal of Geophysical Research: Space Physics      Published on:

YEAR: 2015     DOI:

2014

Research on thermospheric densities derived from two-line element sets

Two-line Orbital Element Sets (TLEs) consist of mean orbital elements at epoch, along with the NORAD (North American Aerospace Defence Command) catalog number, international designator, epoch and additional fitting parameters. These information can be used to derive thermospheric densities through integration of differential equation for mean motion. For near-circular orbit satellites, derived thermospheric density can be seen as real density because of their stable orbit height, while for elliptical orbit satellites, thermo ...

Tingling, Ren; Juan, Miao; Siqing, Liu; Zhitao, Li;

Published by: Journal of Space Science      Published on:

YEAR: 2014     DOI:

2012

Optical System Design of a Spaceborne Broadband Far Ultraviolet Hyperspectral Imager

According to the application requirements for remote sensing of upper atmosphere,a reflective optical system of spaceborne far ultraviolet hyperspectral imager is designed.Which is composed of a scan mirror,an off-axis parabolic telescope and a toroidal grating spectrometer.An aberration-correction method for concave toroidal grating is developed.The initial parameters are solved based on the geometrical aberration theory of concave grating and then optimized using the optical design software Zemax,and the toroidal gating ...

Qingsheng, Xue;

Published by: Acta Optica Sinica      Published on:

YEAR: 2012     DOI:

optical design hyperspectral imager toroidal grating far ultraviolet geometrical aberration



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