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Found 16 entries in the Bibliography.
Showing entries from 1 through 16
| 2022 |
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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 |
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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 ... Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2020 DOI: 10.1029/2019JA027520 |
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Far Ultraviolet Remote Sensing of the Nighttime Ionosphere Using the OI 130.4-nm Emission
Published by: Journal of Geophysical Research: Space Physics Published on: |
| 2019 |
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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: |
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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 Published by: Published on: |
| 2018 |
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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 |
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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: |
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Waldrop, Lara; Phal, Yamuna; Kerr, Robert; Qin, Jianqi; Published by: Published on: |
| 2017 |
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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 |
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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 ... Published by: Nature Communications Published on: 12/2016 YEAR: 2016 DOI: 10.1038/ncomms13655 |
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Thermal structure of the ITM: old challenges and new insights
Published by: Published on: |
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Climatology of neutral hydrogen in the terrestrial thermosphere
Published by: Published on: |
| 2015 |
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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 |
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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: |
| 2014 |
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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: |
| 2012 |
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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 ... Published by: Acta Optica Sinica Published on: optical design hyperspectral imager toroidal grating far ultraviolet geometrical aberration |
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