GUVI Biblio





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Found 218 entries in the Bibliography.


Showing entries from 1 through 50


2022

Simultaneous Detection of Signatures of Conjugate Photoelectrons in the Ionosphere and Thermosphere

We investigate the impact of conjugate photoelectrons (CPEs) on the topside (∼600 km altitude) ionosphere at low and midlatitudes using measurements of the ion temperature, density, and composition from the first Republic of China satellite during a period of the high to moderate solar activity (March 1999 to June 2004). Elevated ion temperatures and densities are observed in the dark Northern American-Atlantic sector during the December solstice and in the Australian sector during the June solstice. The oxygen ion fractio ...

Kil, Hyosub; Paxton, Larry; Schaefer, Robert;

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

YEAR: 2022     DOI: 10.1029/2021JA030121

airglow; conjugate photoelectron; ion density; ion temperature

Assimilative Mapping of Auroral Electron Energy Flux Using SSUSI Lyman-Birge-Hopfield (LBH) Emissions

Far ultraviolet (FUV) imaging of the aurora from space provides great insight into the dynamic coupling of the atmosphere, ionosphere, and magnetosphere on global scales. To gain a quantitative understanding of these coupling processes, the global distribution of auroral energy flux is required, but the inversion of FUV emission to derive precipitating auroral particles energy flux is not straightforward. Furthermore, the spatial coverage of FUV imaging from Low Earth Orbit (LEO) altitudes is often insufficient to achieve g ...

Li, J.; Matsuo, T.; Kilcommons, L.;

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

YEAR: 2022     DOI: 10.1029/2021JA029739

The origin of midlatitude plasma depletions detected during the 12 February 2000 and 29 October 2003 geomagnetic storms

Kil, Hyosub; Chang, Hyeyeon; Lee, Woo; Paxton, Larry; Sun, Andrew; Lee, Jiyun;

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

YEAR: 2022     DOI:

Two different properties of ionospheric perturbations detected in the vicinity of the Korean Peninsula after the Hunga-Tonga volcanic eruption on 15 January 2022

Hong, Junseok; Kil, Hyosub; Lee, Woo; Kwak, Young-Sil; Choi, Byung-Kyu; Paxton, Larry;

Published by:       Published on:

YEAR: 2022     DOI:

Increased Sensitivity FUV Spectrographic Imager

Schaefer, RK; Paxton, LJ; Zhang, Y; Kil, H; Liou, K;

Published by:       Published on:

YEAR: 2022     DOI:

Hemispheric Asymmetry in the Auroral Ionosphere-Thermosphere System

Liou, K; Zhang, Y-L; Paxton, LJ; Kil, H; Schaefer, R;

Published by:       Published on:

YEAR: 2022     DOI:

Ionospheric Disturbances in Low- and Midlatitudes During the Geomagnetic Storm on 26 August 2018

Plasma density depletions at midlatitudes during geomagnetic storms are often understood in terms of equatorial plasma bubbles (EPBs) due to their morphological similarity. However, our study reports the observations that reveal the generation of plasma depletions at midlatitudes by local sources. During the geomagnetic storm on 26 August 2018, the Defense Meteorological Satellite Program and Swarm satellites detected plasma depletions at midlatitudes in the Asian sector in the absence of EPBs in the equatorial region. This ...

Chang, Hyeyeon; Kil, Hyosub; Sun, Andrew; Zhang, Shun-Rong; Lee, Jiyun;

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

YEAR: 2022     DOI: 10.1029/2021JA029879

2021

Exploring the Upper Atmosphere

In this chapter, we describe how we can understand the state of the upper atmosphere (the ionosphere, thermosphere, and aurora) using optical observations and how one produces a global view of the Earth s upper atmosphere from optical remote sensing, especially using far ultraviolet (FUV) wavelengths, to advance our understanding of the near Earth space environment. We examine the choice of optical signatures, the basic science behind the signatures, and the techniques for observations. Examples of the technique as applied t ...

Paxton, Larry; Zhang, Yongliang; Kil, Hyosub; Schaefer, Robert;

Published by:       Published on:

YEAR: 2021     DOI: 10.1002/9781119815631.ch23

Earth space environment; far ultraviolet wavelengths; high-latitude regions; optical remote sensing; solar wind; upper atmosphere

Global distribution of nighttime MSTIDs and its association with E region irregularities seen by CHAMP satellite

Lee, Woo; Kil, Hyosub; Paxton, Larry;

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

YEAR: 2021     DOI:

Exploring the upper atmosphere: Using optical remote sensing

Paxton, Larry; Zhang, Yongliang; Kil, Hyosub; Schaefer, Robert;

Published by: Upper Atmosphere Dynamics and Energetics      Published on:

YEAR: 2021     DOI:

Far Ultraviolet Hyperspectral Imager: NASA s TIMED/GUVI and DMSP SSUSI

Paxton, Larry; Zhang, Yongliang; Schaefer, Robert; Kil, Hyosub; Wolven, Brian; Romeo, Giuseppe; Yonker, Justin;

Published by:       Published on:

YEAR: 2021     DOI:

Signatures of conjugate photoelectrons in the ionosphere and thermosphere

Kil, Hyosub; Paxton, Larry; Schaefer, Robert; Huba, Joseph;

Published by:       Published on:

YEAR: 2021     DOI:

Exploring the Upper Atmosphere: Using Optical Remote Sensing

Paxton, Larry; Zhang, Yongliang; Kil, Hyosub; Schaefer, Robert;

Published by: Upper Atmosphere Dynamics and Energetics      Published on:

YEAR: 2021     DOI:

Large Electron Densities in the Early Morning Equatorial Ionosphere Observed with UV Instruments from Space

Schaefer, Robert; Paxton, Larry; Zhang, Yongliang; Kil, Hyosub; Romeo, Giuseppe; Wolven, Brian; Yonker, Justin;

Published by:       Published on:

YEAR: 2021     DOI:

2020

The Far Ultraviolet Signatures of Conjugate Photoelectrons Seen by the Special Sensor Ultraviolet Spectrographic Imager

This study investigates the origin of anomalous far ultraviolet emissions observed at night at the subauroral region by the Special Sensor Ultraviolet Spectrographic Imager on board the Defense Meteorological Satellite System-F16 satellite. The global distribution of the anomalous emission is derived using the measurements of the oxygen atom 130.4-nm emission in 2017. Our results show the extension of the anomalous emission from high latitudes to middle latitudes in the Northern American-Atlantic sector during the Decembe ...

Kil, Hyosub; Schaefer, Robert; Paxton, Larry; Jee, Geonhwa;

Published by: Geophysical Research Letters      Published on: 01/2020

YEAR: 2020     DOI: 10.1029/2019GL086383

conjugate photoelectron; far ultraviolet emission; thermosphere; remote sensing data

Impacts of Binning Methods on High-Latitude Electrodynamic Forcing: Static Versus Boundary-Oriented Binning Methods

An outstanding issue in the general circulation model simulations for Earth\textquoterights upper atmosphere is the inaccurate estimation of Joule heating, which could be associated with the inaccuracy of empirical models for high-latitude electrodynamic forcing. The binning methods used to develop those empirical models may contribute to the inaccuracy. Traditionally, data are binned through a static binning approach by using fixed geomagnetic coordinates, in which the dynamic nature of the forcing is ...

Zhu, Qingyu; Deng, Yue; Richmond, Arthur; Maute, Astrid; Chen, Yun-Ju; Hairston, Marc; Kilcommons, Liam; Knipp, Delores; Redmon, Robert; Mitchell, Elizabeth;

Published by: Journal of Geophysical Research: Space Physics      Published on: 01/2020

YEAR: 2020     DOI: 10.1029/2019JA027270

Electric field; high latitude; Joule heating; particle precipitation

The far ultraviolet signatures of conjugate photoelectrons seen by the Special Sensor Ultraviolet Spectrographic Imager

Kil, Hyosub; Schaefer, Robert; Paxton, Larry; Jee, Geonhwa;

Published by: Geophysical Research Letters      Published on:

YEAR: 2020     DOI:

Origin and distribution of daytime electron density irregularities in the low-latitude F region

Kil, Hyosub; Lee, Woo; Paxton, Larry;

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

YEAR: 2020     DOI:

The Origin of Bubble-like Structures in Midlatitudes during Geomagnetic Storms

Kil, Hyosub; Paxton, Larry; Lee, Woo;

Published by:       Published on:

YEAR: 2020     DOI:

2019

Plasma Blobs Associated With Medium-Scale Traveling Ionospheric Disturbances

Plasma blobs represent plasma density enhancements with respect to ambient plasma. The formation of blobs in low and middle latitudes is understood in association with either equatorial plasma bubbles or medium-scale traveling ionospheric disturbances (MSTIDs). This study reports four blob events identified from the Swarm satellite observations in 2014. Those blobs show the conjugate property and the alignment in the northwest-southeast direction in the Northern Hemisphere and southwest-northeast direction in the Southern ...

Kil, Hyosub; Paxton, Larry; Jee, Geonhwa; Nikoukar, Romina;

Published by: Geophysical Research Letters      Published on: 03/2019

YEAR: 2019     DOI: 10.1029/2019GL082026

Addressing O2R with the SSUSI Operational Space Sensor: Lessons Learned

Schaefer, Robert; Paxton, Larry; Romeo, Giuseppe; Kil, Hyosub; Wolven, Brian; Zhang, Yongliang;

Published by:       Published on:

YEAR: 2019     DOI:

Plasma blobs associated with medium-scale traveling ionospheric disturbances

Kil, Hyosub; Paxton, Larry; Jee, Geonhwa; Nikoukar, Romina;

Published by: Geophysical Research Letters      Published on:

YEAR: 2019     DOI:

Daytime evolution of equatorial plasma bubbles observed by the first Republic of China satellite

Kil, Hyosub; Paxton, Larry; Lee, Woo; Jee, Geonhwa;

Published by: Geophysical Research Letters      Published on:

YEAR: 2019     DOI:

2018

Tropical Ionization Trough in the Ionosphere Seen by Swarm-A Satellite

A new type of ionization trough, the tropical ionization trough, is identified in the tropical F region from the Swarm-A satellite observations in December 2013 to January 2017. The trough is formed around midnight near 25\textdegree magnetic latitudes in the winter hemisphere during the solstices. The trough is pronounced around 330\textdegreeE longitude in the Southern Hemisphere (negative magnetic declination) during the June solstices and around 210\textdegreeE longitude in the Northern Hemisphere (p ...

Lee, Woo; Kil, Hyosub; Paxton, Larry;

Published by: Geophysical Research Letters      Published on: 11/2018

YEAR: 2018     DOI: 10.1029/2018GL080286

Global distribution of medium scale traveling ionospheric disturbances seen by Swarm and CHAMP satellites

Kil, Hyosub; Lee, Woo; Paxton, Larry;

Published by: 42nd COSPAR Scientific Assembly      Published on:

YEAR: 2018     DOI:

The morphology and driver of the tropical ionization trough

Lee, Woo; Kil, Hyosub; Paxton, Larry;

Published by: 42nd COSPAR Scientific Assembly      Published on:

YEAR: 2018     DOI:

The role of plasma bubbles and traveling ionospheric disturbances in the creation of plasma blobs

Kil, Hyosub; Paxton, Larry;

Published by: 42nd COSPAR Scientific Assembly      Published on:

YEAR: 2018     DOI:

SSUSI and SSUSI-Lite: Providing space situational awareness and support for over 25 years

Paxton, Larry; Schaefer, Robert; Zhang, Yongliang; Kil, Hyosub; Hicks, John;

Published by: Johns Hopkins APL Technical Digest      Published on:

YEAR: 2018     DOI:

Tropical ionization trough in the ionosphere seen by Swarm-A satellite

Lee, Woo; Kil, Hyosub; Paxton, Larry;

Published by: Geophysical Research Letters      Published on:

YEAR: 2018     DOI:

The effect of equatorial fountain on the evolution of equatorial plasma bubbles

Kil, Hyosub; Paxton, Larry;

Published by:       Published on:

YEAR: 2018     DOI:

2017

Far ultraviolet instrument technology

The far ultraviolet (FUV) spectral range (from about 115 nm to 180 nm) is one of the most useful spectral regions for characterizing the upper atmosphere (thermosphere and ionosphere). The principal advantages are that there are FUV signatures of the major constituents of the upper atmosphere as well as the signatures of the high-latitude energy inputs. Because of the absorption by thermospheric O2, the FUV signatures are seen against a \textquotedblleftblack\textquotedblright background, i.e., one that is not ...

Paxton, Larry; Schaefer, Robert; Zhang, Yongliang; Kil, Hyosub;

Published by: Journal of Geophysical Research: Space Physics      Published on: 01/2017

YEAR: 2017     DOI: 10.1002/jgra.v122.210.1002/2016JA023578

Global distribution of nighttime medium-scale traveling ionospheric disturbances seen by Swarm satellites

Kil, Hyosub; Paxton, Larry;

Published by: Geophysical Research Letters      Published on:

YEAR: 2017     DOI:

2016

Climatological aspect of the equatorial ionospheric dynamics seen by TIMED/GUVI

Kil, Hyosub; Paxton, Larry;

Published by:       Published on:

YEAR: 2016     DOI:

Structure and Variability in the Ionosphere using DMSP/SSUSI and TIMED/GUVI Data

Bruntz, Robert; Paxton, Larry; Kil, Hyosub; Schaefer, Robert; Zhang, Yongliang; Miller, Ethan;

Published by:       Published on:

YEAR: 2016     DOI:

Solar flare impact on FUV based thermospheric O/N2 estimation

Zhang, Y; Paxton, LJ; Kil, H;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on:

YEAR: 2016     DOI:

Equatorial broad plasma depletions associated with the evening prereversal enhancement and plasma bubbles during the 17 March 2015 storm

Kil, Hyosub; Lee, Woo; Paxton, Larry; Hairston, Marc; Jee, Geonhwa;

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

YEAR: 2016     DOI:

NASA Timed Guvi and Dmsp Ssusi Observations of the St. Patricks Day Storm of

Paxton, Larry; Zhang, Yongliang; Kil, Hyosub; Mitchell, Elizabeth; Schaefer, Robert;

Published by: 41st COSPAR Scientific Assembly      Published on:

YEAR: 2016     DOI:

2015

The Morphology of Equatorial Plasma Bubbles - a review

Plasma bubbles that occur in the equatorial F-region make up one of the most distinguishing phenomena in the ionosphere. Bubbles represent plasma depletions with respect to the background ionosphere, and are the major source of electron density irregularities in the equatorial F-region. Such bubbles are seen as plasma depletion holes (in situ satellite observations), vertical plumes (radar observations), and emission-depletion bands elongated in the north-south direction (optical observations). However, no technique can o ...

Kil, Hyosub;

Published by: Journal of Astronomy and Space Sciences      Published on: 03/2013

YEAR: 2015     DOI: 10.5140/JASS.2015.32.1.13

Equatorial ionosphere; irregularities; plasma bubble

Remote Sensing of Earth\textquoterights Limb by TIMED/GUVI: Retrieval of thermospheric composition and temperature

The Global Ultraviolet Imager (GUVI) onboard the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite senses far ultraviolet emissions from O and N2 in the thermosphere. Transformation of far ultraviolet radiances measured on the Earth limb into O, N2, and O2 number densities and temperature quantifies these responses and demonstrates the value of simultaneous altitude and geographic information. Composition and temperature variations are available from 2002 to 2007 ...

Meier, R.; Picone, J.; Drob, D.; Bishop, J.; Emmert, J.; Lean, J.; Stephan, A.; Strickland, D.; Christensen, A.; Paxton, L.; Morrison, D.; Kil, H.; Wolven, B.; Woods, Thomas; Crowley, G.; Gibson, S.;

Published by: Earth and Space Science      Published on: 01/2015

YEAR: 2015     DOI: 10.1002/2014EA000035

airglow and aurora; remote sensing; thermosphere: composition and chemistry; thermosphere: energy deposition

Structures in Polar Rain Auroras

Zhang, Yongliang; Paxton, Larry; Kil, Hyosub;

Published by: Auroral Dynamics and Space Weather      Published on:

YEAR: 2015     DOI:

The morphology of equatorial plasma bubbles-a review

Kil, Hyosub;

Published by: Journal of Astronomy and Space Sciences      Published on:

YEAR: 2015     DOI:

Morphology of the postsunset vortex in the equatorial ionospheric plasma drift

Lee, Woo; Kil, Hyosub; Kwak, Young-Sil; Paxton, Larry;

Published by: Geophysical Research Letters      Published on:

YEAR: 2015     DOI:

GUVI and SSUSI Observations of the St. Patrick s Day Storms

Paxton, Larry; Schaefer, Robert; Zhang, Yongliang; Bust, Gary; Kil, Hyosub;

Published by:       Published on:

YEAR: 2015     DOI:

2014

Geomagnetic control of equatorial plasma bubble activity modeled by the TIEGCM with Kp

Describing the day-to-day variability of Equatorial Plasma Bubble (EPB) occurrence remains a significant challenge. In this study we use the Thermosphere-Ionosphere Electrodynamics General Circulation Model (TIEGCM), driven by solar (F10.7) and geomagnetic (Kp) activity indices, to study daily variations of the linear Rayleigh-Taylor (R-T) instability growth rate in relation to the measured scintillation strength at five longitudinally distributed stations. For locations characterized ...

Carter, B.; Retterer, J.; Yizengaw, E.; Groves, K.; Caton, R.; McNamara, L.; Bridgwood, C.; Francis, M.; Terkildsen, M.; Norman, R.; Zhang, K.;

Published by: Geophysical Research Letters      Published on: 08/2014

YEAR: 2014     DOI: 10.1002/2014GL060953

Equatorial ionosphere; plasma bubbles; TIEGCM

Storm-time behaviors of O/N2 and NO variations

Algorithms have been developed to extract net nitric oxide (NO) radiances in the wavelength range of 172\textendash182\ nm from the dayside TIMED/GUVI spectrograph data and convert them to NO column density (100\textendash150\ km). The thermospheric O/N2 column density ratios (referenced from an altitude ~135\ km with a N2column density of 1017\ cm-2) are also obtained from the spectrograph data. The spatial resolution of the NO and O/N2 products a ...

Zhang, Y.; Paxton, L.J.; Morrison, D.; Marsh, D.; Kil, H.;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: 07/2014

YEAR: 2014     DOI: 10.1016/j.jastp.2014.04.003

geomagnetic storm; Thermospheric nitric oxide; Thermospheric O/N2 ratio

An analysis of the quiet time day-to-day variability in the formation of postsunset equatorial plasma bubbles in the Southeast Asian region

Presented is an analysis of the occurrence of postsunset Equatorial Plasma Bubbles (EPBs) detected using a Global Positioning System (GPS) receiver at Vanimo. The three year data set shows that the EPB occurrence maximizes (minimizes) during the equinoxes (solstices), in good agreement with previous findings. The Vanimo ionosonde station is used with the GPS receiver in an analysis of the day-to-day EPB occurrence variability during the 2000 equinox period. A superposed epoch analysis (SEA) reveals that the altitude, and ...

Carter, B.; Yizengaw, E.; Retterer, J.; Francis, M.; Terkildsen, M.; Marshall, R.; Norman, R.; Zhang, K.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 04/2014

YEAR: 2014     DOI: 10.1002/jgra.v119.410.1002/2013JA019570

equatorial plasma bubbles; GPS scintillation; Ionosphere

Investigation of the Tidal Signatures in the Thermosphere Using the TIMED/GUVI Data

Kil, Hyosub; Paxton, Larry; Zhang, Yongliang; Kwak, Young-Sil; Lee, Woo;

Published by:       Published on:

YEAR: 2014     DOI:

Interannual Variability of the Atmospheric Tides over South Pole from a Decade of Meteor Wind Observations

Paxton, LJ; Schaefer, RK; Zhang, Y; Bust, GS; Kil, H;

Published by:       Published on:

YEAR: 2014     DOI:

The role of the postsunset vortex in the creation of turbulence in the bottomside F region

Lee, Woo; Kil, Hyosub; Kwak, Young-Sil; Paxton, Larry;

Published by:       Published on:

YEAR: 2014     DOI:

The zonal motion of equatorial plasma bubbles relative to the background ionosphere

Kil, Hyosub; Lee, Woo; Kwak, Young-Sil; Zhang, Yongliang; Paxton, Larry; Milla, Marco;

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

YEAR: 2014     DOI:



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