GUVI Biblio

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;

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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:

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:

Storm-Time Behaviors of the Thermospheric O/N2 and NO Variations

Zhang, Yongliang; Paxton, Larry; Morrison, Daniel; Kil, Hyosub; Marsh, Daniel;

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YEAR: 2014     DOI:

Equatorial broad plasma depletions associated with the enhanced fountain effect

Lee, Woo; Kil, Hyosub; Kwak, Young-Sil; Paxton, Larry; Zhang, Yongliang; Galkin, Ivan; Batista, Inez;

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

YEAR: 2014     DOI:

The effect of the 135.6 nm emission originated from the ionosphere on the TIMED/GUVI O/N ₂ ratio

The column number density ratio of atomic oxygen to molecular nitrogen (O/N₂\ ratio) provided by the Global Ultraviolet Imager (GUVI) onboard the Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics (TIMED) satellite has been used as a diagnostic of the thermospheric neutral composition. However, a recent study claimed that the GUVI O/N₂\ ratio is not a pure thermospheric parameter in low latitudes during periods of low geomagnetic activity. This study quantifies the O/N₂ ...

Kil, H.; Lee, W.; Shim, J.; Paxton, L.J.; Zhang, Y.;

Published by: Journal of Geophysical Research: Space Physics      Published on: Jan-02-2013

YEAR: 2013     DOI: 10.1029/2012JA018112

The effect of geomagnetic-storm-induced enhancements to ionospheric emissions on the interpretation of the TIMED/GUVI O/N ₂ ratio

[1]\ We examine the consequence of enhanced atomic oxygen (OI) 135.6 nm emissions due to the recombination of O⁺ with electrons on the column number density ratio of atomic oxygen to molecular nitrogen (O/N₂ ratio) provided by Global Ultraviolet Imager (GUVI) on board the Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics satellite. GUVI O/N₂ ratio is derived from the measurements of OI 135.6 nm and N₂ Lyman-Birge-Hopfield airglow emissions. The OI 135.6 nm emissi ...

Lee, Woo; Kil, Hyosub; Paxton, Larry; Zhang, Yongliang; Shim, Ja;

Published by: Journal of Geophysical Research: Space Physics      Published on: 12/2013

YEAR: 2013     DOI: 10.1002/2013JA019132

geomagnetic storm; GUVI O/N2 ratio; ionospheric effect

Are plasma bubbles a prerequisite for the formation of broad plasma depletions in the equatorial F region?

Formation of broad plasma depletions (BPDs) at night in the equatorial F region is understood in association with plasma bubbles. However, we report BPDs that do not show a connection with bubbles. The characteristics of BPDs are investigated using the observations of the Communication/Navigation Outage Forecasting System (C/NOFS) satellite on 31 December 2008, 28 July 2010, and 1 February 2011. On those days, BPDs are detected in the longitude regions where C/NOFS did not detect bubbles prior to the detection of ...

Kil, Hyosub; Lee, Woo;

Published by: Geophysical Research Letters      Published on: 07/2014

YEAR: 2013     DOI: 10.1002/grl.50693

bubbles; Equatorial ionosphere; irregularities

Nightside midlatitude ionospheric arcs: TIMED/GUVI observations

[1]\ Midlatitude arcs (MLA) are the phenomenon of the nightside enhancements of ionospheric electron density at 20\textdegree-45\textdegree magnetic latitudes in both hemispheres. We investigate the occurrence of MLA and its dependence on season using the Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics/Global Ultraviolet Imager (TIMED/GUVI) O I 135.6 nm intensity data between March 2008 and March 2012. The 135.6 nm emission is mainly caused by radiant recombination between O⁺ ions and electron ...

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

Published by: Journal of Geophysical Research: Space Physics      Published on: 06/2013

YEAR: 2013     DOI: 10.1002/jgra.50327

GUVI; Ionosphere; UV imager

Multi-Periodic Auroral and Thermospheric Variations in 2006

Zhang, Yongliang; Paxton, L.; Kil, Hyosub;

Published by: Terrestrial, Atmospheric and Oceanic Sciences      Published on: 04/2013

YEAR: 2013     DOI: 10.3319/TAO.2012.09.20.01(SEC)

Observing the mid-and low-latitude ionosphere-global UV remote sensing

Paxton, LJ; Kil, H; Miller, ES; Comberiate, J; Schaefer, RK; Zhang, Y; Team, GUVI; , others;

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YEAR: 2013     DOI:

Ring current and polar rain auroras

Zhang, Y; Paxton, L; Kil, H;

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YEAR: 2013     DOI:

The Study of the origin of broad plasma depletions in the equatorial F region

Oh, S; Lee, W; Kil, H; Kwak, Y; Paxton, L; Zhang, Y;

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YEAR: 2013     DOI:

Drivers of the hemispheric asymmetry in the low-latitude electron density distribution

Kil, H; Kwak, Y; Lee, W; Paxton, L; Zhang, Y;

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YEAR: 2013     DOI:

Behaviors of the ionospheric and thermospheric disturbances during geomagnetic storms

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

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YEAR: 2013     DOI:

The effect of the 135.6 nm emission originated from the ionosphere on the TIMED/GUVI O/N2 ratio

Kil, H; Lee, WK; Shim, J; Paxton, LJ; Zhang, Y;

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

YEAR: 2013     DOI:

Large-scale structures in the Polar Rain

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

Published by: Geophysical Research Letters      Published on:

YEAR: 2013     DOI:

The effect of geomagnetic-storm-induced enhancements to ionospheric emissions on the interpretation of the TIMED/GUVI O/N2 ratio

Lee, Woo; Kil, Hyosub; Paxton, Larry; Zhang, Yongliang; Shim, Ja;

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

YEAR: 2013     DOI:

A long-lived band of plasma density enhancement at mid-latitudes during the 2003 Halloween magnetic storm

Park, Jaeheung; Lühra, Hermann; Jakowski, Norbert; Gerzen, Tatjana; Kil, Hyosub; Jee, Geonhwa; Xiong, Chao; Min, Kyoung; Noja, Max;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: Jan-05-2012

YEAR: 2012     DOI: 10.1016/j.jastp.2012.03.009

The source of the steep plasma density gradient in middle latitudes during the 11--12 April 2001 storm

A steep plasma density gradient has been observed in the middle-latitude F region during large geomagnetic storms. This phenomenon can be understood as a special form of the middle-latitude ionization trough (hereafter trough), but its causal linkage has not yet been clarified. We investigate the association of the steep density gradient and the trough by comparing their morphologies and occurrence locations using the satellite and ground observation data during the 11\textendash12 April 2001 storm. Steep density ...

Park, S.; Kim, K.-H.; Kil, H.; Jee, G.; Lee, D.-H.; Goldstein, J.;

Published by: Journal of Geophysical Research      Published on: 05/2012

YEAR: 2012     DOI: 10.1029/2011JA017349

geomagnetic storm; plasma trough; steep density gradient

Intense polar rain electrons and associated field aligned currents

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

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YEAR: 2012     DOI:

The Source of Tidal Signatures in the TIMED/GUVI O/N2 Ratio

Kil, H; Lee, W; Shim, J; Paxton, LJ; Zhang, Y;

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YEAR: 2012     DOI:

Persistent longitudinal features in the low-latitude ionosphere

Kil, H; Lee, WK; Kwak, Y-S; Oh, S-J; Paxton, LJ; Zhang, Y;

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

YEAR: 2012     DOI:

The origin of the nonmigrating tidal structure in the column number density ratio of atomic oxygen to molecular nitrogen

Kil, Hyosub; Paxton, L.;

Published by: Geophysical Research Letters      Published on: Jan-10-2011

YEAR: 2011     DOI: 10.1029/2011GL049432

Nightside polar rain aurora boundary gap and its applications for magnetotail reconnection

Zhang, Yongliang; Paxton, L.; Kil, Hyosub;

Published by: Journal of Geophysical Research      Published on: Jan-01-2011

YEAR: 2011     DOI: 10.1029/2011JA016884

O and N ₂ disturbances in the F region during the 20 November 2003 storm seen from TIMED/GUVI

Kil, H.; Kwak, Y.-S.; Paxton, L.; Meier, R.; Zhang, Y.;

Published by: Journal of Geophysical Research      Published on: Jan-01-2011

YEAR: 2011     DOI: 10.1029/2010JA016227

The source of the longitudinal asymmetry in the ionospheric tidal structure

Kil, H.; Kwak, Y.-S.; Oh, S.-J.; Talaat, E.; Paxton, L.; Zhang, Y.;

Published by: Journal of Geophysical Research      Published on: Jan-01-2011

YEAR: 2011     DOI: 10.1029/2011JA016781

Temporal and spatial components in the storm-time ionospheric disturbances

Kil, Hyosub; Paxton, L.; Kim, Khan-Hyuk; Park, Sarah; Zhang, Yongliang; Oh, Seung-Jun;

Published by: Journal of Geophysical Research      Published on: Jan-01-2011

YEAR: 2011     DOI: 10.1029/2011JA016750

Electrified MSTIDs at Low Latitudes

Miller, ES; Kil, H; Makela, JJ; Paxton, LJ; Talaat, ER;

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YEAR: 2011     DOI:

Longitudinal asymmetry in the crest intensity of the ionospheric tidal structure

Kil, H; Paxton, LJ; Zhang, Y; Kwak, Y; Oh, S;

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YEAR: 2011     DOI:

Onset conditions of bubbles and blobs: A case study on 2 March 2009

Kil, H; Choi, H-S; Heelis, RA; Paxton, LJ; Coley, WR; Miller, ES;

Published by: Geophysical Research Letters      Published on:

YEAR: 2011     DOI: 10.1029/2011GL046885

O and N2 disturbances in the F region during the 20 November 2003 storm seen from TIMED/GUVI

Kil, H; Kwak, Y-S; Paxton, LJ; Meier, RR; Zhang, Y;

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

YEAR: 2011     DOI:

Periodic Variations in Aurora, Thermosphere and Ionosphere: Solar Cycle Dependence

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

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YEAR: 2011     DOI:

Causal link of longitudinal plasma density structure to vertical plasma drift and atmospheric tides--A review

Kil, Hyosub; Paxton, Larry;

Published by: Aeronomy of the Earth s Atmosphere and Ionosphere      Published on:

YEAR: 2011     DOI: https://doi.org/10.1007/s12040-011-0114-1

Ionospheric disturbance in the low-latitude region during the magnetic storm of July 15, 2000-Mechanism of the large equatorial plasma density depletions

Kil, Hyosub; Paxton, Larry;

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YEAR: 2011     DOI:

Causal Link of Longitudinal Plasma Density Structure to Vertical Plasma Drift and Atmospheric Tides \textendash A Review

This chapter reviews recent advances in our understanding of the characteristics and driving mechanisms of the longitudinal plasma density structure in the low-latitude F region. Various ionospheric observations have shown the development of a longitudinal wave-like pattern in plasma density. Typically, the wave number-4 (wave-4) pattern is pronounced during July\textendashSeptember, and the wave-3 pattern is pronounced during December\textendashJanuary. Variation of the longitudinal plasma density pattern with l ...

Kil, Hyosub; Paxton, Larry;

Published by:       Published on:

YEAR: 2011     DOI: 10.1007/978-94-007-0326-1_26

The temporal evolution of the large equatorial plasma depletions observed during the 29--30 October 2003 storm

This study investigates the temporal evolution of the large plasma depletions observed by ROCSAT-1 and DMSP near 295°E during the 29–30 October 2003 storm. The presence of a penetration electric field around the detection time of the large plasma depletions is supported by the observation of high upward ion drift velocity and formation of an intense equatorial ionization anomaly in the American sector. However, these ionospheric disturbances occur in broad longitude regions; a short-range polarization electric field may a ...

Kil, Hyosub; Paxton, L.;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: Jan-03-2010

YEAR: 2010     DOI: 10.1016/j.jastp.2009.10.019

Is DE2 the source of the ionospheric wave number 3 longitudinal structure?

Kil, H.; Paxton, L.; Lee, W.; Ren, Z.; Oh, S.-J.; Kwak, Y.-S.;

Published by: Journal of Geophysical Research      Published on: Jan-01-2010

YEAR: 2010     DOI: 10.1029/2010JA015979

On and N2 disturbances in the F region during the 20 November 2003 storm seen from TIMED/GUVI

Kil, Hyosub; Paxton, Larry; Kwak, Young-Sil; Meier, Robert; Zhang, Yongliang;

Published by: 38th COSPAR Scientific Assembly      Published on:

YEAR: 2010     DOI:

The three dimensional characteristics of the equatorial plasma bubbles retrieved from TIMED/GUVI nightglow images

Oh, S; Kil, H; Paxton, LJ;

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YEAR: 2010     DOI:

Seasonal, diurnal, and solar cycle variations of the longitudinal wave structure in the low-latitude thermosphere

Kwak, Y; Kil, H; Lee, W; Cho, K;

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YEAR: 2010     DOI:

Night-side mid-latitude 135.6 nm intensity enhancements: TIMED/GUVI observations

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

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YEAR: 2010     DOI:

Formation of a plasma depletion shell in the equatorial ionosphere

An accurate description of the irregularity region defined by a plasma bubble is critically important in understanding the dynamics of the region and its effects on radio scintillation. Here we describe a plasma depletion region as a \textquotedblleftdepletion shell\textquotedblright and show how two-dimensional optical images from space can be used to define the shape of the depletion shell. Our simple model calculation demonstrates that the space-based optical observation can detect the plasma-depleted magnetic flux tub ...

Kil, Hyosub; Heelis, Roderick; Paxton, Larry; Oh, Seung-Jun;

Published by: Journal of Geophysical Research      Published on: 11/2009

YEAR: 2009     DOI: 10.1029/2009JA014369

Equatorial ionosphere; plasma depletion shell; zonal shear flow

Behavior of the Ionosphere and Thermosphere at Solar Minimum: Data and Model Comparisons and Analysis

Paxton, LJ; Zhang, Y; Kil, H; Schaefer, RK; Comberiate, J; Christensen, AB;

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YEAR: 2009     DOI:

The Variability of the Zonal Plasma Drift in the Equatorial F Region

Kil, H; Kang, C; Oh, S; Kwak, Y; Lee, W; Paxton, LJ;

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YEAR: 2009     DOI:

The One-to-one Comparison of the Pre-reversal Enhancement Characteristics with the Equatorial Plasma Bubble Occurrence using Multiple Satellite Data

Oh, SJ; Kil, H; Kim, YH;

Published by: Bulletin of the Korean Space Science Society      Published on:

YEAR: 2009     DOI:

Spectral analysis of ionospheric electron density and mesospheric neutral wind diurnal nonmigrating tides observed by COSMIC and TIMED satellites

Wu, Quian; Solomon, SC; Kuo, Y-H; Killeen, TL; Xu, JiYao;

Published by: Geophysical research letters      Published on:

YEAR: 2009     DOI:

The day-to-day variability of the occurrence of equatorial plasma bubbles

Oh, Seung; Kil, Hyosub; Paxton, Larry; Kim, Yong;

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YEAR: 2009     DOI:

Global observations of the equatorial ionosphere by UV remote sensing

Paxton, Larry; Comberiate, Joseph; Kil, Hyosub; Schaefer, Robert; Wolven, Brian; Zhang, Yongliang; Morrison, Daniel;

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YEAR: 2009     DOI:

LONGITUDINAL VARIATION OF THE ANNUAL AND HEMISPHERIC ASYMMETRIES OF THE LOW-MIDDLE LATITUDE IONOSPHERE

Kwak, Y; Kil, H; Oh, S; Lee, W; Forbes, JM; Cho, K;

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YEAR: 2009     DOI: