Notice:
|
Found 68 entries in the Bibliography.
Showing entries from 1 through 50
2019 |
Response of ionosphere over Korea and adjacent areas to 17 March 2015 geomagnetic storm Published by: Advances in Space Research Published on: 07/2019 YEAR: 2019   DOI: 10.1016/j.asr.2019.03.038 |
Assimilation of Multiple Data Types to a Regional Ionosphere Model With a 3D-Var Algorithm (IDA4D) For the purpose of building a regional (bound 20\textendash60\textdegreeN in latitude and 110\textendash160\textdegreeE in longitude) ionospheric nowcast model, we investigated the performance of IDA4D (Ionospheric Data Assimilation Four-Dimension) technique considering International Reference Ionosphere model as the background. The data utilized in assimilation were slant total electron content (STEC) from 27 ground GPS (Global Positioning System) receiver stations and NmF2 (ionospheric F2 peak density) from five ionoson ... Mengist, Chalachew; Ssessanga, Nicholas; Jeong, Se-Heon; Kim, Jeong-Heon; Kim, Yong; Kwak, Young-Sil; Published by: Space Weather Published on: 06/2019 YEAR: 2019   DOI: 10.1029/2019SW002159 |
2018 |
Improving modeling of the ionosphere-thermosphere (IT) energy budget is important for correct representation of the IT system and physics-based space weather forecasting. We present a framework for estimation of the IT energy budget with the physics-based Global Ionosphere-Thermosphere Model (GITM), empirical models and observations. The approach is illustrated for the 16-19 March 2013 and 2015 geomagnetic storms. Solar wind data, F10.7, OVATION Prime model and the Weimer 2005 model are utilized to drive GITM. We focus on co ... Verkhoglyadova, Olga; Meng, Xing; Mannucci, Anthony; Mlynczak, Martin; Hunt, Linda; Lu, Gang; Published by: 2018 Triennial Earth-Sun Summit (TESS Published on: |
Observational aspects of the IT energy budget at the multi-scales
Verkhoglyadova, OP; Meng, X; Mannucci, AJ; McGranaghan, R; Published by: Published on: |
2017 |
The ionosphere-thermosphere (IT) energy partitioning for the interplanetary coronal mass ejection (ICME) storms of 16\textendash19 March 2013 and 2015 is estimated with the Global Ionosphere-Thermosphere Model (GITM), empirical models and proxies derived from in situ measurements. We focus on auroral heating, Joule heating, and thermospheric cooling. Solar wind data, F10.7, OVATION Prime model and the Weimer 2005 model are used to drive GITM from above. Thermospheric nitric oxide and carbon dioxide coo ... Verkhoglyadova, O.; Meng, X.; Mannucci, A.; Mlynczak, M.; Hunt, L.; Lu, G.; Published by: Space Weather Published on: 08/2017 YEAR: 2017   DOI: 10.1002/swe.v15.910.1002/2017SW001650 |
2016 |
Sparse Hierarchical Nonparametric Bayesian learning for light field representation and denoising In this paper, we present a sparse hierarchical non-parametric Bayesian (SHNB) model, which is used to represent the data captured by the light field cameras. Specifically, a light field can be represented as a set of sub-aperture views. In order to capture the visual variations of these viewpoints, we propose the so-called \textquotedblleftdepth flow\textquotedblright features. Then based on the depth flow features, we model these views statistically with a sparse representation in a fully unsupervised manner. While loca ... Sun, Xing; Meng, Nan; Xu, Zhimin; Lam, Edmund; So, Hayden; Published by: Published on: YEAR: 2016   DOI: 10.1109/IJCNN.2016.7727617 |
Heliosphere-ionosphere-thermosphere coupling and energy budget in geomagnetic storms 1. Solar irradiance: F10. 7 2. High-latitude electric and magnetic field potential patterns and field-aligned currents (FAC): empirical Weimer05 model (Weimer, 2005), can use AMIE input Verkhoglyadova, OP; Mannucci, AJ; Meng, X; Komjathy, A; Mlynczak, MG; Hunt, LA; Tsurutani, BT; Published by: Published on: |
2009 |
Does the polar cap disappear under an extended strong northward IMF?
Zhang, Yongliang; Paxton, Larry; Newell, Patrick; Meng, Ching-I; Published by: Journal of atmospheric and solar-terrestrial physics Published on: |
2006 |
Observing the Coupled Ionosphere-Thermosphere System: From Solar Maximum to Solar Minimum and Beyond
Paxton, L; Morrison, D; Zhang, Y; Kil, H; Wolven, B; Comberiate, J; Meng, C; Kozyra, J; Christensen, A; Published by: Published on: |
GUVI Observations of Thermosphere/Ionosphere Coupling
Paxton, L; Zhang, Y; Kil, H; Morrison, D; Wolven, B; Meng, C; Christensen, A; Published by: Published on: |
2005 |
Undulations on the equatorward edge of the diffuse proton aurora: TIMED/GUVI observations Undulations on the equatorward edge of the diffuse proton aurora have been identified by using TIMED/GUVI auroral images in the far ultraviolet wavelengths. While undulations have been previously reported on the duskside (Lui et al., 1982), GUVI observations show the undulation also occurs in the dayside, nightside, and morningside. The GUVI proton auroral images provide direct optical evidence that the undulations occur in the proton aurora. It is also the first detection of the undulation in the dayside indicating stron ... Zhang, Y.; Paxton, L.; Morrison, D.; T. Y. Lui, A.; Kil, H.; Wolven, B.; Meng, C.-I.; Christensen, A.; Published by: Journal of Geophysical Research Published on: 09/2005 YEAR: 2005   DOI: 10.1029/2004JA010668 auroral undulation; K-H instability; Magnetic storm; plasma convection |
GUVI Observations of Solar EUV and Geomagnetic Storm Control of the Ionosphere and Thermosphere
Paxton, LJ; Yee, J; Zhang, Y; Kil, H; DeMajistre, R; Morrison, D; Wolven, B; Meng, C; Published by: Published on: |
Auroral Undulations During Magnetic Storms: TIMED/GUVI Observations
Zhang, Y; Paxton, LJ; Morrison, D; Lui, T; Kil, H; Wolven, B; Meng, CI; Published by: Published on: |
The coincident TIMED/Global Ultraviolet Imager (TIMED/GUVI) optical and DMSP particle observations have revealed new features of the optical signature of the polar cusp under a southward interplanetary magnetic field (IMF). We have found that cusp auroras usually take the shape of a thin arc with a width around 100\textendash200 km. This provides the first far-ultraviolet evidence of the narrow cusp under a southward IMF [
Zhang, Y; Meng, C-I; Paxton, LJ; Morrison, D; Wolven, B; Kil, H; Newell, P; Wing, S; Christensen, AB; Published by: Journal of Geophysical Research: Space Physics (1978\textendash2012) Published on: YEAR: 2005   DOI: 10.1029/2004JA010707 |
Imaging the Low-Latitude Ionosphere: Future Collaborations with C/NOFS
Paxton, L.; Kil, H.; DeMajistre, R.; Zhang, Y.; Morrison, D.; Wolven, B.; Meng, C.-I; Published by: Published on: |
TIMED/GUVI Observations of the Ionosphere and Thermosphere Interaction
Paxton, L.; Kil, H.; DeMajistre, R.; Zhang, Y.; Morrison, D.; Wolven, B.; Meng, C.-I.; Published by: Ann. Geophys., special ISEA Published on: |
Paxton, LJ; Kozyra, J; Demajistre, B; Kil, H; Morrison, D; Wolven, B; Mitchell, D; Brandt, P; Zhang, Y; Meng, C; Published by: Published on: |
2004 |
O/N 2 changes during 1--4 October 2002 storms: IMAGE SI-13 and TIMED/GUVI observations Thermospheric O/N2 column density ratios referenced at a N2 column density of 1017 cm-2 are obtained using the IMAGE SI-13 and TIMED/GUVI far-ultraviolet (FUV) dayglow data, AURIC simulation results, and MSIS86 model. Each of the magnetic storms occurring during a 4-day period (1\textendash4 October 2002) caused significant O/N2 depletion that was detected by both of the IMAGE SI-13 and GUVI instruments. The depletion extended down to latitudes of 10\textdegree and -5 ... Zhang, Y.; Paxton, L.; Morrison, D.; Wolven, B.; Kil, H.; Meng, C.-I.; Mende, S.; Immel, T.; Published by: Journal of Geophysical Research Published on: 10/2004 YEAR: 2004   DOI: 10.1029/2004JA010441 |
Double dayside detached auroras: TIMED/GUVI observations On August 19, 2003, TIMED/GUVI detected, for the first time, two separated (double) dayside detached auroras (D-DDA) simultaneously in all the GUVI channels, 121.6 nm, 135.6 nm, LBHS, and LBHL. The D-DDA was located at magnetic latitudes around -57\textdegree and -63\textdegree (L shell 3.4 and 4.9) in the 0900\textendash1030 MLT region. The high-latitude part of the D-DDA is much brighter than the low-latitude part. DMSP particle observation indicates that the source of the D-DDA is energetic (\~10 keV) precipitating pro ... Zhang, Y.; Paxton, L.; Meng, C.-I.; Morrison, D.; Wolven, B.; Kil, H.; Christensen, A.; Published by: Geophysical Research Letters Published on: 05/2004 YEAR: 2004   DOI: 10.1029/2003GL018949 |
GUVI: a hyperspectral imager for geospace The Global Ultraviolet Imager (GUVI) is an imaging spectrometer on the NASA TIMED spacecraft which was launched on December 7, 2001. This instrument produces a far ultraviolet (FUV) data cube of spatial and spectral information at each step of a scan mirror - that scan mirror covers 140 deg in the cross track direction - a span that includes on limb. GUVI produces simultaneous monochromatic images at five "colors" (121.6 nm, 130.4 nm, 135.6 nm, and in broader bands at 140-150 nm and 165-180 nm) as its field of view is sca ... Paxton, L.; Christensen, Andrew; Morrison, Daniel; Wolven, Brian; Kil, Hyosub; Zhang, Yongliang; Ogorzalek, Bernard; Humm, David; Goldsten, John; DeMajistre, Robert; Meng, Ching-I.; Published by: Published on: YEAR: 2004   DOI: 10.1117/12.579171 |
2003 |
The use of far ultraviolet remote sensing to monitor space weather This paper discusses the connection between changes in Earth\textquoterights thermosphere and ionosphere induced by changes in the Earth\textquoterights local space environment (or \textquotedblleftspace weather\textquotedblright) and the phenomena observed in far ultraviolet images of the Earth. Two new experiments, the Global Ultraviolet Imager (GUVI) and the Special Sensor Ultraviolet Imager (SSUSI), will provide a new capability for monitoring changes in thermospheric composition and ionospheric density as they change ... Paxton, L.; Morrison, Daniel; Strickland, Douglas; McHarg, M.Geoff; Zhang, Yongliang; Wolven, Brian; Kill, Hyosub; Crowley, Geoff; Christensen, Andrew; Meng, Ching-I; Published by: Advances in Space Research Published on: Jan-01-2003 YEAR: 2003   DOI: 10.1016/S0273-1177(02)00886-4 |
F-Region Plasma Distribution seen from TIMED/GUVI and its Effect on the Equatorial Spread F Activity
Kil, H; DeMajistre, R; Paxton, L; Zhang, Y; Wolven, B; Morrison, D; Meng, C; Published by: Published on: |
The Sun-Earth Connection as Viewed from GUVI on TIMED
Paxton, L; Christensen, A; Avery, S; Craven, J; Crowley, G; Meier, R; Meng, C; Srickland, D; Swenson, C; Walterscheid, R; , others; Published by: Published on: |
Craven, JD; Strickland, DJ; Meier, RR; Crowley, G; Christensen, AB; Paxton, LJ; Morrison, D; Avery, SK; Meng, C; Straus, PR; , others; Published by: Published on: |
Paxton, LJ; Zhang, Y; Crowley, G; DeMajistre, R; Kil, H; Kusterer, T; Morrison, D; Wolven, B; Meng, C; Christensen, AB; , others; Published by: Published on: |
FUV Spectroscopy of the Dayglow and Aurora from the TIMED/GUVI Sensor
Wolven, B; Morrison, D; Paxton, L; Zhang, Y; Kil, H; Meng, CI; Christensen, AB; Published by: Published on: |
Initial observations with the Global Ultraviolet Imager (GUVI) in the NASA TIMED satellite mission The Global Ultraviolet Imager (GUVI) instrument carried aboard the NASA TIMED satellite measures the spectral radiance of the Earth\textquoterights far ultraviolet airglow in the spectral region from 120 to 180 nm using a cross-track scanning spectrometer design. Continuous operation of the instrument provides images of the Earth\textquoterights disk and limb in five selectable spectral bands. Also, spectra at fixed scanning mirror position can be obtained. Initial results demonstrate the quantitative functionality of the ... Christensen, AB; Paxton, LJ; Avery, S; Craven, J; Crowley, G; Humm, DC; Kil, H; Meier, RR; Meng, C-I; Morrison, D; , others; Published by: Journal of Geophysical Research: Space Physics (1978\textendash2012) Published on: YEAR: 2003   DOI: 10.1029/2003JA009918 airglow; AURORA; ultraviolet; imaging; satellite; atmosphere |
Negative ionospheric storms seen by the IMAGE FUV instrument Data from the IMAGE SI-13 instrument are used to study depletions in the OI 135.6 nm dayglow intensity due to two magnetic storms observed on 8 June and 15 July 2000. Results show that the SI-13 instrument is sensitive to changes in the 135.6 nm dayglow caused by depletion of the O/N2\ column density ratio. It is found that depletion levels in the SI-13 images are weaker than those in the true O/N2\ values or electron density parameters, such as NmF2 (peak F2 electron density) due to the N< ... Zhang, Y.; Paxton, L.J.; Kil, H.; Meng, C.-I.; Mende, S.~B.; Frey, H.~U.; Immel, T.~J.; Published by: Journal of Geophysical Research (Space Physics) Published on: YEAR: 2003   DOI: 10.1029/2002JA009797 Atmospheric Composition and Structure: Airglow and aurora; Atmospheric Composition and Structure: Thermosphere-composition and chemistry; atmospheric composition change; depletion of OI 135.6 nm dayglow; Ionosphere: Ionospheric disturbances; Ionosphere: Plasma temperature and density; Magnetospheric Physics: Storms and substorms; negative ionospheric storms |
Optical Signature of Polar Cusp During Southward IMF Bz Observed by TIMED/GUVI and DMSP The GUVI instrument on board the TIMED satellite provides unique multi-wavelength observations of polar region emissions. In this study we focus on the identification of the polar cusp region during southward IMF conditions. Using simultaneous DMSP particle observations, the optical signatures and dynamics of the polar cusp region are investigated. We will address which of the five GUVI wavelengths can best be used for optical identification of the cusp precipitation by comparing images of various wavelengths. These new G ... Zhang, Y.; Meng, C.~I.; Paxton, L.~J.; Morrison, D.; Wolven, B.; Kil, H.; Newell, P.; Wing, S.; Christensen, A.~B.; Published by: AGU Fall Meeting Abstracts Published on: 2455 Particle precipitation; 2704 Auroral phenomena (2407); 2724 Magnetopause; and boundary layers; cusp |
2002 |
Products Derived From GUVI Dayglow and Auroral Data
Strickland, DJ; Christensen, A; Meier, R; Paxton, L; Morrison, D; Craven, J; Crowley, G; Waltersheid, R; Avery, S; Meng, C; Published by: Published on: |
Global Ultaviolet Imager (GUVI): on-Orbit Performance and Initial Results
Christensen, AB; Strickland, D; Paxton, L; Morrison, D; Crowley, G; Meier, R; Craven, J; Meng, C; Swenson, C; Walterscheid, R; , others; Published by: Published on: |
Craven, JD; Strickland, DJ; Meier, RR; Crowley, G; Christensen, AB; Paxton, LJ; Morrison, D; Avery, SK; Meng, C; Straus, PR; , others; Published by: Published on: |
Meng, CI; Zhang, Y; Paxton, LJ; Newell, PT; Sotirelis, TS; Christensen, AB; Published by: Published on: |
Thermospheric composition derived from TIMED/GUVI limb scans
Meier, RR; Strickland, DJ; Christensen, AB; Paxton, LJ; Morrison, MD; Craven, JD; Crowley, G; Walterscheid, RL; Avery, SK; Meng, CI; Published by: Published on: |
$\$GUVI$\$ Observations of Night Time Ionospheric Morphology
Swenson, CM; Christensen, AB; Walterscheid, RJ; Paxton, LJ; Meng, CI; Craven, JD; Meier, RR; Strickland, DJ; Crowley, G; Published by: Published on: |
The Morphology of Equatorial Plasma Density Depletions Observed by GUVI
Kil, H; Paxton, LJ; Su, S; Wolven, BC; Zhang, Y; Morrison, D; Meng, C; Christensen, AB; Swenson, CM; Crowley, G; , others; Published by: Published on: |
Morrison, D; Sivjee, A; Paxton, L; Zhang, Y; Wolven, B; Kil, H; Meng, C; Christensen, A; Published by: Published on: |
On-Orbit Characterization of the TIMED Global UltraViolet Imager (GUVI)
Wolven, BC; Paxton, LJ; Morrison, D; Humm, DC; Ogorzalek, BS; Kil, H; Zhang, Y; Meng, C; Christensen, A; Published by: Published on: |
Seasonal Variation of Thermospheric Composition as Measured by TIMED/GUVI
Crowley, G; Paxton, LJ; Christensen, AB; Morrison, D; Strickland, DJ; Craven, JD; Meier, R; Straus, P; Walterscheid, R; Meng, C; , others; Published by: Published on: |
Dayside auroras during storms of April 2002: TIMED/GUVI observations
Zhang, Y; Paxton, L; Morrison, D; Wolven, B; Kil, H; Meng, C; Christensen, A; Straus, P; Walterscheid, R; Crowley, G; , others; Published by: Published on: |
Dayglow Imagery and O/N 2 Ratios Observed from the TIMED/GUVI Sensor: An Early Assessment
Morrison, D; Paxton, LJ; Zhang, Y; Wolven, BC; Kil, H; Meng, CI; Christensen, AB; Walterscheid, R; Strickland, D; Published by: Published on: |
Wolven, B; Paxton, L; Morrison, D; Zhang, Y; Kil, H; Meng, C; Christensen, A; Straus, PR; Walterscheid, R; Craven, JD; , others; Published by: Published on: |
Thermospheric Composition: GUVI Observations of O/N2
Christensen, AB; Strickland, DJ; Paxton, LJ; Morrison, D; Crowley, G; Meier, RR; Craven, JD; Meng, CI; Swenson, CM; Walterscheid, RL; , others; Published by: Published on: |
GUVI Instrument Performance: Validation and Evaluation of Ability to Meet Science Objectives
Paxton, LJ; Morrison, D; Wolven, BC; Humm, DC; Ogorzalek, BS; Zhang, Y; Kil, H; Meng, C; Christensen, AB; Published by: Published on: |
Zhang, Y; Paxton, L; Morrison, D; DeMajistre, R; Kusterer, T; Wolven, B; Kil, H; Meng, C; Christensen, A; Published by: Published on: |
On-Orbit Calibration and Characterization of the Global Ultraviolet Imager on TIMED
Paxton, L; Morrison, D; Wolven, B; Kil, H; Humm, D; Ogorzalek, B; Zhang, Y; Meng, C; Christensen, A; Published by: Published on: |
Mapping Changes in Thermospheric Composition
Morrison, D; Paxton, L; Talat, E; Zhang, Y; Kil, H; Meng, C; Christensen, A; , others; Published by: Published on: |
Kil, H; Paxton, L; Zhang, Y; Morrison, D; Wolven, B; Meng, C; Christensen, A; Published by: Published on: |
Morrison, Daniel; Paxton, Larry; Humm, David; Wolven, Brian; Kil, Hyosub; Zhang, Yongliang; Ogorzalek, Bernard; Meng, Ching-I; Published by: Published on: |
Operational sensors are designed and intended to reliably produce the measurements needed to develop high-value key environmental parameters. The Special Sensor Ultraviolet Spectrographic Imager (SSUSI) is slated to fly on the next five Defense Meteorological Satellite Program launches (beginning with the launch of F16 in Fall 2001). SSUSI will routinely produce maps of ionospheric and upper atmospheric composition and image the aurora. In this paper we describe these products and our validation plans and the process thro ... Paxton, L.J.; Morrison, Daniel; Zhang, Yongliang; Kil, Hyosub; Wolven, Brian; Ogorzalek, Bernard; Humm, David; Meng, Ching-I.; Published by: Published on: YEAR: 2002   DOI: 10.1117/12.454268 |
1 2