Bibliography

Response of ionosphere over Korea and adjacent areas to 17 March 2015 geomagnetic storm

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 ionosondes and COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate) Data Analysis Archive Center. The period analyzed covered both geomagnetic quiet and disturbed days (15\textendash18 March 2015). Assimilations were run under the following data combinations (cases): (1) GPS-STEC\textquoterights only; (2) GPS-STEC\textquoterights and NmF2\textquoterights from five ionosondes; (3) only NmF2\textquoterights from five ionosondes; and (4) GPS-STEC\textquoterights and NmF2\textquoterights from both five ionosondes and COSMIC. Results showed that under case 1 the root-mean-square error (RMSE) in STEC reduced by 44\% over the background International Reference Ionosphere values and on averaged over all ionosonde stations in the analysis RMSE values of foF2 (F₂ layer critical frequency) reduced by 21\%. Furthermore, foF2 RMSE values under Case 2 were 36\% smaller than those under Case 1. Under Case 4, IDA4D performance improved even further in areas not covered by GPS and ionosonde measurements. Therefore, IDA4D is a potential candidate for regional ionosphere modeling that exhibits improved performance with assimilation of different data types.

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

Estimation of the ionosphere-thermosphere energy budget during geomagnetic storms with GITM, satellite observations and empirical models

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 contributions to the energy budget from auroral heating, Joule heating, thermospheric nitric oxide (NO) and carbon dioxide (CO2) cooling emissions. Empirical models of auroral hemispheric power based on the TIMED/GUVI measurements and of the Joule heating are used. The cooling emission powers and fluxes are derived from TIMED/SABER measurements.

Verkhoglyadova, Olga; Meng, Xing; Mannucci, Anthony; Mlynczak, Martin; Hunt, Linda; Lu, Gang;

Published by: 2018 Triennial Earth-Sun Summit (TESS      Published on:

YEAR: 2018     DOI:

Observational aspects of the IT energy budget at the multi-scales

Verkhoglyadova, OP; Meng, X; Mannucci, AJ; McGranaghan, R;

Published by:       Published on:

YEAR: 2018     DOI:

Ionosphere-thermosphere energy budgets for the ICME storms of March 2013 and 2015 estimated with GITM and observational proxies

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, F_10.7, OVATION Prime model and the Weimer 2005 model are used to drive GITM from above. Thermospheric nitric oxide and carbon dioxide cooling emission powers and fluxes are estimated from TIMED/SABER measurements. Assimilative mapping of ionospheric electrodynamics (AMIE) estimations of hemispheric power and Joule heating are presented, based on data from global magnetometers, the AMPERE magnetic field data, SSUSI auroral images, and the SuperDARN radar network. Modeled Joule heating and auroral heating of the IT system are mostly controlled by external driving in the March 2013 and 2015 storms, while NO cooling persists into the storm recovery phase. The total heating in the model is about 1000 GW to 3000 GW. Additionally, we intercompare contributions in selected energy channels for five coronal mass ejection-type storms modeled with GITM. Modeled auroral heating shows reasonable agreement with AMIE hemispheric power and is higher than other observational proxies. Joule heating and infrared cooling are likely underestimated in GITM. We discuss challenges and discrepancies in estimating and global modeling of the IT energy partitioning, especially Joule heating, during geomagnetic storms.

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

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 local dictionaries are learned based on each sub-aperture view, all the views with different perspectives share one global dictionary. To show the effectiveness of the proposed model, we apply our model to denoise the light field data. In the experiments, we demonstrate that our method outperforms several state-of-the-art light field denoising approaches.

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:

YEAR: 2016     DOI:

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:

YEAR: 2009     DOI:

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:

YEAR: 2006     DOI:

GUVI Observations of Thermosphere/Ionosphere Coupling

Paxton, L; Zhang, Y; Kil, H; Morrison, D; Wolven, B; Meng, C; Christensen, A;

Published by:       Published on:

YEAR: 2006     DOI:

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 strong convection shear in the region. The undulation in the nightside, a wavy structure in the whole diffuse proton aurora, is significantly different from those in the duskside and dayside. While almost all of the undulation events are observed during magnetic storms (Dst \< -60 nT), one exceptional case shows undulation in the dayside with Dst = 30 nT. However, the case is associated with a large solar wind speed (650 km/s) and a high dynamic pressure (14 nPa). Coincident DMSP SSIES observations suggest that both large ion drift velocity (\>1000 m/s) and strong velocity shear (\>0.1 s^-1) within the diffuse aurora oval are necessary conditions for the undulation to occur. The SSIES data also indicate the areas with large ion drift velocity and shear move to higher latitudes in the MLT sectors toward midnight. This may explain why the undulation is rarely detected in the nightside.

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:

YEAR: 2005     DOI:

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:

YEAR: 2005     DOI:

Far-ultraviolet signature of polar cusp during southward IMF Bz observed by TIMED/Global Ultraviolet Imager and DMSP

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 [Newell and Meng, 1987]. The cusp auroras could extend down to 0800 magnetic local time (MLT) in the morningside and 1400 MLT in the duskside. Its length is about a few thousand kilometers. A large solar wind density, speed, and IMF are necessary conditions for GUVI to observe the cusp aurora. We found that the cusp location at 1200 MLT changes linearly (-10 nT\ B_z\ \< 0 nT) and nonlinearly (B_z\ \< -10 nT) with the IMF\ B_z. The nonlinear effect can be explained by an\ L^-3\ dependence of the Earth\textquoterights equatorial magnetic field.

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

cusp aurora

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:

YEAR: 2005     DOI:

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:

YEAR: 2005     DOI:

Observations of solar and magnetospheric inputs and atmospheric responses to the January 2005 long duration flares and fast coronal mass ejections

Paxton, LJ; Kozyra, J; Demajistre, B; Kil, H; Morrison, D; Wolven, B; Mitchell, D; Brandt, P; Zhang, Y; Meng, C;

Published by:       Published on:

YEAR: 2005     DOI:

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\textdegree in the Northern and Southern Hemispheres, respectively. Simultaneous measurements show an excellent agreement between the SI-13 and GUVI O/N₂ on both global and local scales. The IMAGE SI-13 O/N₂ data provide direct optical evidence that the O/N₂ depletion corotates with the Earth. The GUVI O/N₂ indicate the depletion in both of the hemispheres is not symmetric owing to the seasonal effect and differences in heating and convection induced winds. Both the IMAGE SI-13 and GUVI O/N₂ maps also provide a good opportunity for future modeling efforts.

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

Magnetic storm; thermospheric composition change

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 protons/electrons from the ring current due to the solar wind dynamic pressure enhancements [Zhang et al., 2002] and/or northward turning of the IMF B_z. Observations of the D-DDA provide the first single-event evidence of multiple peaks in the statistical distribution of proton fluxes at energetic around and below 10 keV at low L-shells [Milillo et al., 2001].

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 scanned from horizon to horizon. The instrument consists of a scan mirror feeding a parabolic telescope and Rowland circle spectrometer, with a wedge-and-strip detector at the focal plane. We describe the design, and give an overview of the environmental parameters that will be measured. GUVI is a modified version of the Special Sensor Ultraviolet Spectrographic Imager (SSUSI), which was launched on the DMSP Block 5D3 F16 satellite on October 18, 2003 and is slated to fly on DMSP satellites F17 through F20, as well. We present some results the science analysis of the GUVI data to demonstrate its relevance to the space weather community.

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

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 in response to space weather. These sensors provide a ten-fold improvement in spatial and temporal resolution and a greater than ten-fold improvement in sensitivity over that provided by sensors on the POLAR and IMAGE satellites. These sensors are expected to provide new insights into the mesoscale coupling between the ionosphere and thermosphere, as well as allowing us to develop a better specification of the high latitude convection electric field pattern.

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:

YEAR: 2003     DOI:

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:

YEAR: 2003     DOI:

Search for thermospheric composition changes in the morning sector near local midnight in association with intense substorm activity

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:

YEAR: 2003     DOI:

Space Weather in the ITM: The May-June 2003 Storm and NASA TIMED/GUVI Observations and TIMEGCM Model Results

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:

YEAR: 2003     DOI:

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:

YEAR: 2003     DOI:

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 instrument for studies of the Earth\textquoterights dayglow, aurora, and ionosphere. Moreover, through forward modeling, the abundance of the major constituents of the thermosphere, O, N₂, and O₂\ and thermospheric temperatures can be retrieved from observations of the limb radiance. Variations of the column O/N₂\ ratio can be deduced from sunlit disk observations. In regions of auroral precipitation not only can the aurora regions be geographically located and the auroral boundaries identified, but also the energy flux Q, the characteristic energy E_o, and a parameter f_o\ that scales the abundance of neutral atomic oxygen can be derived. Radiance due to radiative recombination in the ionospheric F region is evident from both dayside and nightside observations of the Earth\textquoterights limb and disk, respectively. Regions of depleted F-region electron density are evident in the tropical Appleton anomaly regions, associated with so-called ionospheric \textquotedblleftbubbles.\textquotedblright Access to the GUVI data is provided through the GUVI website\ www.timed.jhuapl.edu\guvi.

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 N₂\ LBH contribution in the SI-13 intensities. A depletion of -20\% (8 June 2000) and -50\% (15 July 2000) in the SI-13 intensities corresponds to -50\% and -90\% reductions in NmF2, respectively. AURIC simulations indicate that -67\% is the maximum depletion level that can be seen in the SI-13 intensities. The Millstone radar, digisonde and DMSP observations reveal that the electron density depletion extended from the low F-layer altitudes up to 840 km. Owing to the prevailing thermospheric circulation pattern, the depletions cover a wide area (at least 1/8 Earth surface) over the Northern Hemisphere for both of the cases. A deep depletion was always seen first in the morning side and then at later local times. The atmosphere took about 12 hours (8 June case) and more than 24 hours (15 July case) to recover. The results from the SI-13 images are in a good agreement with digisonde, radar, and DMSP observations. The depletion in the SI-13 intensity can be explained by the Joule and particle heating in the high-latitude regions. The heating has two effects: (1) The heated air is nitrogen-rich/oxygen-depleted and (2) a wind surge created by the heating in the night side moves the oxygen-deplete air upward and transports it to lower latitudes together with the neutral wind. Corotation with the Earth brings the oxygen-depleted air to the dayside.

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 GUVI observations suggest that cusp aurora in the FUV extends over a relatively wide MLT range during a large southward IMF Bz. Characteristics and morphology of the cusp auroras in the FUV will also be discussed.

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:

YEAR: 2003     DOI:

2455 Particle precipitation; 2704 Auroral phenomena (2407); 2724 Magnetopause; and boundary layers; cusp

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:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

Search for Thermospheric Composition Changes in the Morning Sector near Local Midnight in Association with Substorm Activity

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:

YEAR: 2002     DOI:

Dynamics of the Auroral and State of the Magnetosphere During Storms of April, 2002: DMSP and TIMED/GUVI Observations

Meng, CI; Zhang, Y; Paxton, LJ; Newell, PT; Sotirelis, TS; Christensen, AB;

Published by:       Published on:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

$\$GUVI$\$ 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:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

Comparison of Global Ultraviolet Imager Observations of Thermospheric Composition Changes to Those Deduced From Ground Observations

Morrison, D; Sivjee, A; Paxton, L; Zhang, Y; Wolven, B; Kil, H; Meng, C; Christensen, A;

Published by:       Published on:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

Thermospheric and Ionospheric Response to the Solar Flares of April 2002 as Observed by the TIMED Global UltraViolet Imager (GUVI)

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:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

Comparison of Auroral Parameters Measured by the Global Ultraviolet Imager to Those Deduced From In Situ and Radar Observations

Zhang, Y; Paxton, L; Morrison, D; DeMajistre, R; Kusterer, T; Wolven, B; Kil, H; Meng, C; Christensen, A;

Published by:       Published on:

YEAR: 2002     DOI:

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:

YEAR: 2002     DOI:

Mapping Changes in Thermospheric Composition

Morrison, D; Paxton, L; Talat, E; Zhang, Y; Kil, H; Meng, C; Christensen, A; , others;

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YEAR: 2002     DOI:

Observation of Ionospheric Weather: Comparison of Global Ultraviolet Imager Data to Ionosondes and Total Electron Content Measurements

Kil, H; Paxton, L; Zhang, Y; Morrison, D; Wolven, B; Meng, C; Christensen, A;

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YEAR: 2002     DOI:

On-orbit calibration of the Special Sensor Ultraviolet Scanning Imager (SSUSI): a far-UV imaging spectrograph on DMSP F-16

Morrison, Daniel; Paxton, Larry; Humm, David; Wolven, Brian; Kil, Hyosub; Zhang, Yongliang; Ogorzalek, Bernard; Meng, Ching-I;

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YEAR: 2002     DOI:

Validation of remote sensing products produced by the Special Sensor Ultraviolet Scanning Imager (SSUSI): a far UV-imaging spectrograph on DMSP F-16

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 through which we can assure our sponsors and data products users of the reliability and accuracy of these products.

Paxton, L.J.; Morrison, Daniel; Zhang, Yongliang; Kil, Hyosub; Wolven, Brian; Ogorzalek, Bernard; Humm, David; Meng, Ching-I.;

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YEAR: 2002     DOI: 10.1117/12.454268