| 2016 |
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TIME after TIMED-A perspective on Thermosphere-Ionosphere Mesosphere science and future observational needs after the TIMED mission epoch
Mlynczak, Martin; , Russell; Hunt, Linda; Christensen, Andrew; Paxton, Larry; Woods, Thomas; Niciejewski, Richard; Yee, Jeng-Hwa;
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YEAR: 2016 DOI:
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Spatial and Temporal Variability of Atomic Oxygen in The Mesosphere And Lower Thermosphere
Yee, Jeng-Hwa; , Russell; Mlynczak, Martin; Christensen, Andrew; Paxton, Larry; Zhang, Yongliang; Skinner, Wilbert; Woods, Thomas;
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YEAR: 2016 DOI:
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Analysis of TIMED/GUVI Dayglow Utraviolet Oxygen Images
Christensen, Andrew; Crowley, Geoff; Meier, Robert;
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YEAR: 2016 DOI:
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| 2015 |
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A new technique for remote sensing of O 2 density from 140 to 180 km
Observations of molecular oxygen are difficult to make in the Earth\textquoterights atmosphere between 140 and 200 km altitude. Perhaps the most accurate measurements to date have been obtained from satellite instruments that measure solar occultations of the limb. These do provide height-resolved O2 density measurements, but the nature of this technique is such that the temporal/spatial distribution of the measurements is uneven. Here a new space-based technique is described that utilizes two bright dayglow em ...
Hecht, James; Christensen, Andrew; Yee, Jeng-Hwa; Crowley, Geoff; Bishop, Rebeeca; Budzien, Scott; Stephan, Andrew; Evans, Scott;
Published by: Geophysical Research Letters Published on: 01/2015
YEAR: 2015 DOI: 10.1002/2014GL062355
composition; technique; thermosphere
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Remote sensing of Earth's 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
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A new technique for remote sensing of O2 density from 140 to 180 km
Hecht, James; Christensen, Andrew; Yee, Jeng-Hwa; Crowley, Geoff; Bishop, Rebeeca; Budzien, Scott; Stephan, Andrew; Evans, Scott;
Published by: Geophysical Research Letters Published on:
YEAR: 2015 DOI:
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| 2013 |
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The quiet nighttime low-latitude ionosphere as observed by TIMED/GUVI
In this paper, we examine the nighttime ionosphere climatology structure in the low latitude region and discrepancies between Global Ultraviolet Imager (GUVI) observations and the IRI model predictions using (1) the magnetic zonal mean of electron number density as a function of altitude and magnetic latitude, (2) vertical electron density profiles at various levels of F10.7 index, (3) nighttime descent and magnitude decrease of the ionosphere, (4) point-to-point comparisons of F-peak height (hmF2) and density (NmF2), and ...
Talaat, E.R.; Yee, J.-H.; Hsieh, S.-Y.; Paxton, L.J.; DeMajistre, R.; Christensen, A.B.; Bilitza, D.;
Published by: Advances in Space Research Published on: 02/2013
YEAR: 2013 DOI: 10.1016/j.asr.2012.11.012
Electron density; GUVI; Ionosphere; IRI; TIMED
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Rapid, highly structured meridional winds and their modulation by non migrating tides: Measurements from the Streak mission
[1]\ Measurements of the Earth\textquoterights low latitude thermosphere returned by the ionization gauge on the Streak mission are reported and discussed. The measurements are of the amount of gas rammed into the sensor by its passage through the thermospheric medium. They were obtained in the dusk sector in the altitude range 130\textendash330 km and are shown to be strongly structured by the geomagnetic field. Similarities to the structure of the equatorial ionization anomaly are discussed. The structure is interp ...
Clemmons, J.; Walterscheid, R.; Christensen, A.; Bishop, R.;
Published by: Journal of Geophysical Research: Space Physics Published on: 02/2013
YEAR: 2013 DOI: 10.1029/2012JA017661
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| 2011 |
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A study of space shuttle plumes in the lower thermosphere
Meier, R.; Stevens, Michael; Plane, John; Emmert, J.; Crowley, G.; Azeem, I.; Paxton, L.; Christensen, A.;
Published by: Journal of Geophysical Research Published on: Jan-01-2011
YEAR: 2011 DOI: 10.1029/2011JA016987
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Remote Sensing of lower thermospheric temperature and composition based on observations of O2 Atmospheric band emission.
Christensen, AB; Yee, J; Budzien, SA; Bishop, RL; Hecht, JH; Stephan, AW; Crowley, G;
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YEAR: 2011 DOI:
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Ten Years of GUVI Data: The Updated GUVI Far UV Data Archive
Wolven, B; Schaefer, R; Paxton, L; Holland, D; Zhang, Y; Christensen, A;
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YEAR: 2011 DOI:
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| 2010 |
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Can molecular diffusion explain Space Shuttle plume spreading?
Meier, R.; Plane, John; Stevens, Michael; Paxton, L.; Christensen, A.; Crowley, G.;
Published by: Geophysical Research Letters Published on: Jan-04-2010
YEAR: 2010 DOI: 10.1029/2010GL042868
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Dynamical Properties of Shuttle Plumes in the Lower Thermosphere
Meier, RR; Stevens, MH; Plane, JM; Emmert, JT; Crowley, G; Paxton, LJ; Christensen, AB; Azeem, SI;
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YEAR: 2010 DOI:
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A Statistical Nighttime Analysis of the Equatorial Ionization Anomaly
Suresh, P; Swenson, C; Christensen, AB;
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YEAR: 2010 DOI:
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| 2009 |
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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:
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The Remote Atmospheric and Ionospheric Detection System on the ISS: Sensor performance and space weather applications from the extreme to the near ultraviolet
Stephan, Andrew; Budzien, Scott; Bishop, Rebecca; Straus, Paul; Christensen, Andrew; Hecht, James; Van Epps, Zachary;
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YEAR: 2009 DOI:
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Global Ultra-Violet Ionosphere-Thermosphere Observatory (GUVITO)
Curtis, N; Crowley, G; Christensen, AB; Paxton, LJ; Robichaud, J; Barry, MA; Bust, GS;
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YEAR: 2009 DOI:
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Near Infrared Spectroscopy and Photometry of the Thermosphere from the RAIDS Experiment on the International Space Station
Christensen, AB; Bishop, RL; Budzien, SA; Hecht, JH; Stephan, AW; Straus, PR; van Epps, Z;
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YEAR: 2009 DOI:
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| 2008 |
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Periodic modulations in thermospheric composition by solar wind high speed streams
Crowley, G.; Reynolds, A.; Thayer, J.; Lei, J.; Paxton, L.; Christensen, A.; Zhang, Y.; Meier, R.; Strickland, D.;
Published by: Geophysical Research Letters Published on: Jan-01-2008
YEAR: 2008 DOI: 10.1029/2008GL035745
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GUVI observations of the ionosphere during the declining phase of the solar cycle
Paxton, LJ; Comberiate, J; Zhang, Y; Kil, H; Christensen, A;
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YEAR: 2008 DOI:
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Aeronomy science based on NASA TIMED/GUVI ultraviolet images of the Earth
Christensen, Andrew; Craven, John; Crowley, Geoff; Meier, Robert; Paxton, Larry;
Published by: 37th COSPAR Scientific Assembly Published on:
YEAR: 2008 DOI:
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Lower Atmosphere Wave Effects on Ionospheric Variability
Talaat, Elsayed; Yee, Jeng-Hwa; Paxton, Larry; DeMajistre, Robert; Christensen, Andrew; Mlynczak, MG; , Russell; Zhu, Xun; Sotirelis, Thomas; Kil, Hyosub;
Published by: 37th COSPAR Scientific Assembly Published on:
YEAR: 2008 DOI:
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Features of annual and semiannual variations derived from the global ionospheric maps of total electron content
Zhao, B; Wan, W; Liu, L; Mao, T; Ren, Z; Wang, M; Christensen, AB;
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YEAR: 2008 DOI:
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Observations of the Day to Night transition of Equatorial Ionization Anomaly
Swenson, CM; Burr, S; Shankar, J; Paxton, L; Christensen, A;
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YEAR: 2008 DOI:
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| 2007 |
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Constraining and validating the Oct/Nov 2003 X-class EUV flare enhancements with observations of FUV dayglow and E -region electron densities
Strickland, D.; Lean, J.; Daniell, R.; Knight, H.; Woo, W.; Meier, R.; Straus, P.; Woods, T.; Eparvier, F.; McMullin, D.; Christensen, A.; Morrison, D.; Paxton, L.;
Published by: Journal of Geophysical Research Published on: Jan-01-2007
YEAR: 2007 DOI: 10.1029/2006JA012074
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Features of annual and semiannual variations derived from the global ionospheric maps of total electron content
Zhao, B.; Wan, W.; Liu, L.; Mao, T.; Ren, Z.; Wang, M.; Christensen, A.;
Published by: Annales Geophysicae Published on: Jan-01-2007
YEAR: 2007 DOI: 10.5194/angeo-25-2513-2007
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The Response of the Thermosphere and Ionosphere to Magnetospheric Inputs as Determined from LEO UV Remote Sensing Measurements-Model/Data Comparisons
Paxton, LJ; Zhang, Y; Ridley, A; Christensen, A; DeMajistre, R; Schaefer, R; Morrison, D;
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YEAR: 2007 DOI:
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GUVI limb observations of the Equatorial Ionization Anomaly
Shankar, Jaya; Burr, Steve; Swenson, C; Christensen, Andy; Paxton, L; Moon, T;
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YEAR: 2007 DOI:
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Thermospheric O/N2 in the Sunlit Disk From More Than Five Years of GUVI/TIMED Observations
Craven, JD; Christensen, AB; Paxton, LJ;
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YEAR: 2007 DOI:
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Inter-annual and long-term variations observed in the ITM system
Talaat, ER; Yee, J; Ruohoniemi, JM; Zhu, X; DeMajistre, R; Russell, J; Mlynczak, M; Paxton, L; Christensen, A;
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YEAR: 2007 DOI:
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The low-latitude ionosphere as observed by TIMED/GUVI and TOPEX/Jason and comparisons with the IRI model
Hsieh, SW; Talaat, ER; Bilitza, D; DeMajistre, R; Paxton, L; Christensen, A; Yee, J;
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YEAR: 2007 DOI:
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| 2006 |
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Global thermosphere-ionosphere response to onset of 20 November 2003 magnetic storm
Crowley, G.; Hackert, C.; Meier, R.; Strickland, D.; Paxton, L.; Pi, X.; Mannucci, A.; Christensen, A.; Morrison, D.; Bust, G.; Roble, R.; Curtis, N.; Wene, G.;
Published by: Journal of Geophysical Research Published on: Jan-01-2006
YEAR: 2006 DOI: 10.1029/2005JA011518
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TIMED Contributions to Mesosphere, Lower Thermosphere, and Ionosphere Science-A10S16 Thermospheric density 2002-2004: TIMED/GUVI dayside limb observations and satellite drag
Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Christensen, AB;
Published by: Journal of Geophysical Research Published on:
YEAR: 2006 DOI: 10.1029/2005JA011495
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Seasonal patterns in exospheric temperature: TIMED/GUVI versus NRLMSIS
Stephan, AW; Meier, RR; Christensen, AB; Paxton, LJ;
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YEAR: 2006 DOI:
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Thermospheric O/N2 ratio observations obtained over more than four years with the GUVI instrument in the TIMED spacecraft mission
Craven, JD; Christensen, AB; Paxton, LJ; Strickland, DJ;
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YEAR: 2006 DOI:
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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;
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YEAR: 2006 DOI:
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Analyses of solar activity effects on the low-latitude ionosphere
Wolven, BC; Talaat, ER; Yee, J; DeMajistre, R; Paxton, LJ; Christensen, A; Sotirelis, T; Smith, DC; Bilitza, D; Azeem, I;
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YEAR: 2006 DOI:
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GUVI Observations of Thermosphere/Ionosphere Coupling
Paxton, L; Zhang, Y; Kil, H; Morrison, D; Wolven, B; Meng, C; Christensen, A;
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YEAR: 2006 DOI:
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The effects of solar activity on the low-latitude ionosphere as observed from space
Talaat, ER; Yee, J-H; DeMajistre, R; Paxton, LJ; Christensen, A; Sotirelis, T; Smith, DC; Bilitza, D;
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YEAR: 2006 DOI:
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Thermospheric density 2002–2004: TIMED/GUVI dayside limb observations and satellite drag
We use TIMED/GUVI dayside limb observations of thermospheric far ultraviolet (FUV) dayglow to infer height profiles of total mass density during the period 2002–2004. We compare these data with total mass density derived from drag-induced changes in the orbits of satellites with perigee heights ranging from 200 to 600 km. To accommodate sampling differences, we compute the ratio of observed total mass density, filtered on a 3-day timescale, to that predicted by the NRLMSISE-00 empirical model. The GUVI densities are in goo ...
Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Christensen, AB;
Published by: Journal of Geophysical Research: Space Physics Published on:
YEAR: 2006 DOI: https://doi.org/10.1029/2005JA011495
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Comparison of Conductances derived from IDA3D and TIMEGCM with GUVI
Reynolds, AS; Crowley, GW; Bust, GS; Paxton, L; Christensen, A; Secan, J; Smith, R;
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YEAR: 2006 DOI:
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Comparison of GUVI 135.6 nm OI radiance observations with outputs from global atmospheric models
Shankar, Jaya; Swenson, CM; Crowley, G; Coakley, H; Moon, TK; Paxton, LJ; Christensen, AB;
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YEAR: 2006 DOI:
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Effect of 27-day Solar Rotation on Thermospheric Density and Composition
Crowley, G; Meier, B; Tapley, B; Bettadpur, S; Cheng, M; Ries, J; Abusali, P; Paxton, L; Christensen, A;
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YEAR: 2006 DOI:
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Lower Atmosphere Effects on Thermospheric and Ionospheric Variability
Talaat, ER; Yee, J; Paxton, L; DeMajistre, R; Christensen, A; Russell, J; Mlynczak, M; Zhu, X; Sotirelis, T; Smith, D;
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YEAR: 2006 DOI:
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Thermospheric density 2002—2004: TIMED/GUVI dayside limb observations and satellite drag
Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Christensen, AB;
Published by: Journal of Geophysical Research: Space Physics Published on:
YEAR: 2006 DOI:
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| 2005 |
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Morphology of the equatorial anomaly and equatorial plasma bubbles using image subspace analysis of Global Ultraviolet Imager data
Henderson, S.; Swenson, C.; Christensen, A.; Paxton, L.;
Published by: Journal of Geophysical Research Published on: Jan-01-2005
YEAR: 2005 DOI: 10.1029/2005JA011080
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First look at the 20 November 2003 superstorm with TIMED/GUVI: Comparisons with a thermospheric global circulation model
The NASA TIMED/GUVI experiment obtained unprecedented far ultraviolet images of thermospheric composition and temperature during the intense geomagnetic storm on 20\textendash21 November 2003. Geographic maps of the atomic oxygen to molecular nitrogen column density ratio show severe depletions that extend to the equator near the peak of the storm. This ratio is a key indicator of how the thermospheric composition is disrupted at high latitudes and how the perturbed air moves globally as a result of dynamical forcing. For ...
Meier, R.; Crowley, G.; Strickland, D.; Christensen, A.; Paxton, L.; Morrison, D.; Hackert, C.;
Published by: Journal of Geophysical Research Published on: 09/2005
YEAR: 2005 DOI: 10.1029/2004JA010990
dayglow; geomagnetic storm; GUVI; remote sensing; thermospheric composition; TIMED
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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
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Remote Sensing Observations of Thermospheric Composition Changes: Disk and Limb Observations and Interpretation
Paxton, LJ; Zhang, Y; Meier, R; Strickland, D; Christensen, A; Crowley, G; Kozyra, J;
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YEAR: 2005 DOI:
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Day Side Observations of the Equatorial Anomaly
Coakley, H; Swenson, CM; Moon, T; Meier, RR; Paxton, L; Christensen, A;
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YEAR: 2005 DOI:
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