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Found 137 entries in the Bibliography.
Showing entries from 1 through 50
2019 |
As part of its International Capabilities Assessment effort, the Community Coordinated Modeling Center initiated several working teams, one of which is focused on the validation of models and methods for determining auroral electrodynamic parameters, including particle precipitation, conductivities, electric fields, neutral density and winds, currents, Joule heating, auroral boundaries, and ion outflow. Auroral electrodynamic properties are needed as input to space weather models, to test and validate the accuracy of phys ... Robinson, Robert; Zhang, Yongliang; Garcia-Sage, Katherine; Fang, Xiaohua; Verkhoglyadova, Olga; Ngwira, Chigomezyo; Bingham, Suzy; Kosar, Burcu; Zheng, Yihua; Kaeppler, Stephen; Liemohn, Michael; Weygand, James; Crowley, Geoffrey; Merkin, Viacheslav; McGranaghan, Ryan; Mannucci, Anthony; Published by: Space Weather Published on: 01/2019 YEAR: 2019   DOI: 10.1029/2018SW002127 |
2018 |
Extreme ionospheric storms and their effects on GPS systems Given the central importance of Global Positioning System (GPS) to modern society, it is important to consider the effects of extreme ionospheric storms on GPS signals. We Published by: Published on: YEAR: 2018   DOI: 10.1016/B978-0-12-812700-1.00023-6 |
2016 |
RENU 2 UV Measurements of Atomic Oxygen in the Cusp Region
Fritz, Bruce; Lessard, Marc; Paxton, Larry; Cook, Timothy; Lynch, Kristina; Clemmons, James; Hecht, James; Hysell, David; Crowley, Geoff; Published by: Published on: |
Analysis of TIMED/GUVI Dayglow Utraviolet Oxygen Images
Christensen, Andrew; Crowley, Geoff; Meier, Robert; Published by: Published on: |
2015 |
A data assimilation algorithm is used to delineate the time-dependent three-dimensional ionospheric response to the 2009 sudden stratospheric warming (SSW) event. We use the Ionospheric Data Assimilation Four-Dimensional (IDA4D) algorithm to study the global ionospheric response to the 2009 SSW. This is the first study to utilize global ionospheric measurements in a data assimilation framework to unambiguously characterize atmosphere-ionosphere coupling via tidal modifications during the 2009 SSW event. Model results reve ... Azeem, I.; Crowley, G.; Honniball, C.; Published by: Journal of Geophysical Research: Space Physics Published on: 05/2015 YEAR: 2015   DOI: 10.1002/2015JA020993 Atmospheric tides; data assimilation; ionosphere/atmosphere interactions; sudden stratospheric warming |
Seasonal variability in global eddy diffusion and the effect on neutral density We describe a method for making single-satellite estimates of the seasonal variability in global-average eddy diffusion coefficients. Eddy diffusion values as a function of time were estimated from residuals of neutral density measurements made by the Challenging Minisatellite Payload (CHAMP) and simulations made using the thermosphere-ionosphere-mesosphere electrodynamics global circulation model (TIME-GCM). The eddy diffusion coefficient results are quantitatively consistent with previous estimates based on satellite dr ... Published by: Journal of Geophysical Research: Space Physics Published on: 04/2015 YEAR: 2015   DOI: 10.1002/2015JA021084 annual; eddy diffusion; neutral density; satellite drag; seasonal variability; semiannual |
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 |
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 |
Characteristics of extreme geoelectric fields and their possible causes: Localized peak enhancements
Ngwira, Chigomezyo; Pulkkinen, Antti; Bernabeu, Emanuel; Eichner, Jan; Viljanen, Ari; Crowley, Geoff; Published by: Geophysical Research Letters Published on: |
First light from a kilometer-baseline Scintillation Auroral GPS Array
Datta-Barua, S; Su, Y; Deshpande, K; Miladinovich, D; Bust, GS; Hampton, D; Crowley, G; Published by: Geophysical Research Letters Published on: |
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: |
Community-wide model validation study for systematic assessment of ionosphere models
Shim, Ja; Kuznetsova, Maria; Rastaetter, Lutz; Bilitza, Dieter; Bingham, Suzy; Bust, Gary; Calfas, Roy; Codrescu, Mihail; Coster, Anthea; Crowley, Geoff; , others; Published by: Published on: |
Azeem, Irfan; Yue, Jia; Hoffmann, Lars; Miller, Steven; Straka, William; Crowley, Geoff; Published by: Geophysical research letters Published on: |
First Measurements of Ionospheric TEC and GPS Scintillations from an Unmanned Marine Vehicle
Azeem, Irfan; Crowley, Geoff; Reynolds, Adam; Published by: Published on: |
Thermal cell structures in the high-latitude thermosphere induced by ion drag
Published by: Journal of Geophysical Research: Space Physics Published on: |
2014 |
Large magnitude increases in ionospheric total electron content (TEC) that occur over 1\textendash3\ h on the dayside are a significant manifestation of the main phases of superstorms. For the largest superstorms of solar cycle 23 (based on the Dst index), ground networks of GPS receivers measured peak total electron content increases greater than a factor of 2 relative to quiet time TEC averaged over the broad latitude band \textpm40\textdegree for local times 1200\textendash1600\ LT. Near 30\textdegre ... Mannucci, A.J.; Crowley, G.; Tsurutani, B.T.; Verkhoglyadova, O.P.; Komjathy, A.; Stephens, P.; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: 08/2014 YEAR: 2014   DOI: 10.1016/j.jastp.2014.01.001 |
Seasonal Variability in Global Eddy Diffusion and the Effect on Thermospheric Neutral Density
Pilinski, Marcin; Crowley, Geoff; Published by: Published on: |
Hunton, Don; Pilinski, Marcin; Crowley, Geoff; Azeem, I; Fuller-Rowell, Timothy; Matsuo, Tomoko; Fedrizzi, Mariangel; Solomon, Stanley; Qian, Liying; Thayer, Jeffrey; , others; Published by: Published on: |
Topside Ionospheric Sounder for CubeSats
Swenson, C; Pratt, J; Fish, CS; Winkler, C; Pilinski, M; Azeem, I; Crowley, G; Jeppesen, M; Martineau, R; Published by: Published on: |
Space Weather Tools of the Trade-A Changing Mix
Kunches, Joseph; Crowley, Geoff; Pilinski, Marcin; Winkler, Clive; Fish, Chad; Hunton, Don; Reynolds, Adam; Azeem, I; Published by: Published on: |
2013 |
First storm-time plasma velocity estimates from high-resolution ionospheric data assimilation
Datta-Barua, Seebany; Bust, Gary; Crowley, Geoff; Published by: Journal of Geophysical Research: Space Physics Published on: |
Clauer, Robert; Kim, Hyomin; Deshpande, Kshitija; Xu, Zhonghua; Fish, Chad; Musko, Steve; Crowley, Geoff; Humphreys, Todd; Bhatti, Jahshan; Bust, Grary; Published by: Published on: |
2012 |
Characteristics of traveling ionospheric disturbances observed by the TIDDBIT sounder
Crowley, Geoff; Rodrigues, FS; Published by: Radio Science Published on: |
Emery, B; Roble, Raymond; Ridley, Cicely; Richmond, Arthur; Knipp, Delores; Crowley, Geoff; Evans, David; Rich, Frederick; Maeda, Sawako; Published by: NCAR Tech. Note NCAR/TN-491+ STR Published on: |
Tutorial: The Neutral Atmosphere and the Satellite Drag Environment
Crowley, Geoff; Pilinski, Marcin; Azeem, Irfan; Published by: Advances in the Astronautical Sciences Published on: |
Heterogeneous Measurements for Advances in Space Science and Space Weather Forecasting Examples of heterogenous data might include GPS radio occultation limb data and ultraviolet nadir photometry; GUVI/SSUSI cross-track O/N2 maps coupled with SSULI in-track Budzien, Scott; Chua, Damien; Coker, Clayton; Dandenault, Patrick; Dymond, Kenneth; Nicholas, Andrew; Stephan, Andrew; Doe, Richard; Crowley, Geoff; Published by: To emphasize that space weather forecasting with new, full-physics models requires heterogeneous datasets with complementary characteristics—not merely a higher volume of any single data type Published on: |
2011 |
Sahai, Y.; Fagundes, P.; de Jesus, R.; de Abreu, A.; Crowley, G.; Kikuchi, T.; Huang, C.-S.; Pillat, V.; Guarnieri, F.; Abalde, J.; Bittencourt, J.; Published by: Annales Geophysicae Published on: Jan-01-2011 YEAR: 2011   DOI: 10.5194/angeo-29-919-2011 |
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 |
Sahai, Y; De Abreu, AJ; Fagundes, PR; De Jesus, R; Crowley, G; Klimenko, MV; Klimenko, VV; Brunini, C; Gende, M; Pillat, VG; , others; Published by: Asian Journal of Physics Published on: |
The Storm Time Energy and Dynamics Explorers
Swenson, C; Fish, CS; Crowley, G; Earle, GD; Anderson, BJ; Dyrud, LP; Carlson, HC; Erickson, PJ; Fejer, BG; Mertens, CJ; , others; Published by: Published on: |
Christensen, AB; Yee, J; Budzien, SA; Bishop, RL; Hecht, JH; Stephan, AW; Crowley, G; Published by: Published on: |
Teodosiev, Dimitar; Yordanova, Emiliya; Nenovski, Petko; Nikolova, Tatyana; Danov, Dimitar; Crowley, Geoff; Baddeley, Lissa; Buchert, Stefan; Published by: Comptes rendus de l’Acad\ emie bulgare des Sciences Published on: |
2010 |
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 |
Comparison of the Hill\textendashSiscoe polar cap potential theory with the Weimer and AMIE models
Kelley, Michael; Crowley, Geoffrey; Weimer, Daniel; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: Jan-03-2010 YEAR: 2010   DOI: 10.1016/j.jastp.2009.02.011 |
Effects of the Shuttle Plumes on the Chemistry and Energetics of the Lower Thermosphere
Azeem, SI; Crowley, G; Stevens, MH; Meier, RR; Published by: Published on: |
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; Published by: Published on: |
Periodic spacing between consecutive equatorial plasma bubbles
Makela, Jonathan; Vadas, SL; Muryanto, R; Duly, T; Crowley, G; Published by: Geophysical Research Letters Published on: |
On the causes of plasmaspheric rotation variability: IMAGE EUV observations
Galvan, David; Moldwin, Mark; Sandel, Bill; Crowley, Geoff; Published by: Journal of Geophysical Research: Space Physics Published on: |
A comprehensive rocket and radar study of midlatitude spread F
Earle, GD; Bhaneja, P; Roddy, PA; Swenson, CM; Barjatya, Aroh; Bishop, RL; Bullett, TW; Crowley, G; Redmon, R; Groves, K; , others; Published by: Journal of Geophysical Research: Space Physics Published on: |
Sahai, Yogeshwar; de Jesus, Rodolfo; Fagundes, Paulo; de Abreu, Alessandro; Crowley, Geoff; Pillat, Valdir; Guede, Jose; Bittencourt, Jose; Published by: 38th COSPAR Scientific Assembly Published on: |
Evolved Tiny Ionospheric Photometer (ETIP): A sensor for ionospheric specification
Budzien, Scott; Chua, Damien; Coker, Clayton; Dandenault, Patrick; Dymond, Kenneth; Nicholas, Andrew; Doe, Richard; Crowley, Geoff; Published by: To address the requirements for space weather sensors, and includes adequate flexibility for accommodation on a range of future flight opportunities, including microsatellite constellations Published on: |
Comparison of the Hill–Siscoe polar cap potential theory with the Weimer and AMIE models The magnetic storm on November 2004 was characterized by a high solar wind pressure and thus offers a unique opportunity to test the Hill–Siscoe formula (H–S) for the polar cap potential (PCP). To estimate the polar cap potential, we use the Weimer Statistical Convection Model (WCM), and the Assimilative Mapping of Ionospheric Electrodynamics Model (AMIE), based on ingestion of a number of data sets. H–S is in excellent agreement with WCM, and with AMIE during times when DMSP is used in the latter. The implication is t ... Kelley, Michael; Crowley, Geoffrey; Weimer, Daniel; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: YEAR: 2010   DOI: https://doi.org/10.1016/j.jastp.2009.02.011 Magnetic storm; Polar cap potential; Hill–Siscoe formula; solar wind |
2009 |
On the origin of pre-reversal enhancement of the zonal equatorial electric field
Kelley, MC; Ilma, RR; Crowley, G; Published by: Published on: |
Large-scale instabilities of the lower thermosphere during an active period
Published by: Journal of Geophysical Research: Space Physics Published on: |
Physics-Based Modeling of Space Weather in the Ionosphere and Thermosphere
Published by: Published on: |
Sahai, Y; Fagundes, PR; De Jesus, R; De Abreu, AJ; Crowley, G; Pillat, VG; Guarnieri, FL; , Abalde; Bittencourt, JA; Published by: Published on: |
Global Ultra-Violet Ionosphere-Thermosphere Observatory (GUVITO)
Curtis, N; Crowley, G; Christensen, AB; Paxton, LJ; Robichaud, J; Barry, MA; Bust, GS; Published by: Published on: |
2008 |
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 |
Disturbed O/N 2 ratios and their transport to middle and low latitudes
Published by: Washington DC American Geophysical Union Geophysical Monograph Series Published on: |
Mapping the time-varying distribution of high-altitude plasma during storms
Published by: Washington DC American Geophysical Union Geophysical Monograph Series Published on: |