GUVI Biblio | guvitimed.jhuapl.edu

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Found 137 entries in the Bibliography.

Showing entries from 1 through 50

2019

Space Weather Modeling Capabilities Assessment: Auroral Precipitation and High-Latitude Ionospheric Electrodynamics

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

Crowley, Geoff; Azeem, Irfan;

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:

YEAR: 2016 DOI:

Analysis of TIMED/GUVI Dayglow Utraviolet Oxygen Images

Christensen, Andrew; Crowley, Geoff; Meier, Robert;

Published by: Published on:

YEAR: 2016 DOI:

2015

Global ionospheric response to the 2009 sudden stratospheric warming event using Ionospheric Data Assimilation Four-Dimensional (IDA4D) algorithm

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 ...

Pilinski, M.; Crowley, G.;

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

composition; technique; thermosphere

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:

YEAR: 2015 DOI:

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:

YEAR: 2015 DOI:

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:

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:

YEAR: 2015 DOI:

Multisensor profiling of a concentric gravity wave event propagating from the troposphere to the ionosphere

Azeem, Irfan; Yue, Jia; Hoffmann, Lars; Miller, Steven; Straka, William; Crowley, Geoff;

Published by: Geophysical research letters Published on:

YEAR: 2015 DOI:

First Measurements of Ionospheric TEC and GPS Scintillations from an Unmanned Marine Vehicle

Azeem, Irfan; Crowley, Geoff; Reynolds, Adam;

Published by: Published on:

YEAR: 2015 DOI:

Thermal cell structures in the high-latitude thermosphere induced by ion drag

Walterscheid, RL; Crowley, G;

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

YEAR: 2015 DOI:

2014

Interplanetary magnetic field By control of prompt total electron content increases during superstorms

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

Geomagnetic storms; Ionosphere

Seasonal Variability in Global Eddy Diffusion and the Effect on Thermospheric Neutral Density

Pilinski, Marcin; Crowley, Geoff;

Published by: Published on:

YEAR: 2014 DOI:

Ensemble Assimilation Using Three First-Principles Thermospheric Models as a Tool for 72-hour Density and Satellite Drag Forecasts

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:

YEAR: 2014 DOI:

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:

YEAR: 2014 DOI:

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:

YEAR: 2014 DOI:

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:

YEAR: 2013 DOI:

Conjugate High Latitude Measurements along the 40 degree magnetic meridian: Autonomous Adaptive Low-Power Instrument Platforms on the East Antarctic Plateau

Clauer, Robert; Kim, Hyomin; Deshpande, Kshitija; Xu, Zhonghua; Fish, Chad; Musko, Steve; Crowley, Geoff; Humphreys, Todd; Bhatti, Jahshan; Bust, Grary;

Published by: Published on:

YEAR: 2013 DOI:

2012

Characteristics of traveling ionospheric disturbances observed by the TIDDBIT sounder

Crowley, Geoff; Rodrigues, FS;

Published by: Radio Science Published on:

YEAR: 2012 DOI:

Parameterization of the ion convection and the auroral oval in the NCAR thermospheric general circulation models

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:

YEAR: 2012 DOI:

Tutorial: The Neutral Atmosphere and the Satellite Drag Environment

Crowley, Geoff; Pilinski, Marcin; Azeem, Irfan;

Published by: Advances in the Astronautical Sciences Published on:

YEAR: 2012 DOI:

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:

YEAR: 2012 DOI:

2011

Studies of ionospheric F-region response in the Latin American sector during the geomagnetic storm of 21--22 January 2005

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

Effects of geomagnetic super storms on the ionospheric F-region in the South American sector using a GPS technique: A review

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:

YEAR: 2011 DOI:

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:

YEAR: 2011 DOI:

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;

Published by: Published on:

YEAR: 2011 DOI:

Ion Temperature Distribution in the High-Latitude Region (EISCAT UHF Radar Observations). What is the Field-aligned Currents Influence?

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:

YEAR: 2011 DOI:

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:

YEAR: 2010 DOI:

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:

YEAR: 2010 DOI:

Periodic spacing between consecutive equatorial plasma bubbles

Makela, Jonathan; Vadas, SL; Muryanto, R; Duly, T; Crowley, G;

Published by: Geophysical Research Letters Published on:

YEAR: 2010 DOI:

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:

YEAR: 2010 DOI:

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:

YEAR: 2010 DOI:

Seasonal variations in ionospheric F-region parameters during the low solar activity period in the Brazilian sector and comparison with ionospheric models

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:

YEAR: 2010 DOI:

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:

YEAR: 2010 DOI:

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:

YEAR: 2009 DOI:

Large-scale instabilities of the lower thermosphere during an active period

Walterscheid, RL; Crowley, G;

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