SSUSI Publications

The International Reference Ionosphere \textendash Status 2013

This paper describes the latest version of the International Reference Ionosphere (IRI) model. IRI-2012 includes new models for the electron density and ion densities in the region below the F-peak, a storm-time model for the auroral E-region, an improved electron temperature model that includes variations with solar activity, and for the first time a description of auroral boundaries. In addition, the thermosphere model required for baseline neutral densities and temperatures was upgraded from MSIS-86 to the newer NRLMSI ...

Bilitza, Dieter;

Published by: Advances in Space Research      Published on: 04/2015

YEAR: 2015     DOI: 10.1016/j.asr.2014.07.032

Forecast; Ionosphere; IRI; Real-Time; Space Weather

Methodology of evaluating the science benefit of various satellite/sensor constellation orbital parameters to an assimilative data forecast model

A methodology for evaluating the science benefit of adding space weather sensor data from a modest number of small satellites to the Utah State University Global Assimilation of Ionospheric Measurements\textemdashFull Physics (GAIM-FP) model is presented. Three orbital scenarios are presented, two focusing on improved coverage of narrowly specified regions of interest, and one on global coverage of the ionosphere as a whole. An Observing System Simulation Experiment is used to obtain qualitative and quantitative results o ...

Balthazor, Richard; McHarg, Matthew; Enloe, Lon; Mueller, Brandon; Barnhart, David; Hoeffner, Zachary; Brown, Robert; Scherliess, Ludger; Wilhelm, Lance;

Published by: Radio Science      Published on: 04/2015

YEAR: 2015     DOI: 10.1002/2014RS005426

Ionosphere; modeling

GPS phase scintillation at high latitudes during geomagnetic storms of 7\textendash17 March 2012 \textendash Part 2: Interhemispheric comparison

During the ascending phase of solar cycle 24, a series of interplanetary coronal mass ejections (ICMEs) in the period 7\textendash17 March 2012 caused geomagnetic storms that strongly affected high-latitude ionosphere in the Northern and Southern Hemisphere. GPS phase scintillation was observed at northern and southern high latitudes by arrays of GPS ionospheric scintillation and TEC monitors (GISTMs) and geodetic-quality GPS receivers sampling at 1 Hz. Mapped as a function of magnetic latitude and magnetic local time (ML ...

Prikryl, P.; Ghoddousi-Fard, R.; Spogli, L.; Mitchell, C.; Li, G.; Ning, B.; Cilliers, P.; Sreeja, V.; Aquino, M.; Terkildsen, M.; Jayachandran, P.; Jiao, Y.; Morton, Y.; Ruohoniemi, J.; Thomas, E.; Zhang, Y.; Weatherwax, A.; Alfonsi, L.; De Franceschi, G.; Romano, V.;

Published by: Annales Geophysicae      Published on: 01/2015

YEAR: 2015     DOI: 10.5194/angeo-33-657-2015

Ionosphere; ionospheric disturbance; ionospheric irregularities; polar ionosphere

GPS phase scintillation at high latitudes during geomagnetic storms of 7\textendash17 March 2012 \textendash Part 2: Interhemispheric comparison

During the ascending phase of solar cycle 24, a series of interplanetary coronal mass ejections (ICMEs) in the period 7\textendash17 March 2012 caused geomagnetic storms that strongly affected high-latitude ionosphere in the Northern and Southern Hemisphere. GPS phase scintillation was observed at northern and southern high latitudes by arrays of GPS ionospheric scintillation and TEC monitors (GISTMs) and geodetic-quality GPS receivers sampling at 1 Hz. Mapped as a function of magnetic latitude and magnetic local time (ML ...

Prikryl, P.; Ghoddousi-Fard, R.; Spogli, L.; Mitchell, C.; Li, G.; Ning, B.; Cilliers, P.; Sreeja, V.; Aquino, M.; Terkildsen, M.; Jayachandran, P.; Jiao, Y.; Morton, Y.; Ruohoniemi, J.; Thomas, E.; Zhang, Y.; Weatherwax, A.; Alfonsi, L.; De Franceschi, G.; Romano, V.;

Published by: Annales Geophysicae      Published on: 01/2015

YEAR: 2015     DOI: 10.5194/angeo-33-657-2015

Ionosphere; ionospheric disturbance; ionospheric irregularities; polar ionosphere

GPS phase scintillation at high latitudes during geomagnetic storms of 7\textendash17 March 2012 \textendash Part 2: Interhemispheric comparison

During the ascending phase of solar cycle 24, a series of interplanetary coronal mass ejections (ICMEs) in the period 7\textendash17 March 2012 caused geomagnetic storms that strongly affected high-latitude ionosphere in the Northern and Southern Hemisphere. GPS phase scintillation was observed at northern and southern high latitudes by arrays of GPS ionospheric scintillation and TEC monitors (GISTMs) and geodetic-quality GPS receivers sampling at 1 Hz. Mapped as a function of magnetic latitude and magnetic local time (ML ...

Prikryl, P.; Ghoddousi-Fard, R.; Spogli, L.; Mitchell, C.; Li, G.; Ning, B.; Cilliers, P.; Sreeja, V.; Aquino, M.; Terkildsen, M.; Jayachandran, P.; Jiao, Y.; Morton, Y.; Ruohoniemi, J.; Thomas, E.; Zhang, Y.; Weatherwax, A.; Alfonsi, L.; De Franceschi, G.; Romano, V.;

Published by: Annales Geophysicae      Published on: 01/2015

YEAR: 2015     DOI: 10.5194/angeo-33-657-2015

Ionosphere; ionospheric disturbance; ionospheric irregularities; polar ionosphere

OVATION Prime-2013: Extension of auroral precipitation model to higher disturbance levels

OVATION Prime (OP) is an auroral precipitation model parameterized by solar wind driving. Distinguishing features of the model include an optimized solar wind-magnetosphere coupling function (dΦ_MP/dt) which predicts auroral power significantly better than\ Kpor other traditional parameters, the separation of aurora into categories (diffuse aurora, monoenergetic, broadband, and ion), the inclusion of seasonal variations, and separate parameter fits for each magnetic latitude (MLA ...

Newell, P.; Liou, K.; Zhang, Y.; Sotirelis, T.; Paxton, L.; Mitchell, E.;

Published by: Space Weather      Published on: Jan-06-2014

YEAR: 2014     DOI: 10.1002/swe.v12.610.1002/2014SW001056

Aurora; forecasting; precipitation

OVATION Prime-2013: Extension of auroral precipitation model to higher disturbance levels

OVATION Prime (OP) is an auroral precipitation model parameterized by solar wind driving. Distinguishing features of the model include an optimized solar wind-magnetosphere coupling function (dΦ_MP/dt) which predicts auroral power significantly better than\ Kpor other traditional parameters, the separation of aurora into categories (diffuse aurora, monoenergetic, broadband, and ion), the inclusion of seasonal variations, and separate parameter fits for each magnetic latitude (MLA ...

Newell, P.; Liou, K.; Zhang, Y.; Sotirelis, T.; Paxton, L.; Mitchell, E.;

Published by: Space Weather      Published on: Jan-06-2014

YEAR: 2014     DOI: 10.1002/swe.v12.610.1002/2014SW001056

Aurora; forecasting; precipitation

The International Reference Ionosphere 2012 \textendash a model of international collaboration

The International Reference Ionosphere (IRI) project was established jointly by the Committee on Space Research (COSPAR) and the International Union of Radio Science (URSI) in the late sixties with the goal to develop an international standard for the specification of plasma parameters in the Earth\textquoterights ionosphere. COSPAR needed such a specification for the evaluation of environmental effects on spacecraft and experiments in space, and URSI for radiowave propagation studies and applications. At the request of C ...

Bilitza, Dieter; Altadill, David; Zhang, Yongliang; Mertens, Chris; Truhlik, Vladimir; Richards, Phil; McKinnell, Lee-Anne; Reinisch, Bodo;

Published by: Journal of Space Weather and Space Climate      Published on: Jan-01-2014

YEAR: 2014     DOI: 10.1051/swsc/2014004

The International Reference Ionosphere 2012 \textendash a model of international collaboration

The International Reference Ionosphere (IRI) project was established jointly by the Committee on Space Research (COSPAR) and the International Union of Radio Science (URSI) in the late sixties with the goal to develop an international standard for the specification of plasma parameters in the Earth\textquoterights ionosphere. COSPAR needed such a specification for the evaluation of environmental effects on spacecraft and experiments in space, and URSI for radiowave propagation studies and applications. At the request of C ...

Bilitza, Dieter; Altadill, David; Zhang, Yongliang; Mertens, Chris; Truhlik, Vladimir; Richards, Phil; McKinnell, Lee-Anne; Reinisch, Bodo;

Published by: Journal of Space Weather and Space Climate      Published on: Jan-01-2014

YEAR: 2014     DOI: 10.1051/swsc/2014004

Global Assimilation of Ionospheric Measurements (GAIM) - Gauss Markov (GM) Model: Improved Specifications with Multiple Data Types

The Earth\textquoterights ionosphere is a highly dynamic region that is almost constantly in a state of flux. Solar radiation, geomagnetic activity, chemical reactions, and natural dynamics all act to perturb the state of the ionosphere. The ionosphere changes on time scales of hours to days, with the fine-scale ionospheric structures that are frequently observed lacking in global physics-based models due to time-step and spatial resolution constraints. To properly specify the ionosphere, data is needed, thus data assimil ...

Gardner, L.; Schunk, R.; Scherliess, L.; Sojka, J.; Zhu, L.;

Published by: Space Weather      Published on: 11/2014

YEAR: 2014     DOI: 10.1002/2014SW001104

Data Assimilation; Ionosphere; modeling

Statistical relationship between large-scale upward field-aligned currents and electron precipitation

Simultaneous observations of Birkeland currents by the constellation of Iridium satellites and N₂\ Lyman-Birge-Hopfield (LBH) auroral emissions measured by the Global Ultraviolet Imager (GUVI) onboard the Thermosphere, Ionosphere, and Mesosphere Energetics and Dynamics (TIMED) satellite are used to establish relationships between large-scale upward field-aligned currents and electron precipitation during stable current configurations. The electron precipitation was inferred from GUVI data using a statistic ...

Korth, Haje; Zhang, Yongliang; Anderson, Brian; Sotirelis, Thomas; Waters, Colin;

Published by: Journal of Geophysical Research: Space Physics      Published on: 08/2014

YEAR: 2014     DOI: 10.1002/2014JA019961

auroral emissions; Birkeland currents; current-precipitation relationship; current-voltage relationship; electron precipitation

Reply to comment on \textquotedblleftEmpirical relationship between electron precipitation and far-ultraviolet auroral emissions from DMSP observations\textquotedblright

Sotirelis, Thomas; Korth, Haje; Hsieh, Syau-Yun; Zhang, Yongliang; Morrison, Daniel; Paxton, Larry;

Published by: Journal of Geophysical Research: Space Physics      Published on: Jan-10-2013

YEAR: 2013     DOI: 10.1002/jgra.v118.1010.1002/jgra.50507

Empirical relationship between electron precipitation and far-ultraviolet auroral emissions from DMSP observations

Sotirelis, Thomas; Korth, Haje; Hsieh, Syau-Yun; Zhang, Yongliang; Morrison, Daniel; Paxton, Larry;

Published by: Journal of Geophysical Research: Space Physics      Published on: Jan-03-2013

YEAR: 2013     DOI: 10.1002/jgra.50157

An interhemispheric comparison of GPS phase scintillation with auroral emission observed at the South Pole and from the DMSP satellite

Prikryl, Paul; Zhang, Yongliang; Ebihara, Yusuke; Ghoddousi-Fard, Reza; Jayachandran, Periyadan; Kinrade, Joe; Mitchell, Cathryn; Weatherwax, Allan; Bust, Gary; Cilliers, Pierre;

Published by: Annals of Geophysics      Published on:

YEAR: 2013     DOI:

Empirical Relationship Between LBH Auroral Emissions and Particle Precipitation

Hsieh, SW; Sotirelis, T; Korth, H; Zhang, Y; Paxton, LJ;

Published by:       Published on:

YEAR: 2011     DOI:

Study on spectrograph for ionosphere: a broadband imaging instrument prototype for far-ultraviolet

Yu, Lei; Wang, Shu-rong; Lin, Guan-yu;

Published by:       Published on:

YEAR: 2011     DOI: 10.1117/12.895219

Near real-time assimilation in IRI of auroral peak E-region density and equatorward boundary

Zhang, Yongliang; Paxton, Larry; Bilitza, Dieter; Doe, Rick;

Published by: Advances in Space Research      Published on: Jan-10-2010

YEAR: 2010     DOI: 10.1016/j.asr.2010.06.029

Ionospheric dynamics and drivers obtained from a physics-based data assimilation model

Scherliess, Ludger; Thompson, Donald; Schunk, Robert;

Published by: Radio Science      Published on: Jan-02-2009

YEAR: 2009     DOI: 10.1029/2008RS004068

Observations of the Ionosphere Using the Tiny Ionospheric Photometer

Coker, Clayton; Dymond, Kenneth; Budzien, Scott; Chua, Damien; Liu, Jann-Yenq; Anderson, David; Basu, Sunanda; Pedersen, Todd;

Published by: Terrestrial, Atmospheric and Oceanic Sciences      Published on: Jan-01-2009

YEAR: 2009     DOI: 10.3319/TAO.2008.01.18.02(F3C)

Current and Future Development of the Operational Global Assimilation of Ionospheric Measurements (GAIM)

Dandenault, P; Coker, C; Thonnard, S; Schunk, B; Thompson, D; Smith, D; Weaver, S; Scherliess, L; Reich, J;

Published by:       Published on:

YEAR: 2008     DOI:

Ionosphere-thermosphere perturbations due to lower atmospheric waves

Schunk, Robert; Gardner, Larry; Scherliess, Ludger; Thompson, Donald; Sojka, Jan;

Published by:       Published on:

YEAR: 2008     DOI:

Wave Coupling Between the Lower and Upper Atmospheres

Schunk, RW; Gardner, LC; Scherliess, L; Thompson, DC; Sojka, JJ; Siskind, DE; Eckermann, SD; Drob, DP; Hoppel, K;

Published by:       Published on:

YEAR: 2008     DOI:

A Thermosphere-Ionosphere Data Assimilation Model Component for a Seamless Ocean-Atmosphere Model

Schunk, Robert; Scherliess, L; Thompson, DC; Sojka, JJ; Zhu, L;

Published by:       Published on:

YEAR: 2007     DOI:

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;

Published by:       Published on:

YEAR: 2006     DOI:

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;

Published by:       Published on:

YEAR: 2006     DOI:

First Observations of the Ionosphere using the Tiny Ionospheric Photometer

Coker, C; Dymond, KF; Budzien, SA; Chua, D; Liu, JY;

Published by:       Published on:

YEAR: 2006     DOI:

An overview of the NEAR multispectral imager-near-infrared spectrometer investigation

Veverka, J.; Bell, J.; Thomas, P.; Harch, A.; Murchie, S.; Hawkins, S.; Warren, J.; Darlington, H.; Peacock, K.; Chapman, C.; McFadden, L.; Malin, M.; Robinson, M.;

Published by: Journal of Geophysical Research      Published on: Jan-01-1997

YEAR: 1997     DOI: 10.1029/97JE01742

An overview of the NEAR multispectral imager-near-infrared spectrometer investigation

Veverka, J.; Bell, J.; Thomas, P.; Harch, A.; Murchie, S.; Hawkins, S.; Warren, J.; Darlington, H.; Peacock, K.; Chapman, C.; McFadden, L.; Malin, M.; Robinson, M.;

Published by: Journal of Geophysical Research      Published on: Jan-01-1997

YEAR: 1997     DOI: 10.1029/97JE01742

The Near Earth Asteroid Rendezvous MissionNear Infrared Spectrometer for the Near Earth Asteroid Rendezvous Mission

Warren, Jeffery; Peacock, Keith; Darlington, Edward; Murchie, Scott; Oden, Stephen; Hayes, John; Bell, James; Krein, Stephen; Mastandrea, Andy;

Published by:       Published on:

YEAR: 1997     DOI: 10.1007/978-94-011-5200-610.1007/978-94-011-5200-6_3

FUV remote sensing of thermospheric composition and the solar EUV flux

Strickland, Douglas; Link, Richard; Paxton, Larry;

Published by:       Published on:

YEAR: 1993     DOI: 10.1117/12.140842

SSUSI - Horizon-to-horizon and limb-viewing spectrographic imager for remote sensing of environmental parameters

Paxton, Larry; Meng, Ching-I.; Fountain, Glen; Ogorzalek, Bernard; Darlington, Edward; Gary, Stephen; Goldsten, John; Kusnierkiewicz, David; Lee, Susan; Linstrom, Lloyd; Maynard, Jeffrey; Peacock, Keith; Persons, David; Smith, Brian; Strickland, Douglas; Daniell, R.;

Published by:       Published on:

YEAR: 1993     DOI: 10.1117/12.140846

SSUSI - Horizon-to-horizon and limb-viewing spectrographic imager for remote sensing of environmental parameters

Paxton, Larry; Meng, Ching-I.; Fountain, Glen; Ogorzalek, Bernard; Darlington, Edward; Gary, Stephen; Goldsten, John; Kusnierkiewicz, David; Lee, Susan; Linstrom, Lloyd; Maynard, Jeffrey; Peacock, Keith; Persons, David; Smith, Brian; Strickland, Douglas; Daniell, R.;

Published by:       Published on:

YEAR: 1993     DOI: 10.1117/12.140846

Special sensor ultraviolet spectrographic imager: an instrument description

Paxton, Larry; Meng, Ching-I; Fountain, Glen; Ogorzalek, Bernard; Darlington, Edward; Gary, Stephen; Goldsten, John; Kusnierkiewicz, David; Lee, Susan; Linstrom, Lloyd; , others;

Published by:       Published on: 06/1992

YEAR: 1992     DOI: 10.1117/12.60595

Special sensor ultraviolet spectrographic imager: an instrument description

Paxton, Larry; Meng, Ching-I; Fountain, Glen; Ogorzalek, Bernard; Darlington, Edward; Gary, Stephen; Goldsten, John; Kusnierkiewicz, David; Lee, Susan; Linstrom, Lloyd; , others;

Published by:       Published on: 06/1992

YEAR: 1992     DOI: 10.1117/12.60595