SSUSI Publications


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Found 6 entries in the Bibliography.

Showing entries from 1 through 6


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;

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;

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.;

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

Ionosphere; ionospheric disturbance; ionospheric irregularities; polar ionosphere


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.;

YEAR: 2014     DOI: 10.1002/2014SW001104

Data Assimilation; Ionosphere; modeling

Progress toward forecasting of space weather effects on UHF SATCOM after Operation Anaconda

Space weather impacts on communications are often presented as a\ raison d\textquoterightetre\ for studying space weather (e.g., Solar and Space Physics: A Science for a Technological Society, 2013). Here we consider a communications outage during Operation Anaconda in Afghanistan that may have been related to ionospheric disturbances. Early military operations occurred during the peak of solar cycle 23 when ionospheric variability was enhanced. During Operation Anaconda, the Battle of Takur Gh ...

Kelly, Michael; Comberiate, Joseph; Miller, Ethan; Paxton, Larry;

YEAR: 2014     DOI: 10.1002/2014SW001081

Ionosphere; scintillation; UHF SATCOM

A Method to Calculate the Ionospheric LBH Dayglow Emissions for Large Field of View

LBH dayglow emissions in the ionosphere, produced by the photoelectrons impact on the nitrogen molecules, are the most prominent molecular signals in the far ultraviolet range. Imaging the LBH dayglow emissions from the space can be a powerful method to monitor the state of the upper atmosphere. According to direct excitation theory and spherical geometry, the spectral characteristics of the LBH emission are analyzed and a revised method (RAURIC) to calculate the column emission rate of the LBH dayglow emissions for large ...

Yong-Chao, ZHANG; Fei, HE; Xiao-Xin, ZHANG; Bo, CHEN;

YEAR: 2014     DOI: 10.1002/cjg2.2014.57.issue-210.1002/cjg2.20099

Column Emission Rates; FUV emission; Ionosphere; LBH Bands