Assessment of spatial and temporal TEC variations derived from ionospheric models over the polar regions

2018 ◽  
Vol 93 (4) ◽  
pp. 455-471 ◽  
Author(s):  
Hu Jiang ◽  
Jingbin Liu ◽  
Zemin Wang ◽  
Jiachun An ◽  
Jikun Ou ◽  
...  
Keyword(s):  
Polar Regions ◽  
Ionospheric Models

scholarly journals Comparison of quite time ionospheric total electron content from IRI-2016 model and GPS observations

2019 ◽  
Author(s):  
Mulugeta Melaku ◽  
Gizaw Mengistu Tsidu
Keyword(s):  
Total Electron Content ◽  
Extreme Values ◽  
Probability Of Detection ◽  
Electron Content ◽  
Polar Regions ◽  
Total Electron ◽  
Gps Tec ◽  
Ionospheric Models ◽  
Spatio Temporal ◽  
Set Up

Abstract. Earth's ionosphere is an important medium of radio wave propagation in modern times. However, the effective use of ionosphere depends on the understanding of its spatio-temporal variability. Towards this end, a number of ground and space-based monitoring facilities have been set up over the years. This is also complemented by model-based studies. However, assessment of the performance of the ionospheric models in capturing observations needs to be conducted. In this work, the performance of IRI-2016 model in simulating total electron content (TEC) observed by network of global position System (GPS) is evaluated based on RMSE, bias, correlation and categorical metrics such as Quantile Probability of Detection (QPOD), Quantile False Alarm Ratio (QFAR), Quantile Categorical Miss (QCM), and Quantile Critical Success Index(QCSI). IRI-2016 model simulations are evaluated against GPS-TEC observations during the solar minima 2008 and maxima 2013. Higher correlation, low RMSE and bias between the modeled and measured TEC values are observed during solar minima than solar maxima. The IRI-2016 model TEC agrees with GPS-TEC strongly over higher latitudes than over tropics in general and EIA crest regions in particular as demonstrated by low RMSE and bias. However, the phases of modeled and simulated TEC agree strongly over the rest of the globe with the exception of the polar regions as indicated by high correlation during all solar activities. Moreover, the performance of the model in capturing extreme values over magnetic equator, mid- and high-latitudes is poor. This has been noted from a decrease in QPOD, QCSI and an increase in QCM and QFAR over most of the globe with an increase in the threshold percentile values of TEC to be simulated from 10 % to 90 % during both solar minimum and maximum periods. The performance of IRI-2016 in correctly simulating observed low (as low as 10th percentile) and high (high than 90th percentile) TEC over EIA crest regions is reasonably good given that IRI-2016 is a climatological model despite large RMSE and positive model bias. Therefore, this study reveals the strength of the IRI-2016 model, which was concealed due to large RMSE and positive bias, in correctly simulating the observed TEC distribution during all seasons and solar activities for the first time. However, it is also worth noting that the performance of IRI-2016 model is relatively poor in 2013 compared to that of 2008 at the higher ends of the TEC distribution.

Wave velocity disturbances of neutral particles and ions in the polar regions

2013 ◽  
Vol 19 (4(83)) ◽  
pp. 50-56
Author(s):  
A.V. Bespalova ◽  
◽  
A.K. Fedorenko ◽  
Keyword(s):  
Wave Velocity ◽  
Polar Regions ◽  
Neutral Particles

Ionospheric models

1994 ◽  
Author(s):  
H. Carlson, Jr. ◽  
S. Basu ◽  
R. Schunk ◽  
R. Heelis
Keyword(s):  
Ionospheric Models

Book Reviews

Transfers ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 146-166
Author(s):  
Johannes Görbert ◽  
Russ Pottle ◽  
Jeff Morrison ◽  
Pramod K. Nayar ◽  
Dirk Göttsche ◽  
...  
Keyword(s):  
New York ◽  
Travel Writing ◽  
Travel Narratives ◽  
Jim Crow ◽  
Cultural Work ◽  
Polar Regions ◽  
Alexander Von Humboldt ◽  
Literary Forms ◽  
Review Finding ◽  
University Of Massachusetts

German Literary Anthropology: Across Cultures, Across Genres Stefan Hermes and Sebastian Kaufmann, eds., Der ganze Mensch – die ganze Menschheit: Völkerkundliche Anthropologie, Literatur und Ästhetik um 1800 (Berlin: de Gruyter, 2014), 318 pp., 10 illustrations, €89.95What’s Old Is New Again, Mostly Julia Kuehn and Paul Smethurst, eds., New Directions in Travel Writing Studies (New York: Palgrave Macmillan, 2015), 325 pp., $90Complex Journeys around the World and through Literary and Intellectual Traditions around 1800 Johannes Görbert, Die Vertextung der Welt: Forschungsreisen als Literatur bei Georg Forster, Alexander von Humboldt und Adelbert von Chamisso. Weltliteraturen/World Literatures, Schriftenreihe der Friedrich Schlegel Graduiertenschule für literaturwissenschaftliche Studien, vol. 7 (Berlin: de Gruyter, 2014), vi, 426 pp., 8 illustrations, €109.95Travel as Cultural Work Gary Totten, African American Travel Narratives from Abroad: Mobility and Cultural Work in the Age of Jim Crow (Amherst: University of Massachusetts Press, 2015), 170 pp., $26.95Colonial Encounters between Africa and Europe—with Special Reference to Austria and Switzerland Manuel Menrath, ed., Afrika im Blick: Afrikabilder im deutschsprachigen Europa, 1870–1970 (Zurich: Chronos, 2012), 329 pp., €43Social Formations and Literary Forms in Long Nineteenth-Century Travel Writing Mary Henes and Brian H. Murray, eds., Travel Writing, Visual Culture and Form, 1760–1900 (London: Palgrave Macmillan, 2016), 248 pp., 21 illustrations, $95Travel Accounts of Polar Regions and Colonial Discourse Mike Frömel, Off ene Räume und gefährliche Reisen im Eis: Reisebeschreibungen über die Polarregionen und ein kolonialer Diskurs im 18. und frühen 19. Jahrhundert (Hannover: Wehrhahn, 2013), 288 pp., €29.50.“Imagined Geographies” and the Navigation of British European Identity Katarina Gephardt, Th e Idea of Europe in British Travel Narratives, 1789–1914 (Burlington, VT: Ashgate, 2014), 248 pp., 15 illustrations, $104.95Terminal and Threshold: Experiencing the Airport Christopher Schaberg, Th e End of Airports (London: Bloomsbury Academic, 2015), 216 pp., 25 illustrations, £13.99NOVEL REVIEW Finding Purity Jonathan Franzen, Purity (New York: Farrar, Straus and Giroux, 2015), 563 pp., $28

Validation of Ionospheric Models

1998 ◽  
Author(s):  
Dwight T. Decker ◽  
Patricia H. Doherty ◽  
Neil J. Grossbard
Keyword(s):  
Ionospheric Models

On the Former Climate of the Polar Regions

1876 ◽  
Vol 10 (6) ◽  
pp. 352-360
Author(s):  
A. E. Nordenskiold
Keyword(s):  
Polar Regions
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