scholarly journals IRI the International Standard for the Ionosphere

2018 ◽  
Vol 16 ◽  
pp. 1-11 ◽  
Author(s):  
Dieter Bilitza
Keyword(s):  
Data Assimilation ◽  
Real Time ◽  
Scientific Literature ◽  
Data Sources ◽  
International Union ◽  
Radio Science ◽  
European Cooperation ◽  
To Come ◽  
Using Data ◽  
Standardization Organization

Abstract. This paper gives a brief overview over the International Reference Ionosphere (IRI) project and model. IRI is recognized as the official standard for the ionosphere by the International Standardization Organization (ISO), the International Union of Radio Science (URSI), the Committee on Space Research (COSPAR), and the European Cooperation for Space Standardization (ECCS). Of great importance are the external drivers of the model that help IRI to represent ionospheric conditions as realistically as possible. The paper discusses the drivers currently used presents recent improvements and changes. Besides the standard solar, magnetic, and ionospheric indices the paper also reports on the adjustment of the model with data and equivalent indices and on the progress towards a Real-Time IRI using data assimilation. IRI has been widely validated with many different data sources and has fared very well in community wide assessment studies. We present some of these studies and document the wide usages of the model in the scientific literature. Finally, we present an outlook on things to come in IRI-2018 and thereafter.

scholarly journals Nonlinear forecasts of ƒ<i>o</i>F2: variation of model predictive accuracy over time

2002 ◽  
Vol 20 (7) ◽  
pp. 1031-1038 ◽  
Author(s):  
A. H. Y. Chan ◽  
P. S. Cannon
Keyword(s):  
Real Time ◽  
Space Weather ◽  
Predictive Accuracy ◽  
Radio Waves ◽  
New Techniques ◽  
Radio Science ◽  
F Region ◽  
Instruments And Techniques ◽  
Using Data ◽  
Hf Communications

Abstract. Space weather effects can strongly influence high-frequency (HF) communications by changing the ionospheric environment through which the radio waves propagate. Since many systems utilize HF communications, the ability to make real-time assessments of propagation conditions is an important part of space weather monitoring systems. In this paper, we present new techniques for measuring high-latitude HF communications link parameters using data from SuperDARN radars. These techniques use ground-scatter returns to define the variation in skip distance with frequency. From these data, the maximum usable frequency (MUF) as a function of range is determined and ionospheric critical frequencies are estimated. These calculations are made in near-real-time and the results are made available on the World Wide Web. F-region critical frequencies calculated using this method show good agreement with ionosonde data.Key words. Ionosphere (active experiments; instruments and techniques) – Radio science (ionospheric propagation)

scholarly journals Synthesis of Ocean Observations Using Data Assimilation for Operational, Real-Time and Reanalysis Systems: A More Complete Picture of the State of the Ocean

2019 ◽  
Vol 6 ◽  
Author(s):  
Andrew M. Moore ◽  
Matthew J. Martin ◽  
Santha Akella ◽  
Hernan G. Arango ◽  
Magdalena Balmaseda ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Real Time ◽  
The State ◽  
Complete Picture ◽  
Using Data ◽  
Ocean Observations

scholarly journals Determining characteristics of HF communications links using SuperDARN

2002 ◽  
Vol 20 (7) ◽  
pp. 1023-1030 ◽  
Author(s):  
J. M. Hughes ◽  
W. A. Bristow ◽  
R. A. Greenwald ◽  
R. J. Barnes
Keyword(s):  
Real Time ◽  
Space Weather ◽  
Radio Waves ◽  
New Techniques ◽  
Radio Science ◽  
F Region ◽  
Instruments And Techniques ◽  
Using Data ◽  
Hf Communications ◽  
Good Agreement

Abstract. Space weather effects can strongly influence high-frequency (HF) communications by changing the ionospheric environment through which the radio waves propagate. Since many systems utilize HF communications, the ability to make real-time assessments of propagation conditions is an important part of space weather monitoring systems. In this paper, we present new techniques for measuring high-latitude HF communications link parameters using data from SuperDARN radars. These techniques use ground-scatter returns to define the variation in skip distance with frequency. From these data, the maximum usable frequency (MUF) as a function of range is determined and ionospheric critical frequencies are estimated. These calculations are made in near-real-time and the results are made available on the World Wide Web. F-region critical frequencies calculated using this method show good agreement with ionosonde data.Key words. Ionosphere (active experiments; instruments and techniques) – Radio science (ionospheric propagation)

A web based tool for operational real-time flood forecasting using data assimilation to update hydraulic states

2016 ◽  
Vol 84 ◽  
pp. 35-49 ◽  
Author(s):  
Mathieu Mure-Ravaud ◽  
Guillaume Binet ◽  
Michael Bracq ◽  
Jean-Jacques Perarnaud ◽  
Antonin Fradin ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Real Time ◽  
Flood Forecasting ◽  
Web Based ◽  
Using Data

Real-time tracking of neuronal network structure using data assimilation

2013 ◽  
Vol 88 (5) ◽  
Author(s):  
Franz Hamilton ◽  
Tyrus Berry ◽  
Nathalia Peixoto ◽  
Timothy Sauer
Keyword(s):  
Data Assimilation ◽  
Real Time ◽  
Neuronal Network ◽  
Network Structure ◽  
Real Time Tracking ◽  
Using Data

Human Mobility Estimation Following Massive Disaster Using Filtering Approach

2016 ◽  
Vol 11 (2) ◽  
pp. 217-224 ◽  
Author(s):  
Akihito Sudo ◽  
◽  
Takehiro Kashiyama ◽  
Takahiro Yabe ◽  
Hiroshi Kanasugi ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Real Time ◽  
Mobile Phones ◽  
Large Scale ◽  
Population Distribution ◽  
Human Mobility ◽  
Time Estimation ◽  
Observation Data ◽  
Real Time Estimation ◽  
Using Data

Real-time estimation of people distribution immediately after a disaster is directly related to disaster reduction and is also highly beneficial in society. Recently, traffic estimation research has been actively performed using data assimilation techniques for observation data obtained from mobile phones. However, there has been no research on data assimilation technique using real-time gridded aggregated observation data obtained from mobile phones, which are available and can be used to estimate population flow and distribution in a metropolitan area during a large-scale disaster. In this research, population distribution in an urban area during a disaster was estimated using gridded aggregated observation data obtained from mobile phones, using particle filter. The experimental results indicated that the particle filters enabled high-precision real-time estimation in the Kanto district.

scholarly journals Estimation of Lateral Inflows Using Data Assimilation in the Context of Real-Time Flood Forecasting for the Marne Catchment in France

2013 ◽  
pp. 93-105
Author(s):  
Johan Habert ◽  
Sophie Ricci ◽  
Andrea Piacentini ◽  
Gabriel Jonville ◽  
Etienne Le Pape ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Real Time ◽  
Flood Forecasting ◽  
Using Data

scholarly journals A real-time groundwater management model using data assimilation

2011 ◽  
Vol 47 (6) ◽  
Author(s):  
Wei-Chen Cheng ◽  
Mario Putti ◽  
Donald R. Kendall ◽  
William W.-G. Yeh
Keyword(s):  
Data Assimilation ◽  
Groundwater Management ◽  
Real Time ◽  
Management Model ◽  
Using Data ◽  
Groundwater Management Model
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