A new ionospheric storm scale based on TEC and foF2 statistics

Nishioka, Michi; Tsugawa, Takuya; Jin, Hidekatsu; Ishii, Mamoru

doi:10.1002/2016sw001536

Cited by 24 publications

(40 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For TEC validation, we also considered normalized percentage changes of TEC (dTEC[%]_norm = [dTEC[%] − ave_dTEC[%]]/std_dTEC[%]), where ave_dTEC[%] is the average of percentage changes of TEC (dTEC[%]) at a given time and at a given location over the quiet 30 days described above, and std_dTEC[%] is the standard deviation of the average percentage change. The normalized percentage change, dTEC[%]_norm, has the advantage to exclude seasonal, local time, and latitudinal dependences of TEC variability by normalizing the percentage variation using its statistical standard deviation and thus should have mainly storm‐induced variation (Nishioka et al, ). Figure shows an example of dTEC[%] (in red) and dTEC[%]_norm (in blue) at Athens on DOY 076 (between 06 UT and 22 UT).…”

Section: Methodsmentioning

confidence: 99%

Validation of Ionospheric Specifications During Geomagnetic Storms: TEC and foF2 During the 2013 March Storm Event

et al. 2018

View full text Add to dashboard Cite

To address challenges of assessing space weather modeling capabilities, the Community Coordinated Modeling Center is leading a newly established International Forum for Space Weather Modeling Capabilities Assessment. This paper presents preliminary results of validation of modeled foF2 (F 2 layer critical frequency) and TEC (total electron content) during the first selected 2013 March storm event (17 March 2013). In this study, we used eight ionospheric models ranging from empirical to physics-based, coupled ionosphere-thermosphere and data assimilation models. The quantities we considered are TEC and foF2 changes and percentage changes compared to quiet time background, and the maximum and minimum percentage changes. In addition, we considered normalized percentage changes of TEC. We compared the modeled quantities with ground-based observations of vertical Global Navigation Satellite System TEC (provided by Massachusetts Institute of Technology Haystack Observatory) and foF2 data (provided by Global Ionospheric Radio Observatory) at the 12 locations selected in middle latitudes of the American and European-African longitude sectors. To quantitatively evaluate the models' performance, we calculated skill scores including correlation coefficient, root-mean square error (RMSE), ratio of the modeled to observed maximum percentage changes (yield), and timing error. Our study indicates that average RMSEs of foF2 range from about 1 MHz to 1.5 MHz. The average RMSEs of TEC are between~5 and~10 TECU (1 TEC Unit = 10 16 el/m 2 ). dfoF2[%] RMSEs are between 15% and 25%, which is smaller than RMSE of dTEC[%] ranging from 30% to 60%. The performance of the models varies with the location and metrics considered.To address the needs and challenge of assessment of our current knowledge about space weather effects on IT system and current state of IT modeling capabilities, the Community Coordinated Modeling Center (CCMC) has been supporting community-wide model validation projects, including Coupling, Energetics and Dynamics of Atmospheric Regions (CEDAR) and Geospace Environment Modeling (GEM)-CEDAR modeling challenges. The CCMC initiated the CEDAR electrodynamics thermosphere ionosphere challenge in 2009 focusing on the evaluation of basic IT system parameters modeled, such as electron and neutral densities, the ionospheric F 2 layer peak electron density (NmF2) and peak height (hmF2), and vertical drift (Shim Key Points: • foF2/TEC and foF2/TEC changes during a storm predicted by eight ionosphere models were compared with GIRO foF2 and GPS TEC measurements • Skill scores (e.g., correlation coefficient, RMSE, yield, and timing error) were calculated • Model performance strongly depends on the quantities considered, the type of metrics used, and the location considered Supporting Information: • Supporting Information S1 Correspondence to: J. S. Shim, jasoon.shim@nasa.gov Citation: Shim, J. S., Tsagouri, I., Goncharenko, L., Rastaetter, L., Kuznetsova, M., Bilitza, D., et al. (2018). Validation of ionospheric specifications du...

show abstract

Section: Methodsmentioning

confidence: 99%

Validation of Ionospheric Specifications During Geomagnetic Storms: TEC and foF2 During the 2013 March Storm Event

et al. 2018

View full text Add to dashboard Cite

show abstract

“…To the best knowledge of the authors, there is no ionospheric index in the available literature that related the drift velocity with the irregularity/p found are related to the TEC or satellites measurements with the plasma irregularity occurrence ( Nishioka et al, 2017). Additionally, this study confirms that this proposed index can b used to warn the users about the irregularity occurrences, since it was shown that under AV there is at least 15 minutes between V to be greater than 60 minu To the best knowledge of the authors, there is no ionospheric index in the available literature that related the drift velocity with the irregularity/p found are related to the TEC or satellites measurements with the plasma irregularity occurrence ( ).…”

Section: Discussionmentioning

confidence: 99%

“…parameter, considering AV 3 , AV 4 observations in ionograms in the summer of 2009 until 2014 over considering all years for AV ble to observe that the mean , we had the mean , the elapsed time between the V zp peak and the irregularity occurrence is greater than 60 minutes with very high probability (around 50%). To the best knowledge of the authors, there is no ionospheric index in the available literature that related the drift velocity with the irregularity/p found are related to the TEC or satellites measurements with the plasma irregularity occurrence ( Nishioka et al, 2017 used to warn the users about the irregularity occurrences, since it was shown that under AV there is at least 15 minutes between V probability of the ∆t vi to be greater than 60 minu into the products offered by the Embrace program, and it impacts in the Space Weather environment…”

mentioning

confidence: 99%

On developing a new ionospheric plasma index for the Brazilian equatorial F region irregularities

Resende¹,

Nardin²,

Picanço³

et al. 2019

Preprint

View full text Add to dashboard Cite

Abstract. F region vertical drifts (Vz) are the result of the interaction between the ionospheric plasma with the zonal electric field and the Earth's magnetic field. Abrupt variations in Vz are strongly associated with the occurrence of plasma irregularities (spread-F) during the nighttime periods. These irregularities are manifestations of the space weather in the ionosphere environment without necessarily require a solar burst. In this context, the Brazilian Space Weather Study and Monitoring Program (Embrace) of the National Institute for Space Research (INPE) has been developing different indexes to analyze these ionospheric irregularities in the Brazilian sector. Therefore, the main purpose of this work was to produce a new ionospheric scale based on the analysis of the ionospheric plasma drift velocity, named AV. It is based in the maximum value of Vz (Vzp), which in turn is calculated through its relationship with the virtual height parameter, h’F, measured by the Digisonde Portable Sounder (DPS-4D) installed in São Luís (2° S, 44° O, dip: −2,3°). This index quantifies the time relation between the Vz peak and the irregularity observed in the ionogramas. Thus, in this study, we analyzed 8 years of data, between 2009 and 2015, divided by season in order to construct a standardized scale. The results show there is a delay of at least 15 minutes between Vzp observation and the irregularity occurrence. Finally, we believe that this proposed index allow evaluating the impacts of ionospheric phenomena in the Space Weather environment recently.

show abstract

“…Additionally, the ionospheric indexes found show a relationship between TEC or satellite measurements and plasma irregularity occurrence (Huang et al, 2015;Nishioka et al, 2017). On the other hand, there is no ionospheric index in the available literature that found a relationship between the drift velocity and irregularity/plasma bubble occurrences.…”

Section: Climatological Study Of the Av Index And Spreadmentioning

confidence: 99%

“…Jakowski et al (2012) suggested a disturbance ionosphere index (DIX), which describes the perturbation degree of the ionosphere using global navigation satellite systems (GNSS) data. Recently, Nishioka et al (2017) reported on plasma irregularity occurrences using an index based on total electron content (TEC) measurements. However, an index which correlates to the V z with irregularity/plasma bubble occurrences was not found in the literature.…”

Section: Introductionmentioning

confidence: 99%

On developing a new ionospheric plasma index for Brazilian equatorial F region irregularities

et al. 2019

View full text Add to dashboard Cite

F region vertical drifts (V z ) are the result of the interaction between ionospheric plasma with the zonal electric field and the Earth's magnetic field. Abrupt variations in V z are strongly associated with the occurrence of plasma irregularities (spread F) during the nighttime periods. These irregularities are manifestations of space weather in the ionosphere's environment without necessarily requiring a solar burst. In this context, the Brazilian Space Weather Study and Monitoring Program (Embrace) of the National Institute for Space Research (INPE) has been developing different indexes to analyze these ionospheric irregularities in the Brazilian sector. Therefore, the main purpose of this work is to produce a new ionospheric scale based on the analysis of the ionospheric plasma drift velocity, named AV. It is based on the maximum value of V z (V zp ), which in turn is calculated through its relationship with the virtual height parameter, h F , measured by the Digisonde Portable Sounder (DPS-4D) installed in São Luís (2 • S, 44 • W; dip: −2.3 • ). This index quantifies the time relationship between the V z peak and the irregularity observed in the ionograms. Thus, in this study, we analyzed 7 years of data, between 2009 and 2015, divided by season in order to construct a standardized scale. The results show there is a delay of at least 15 min between the V zp observation and the irregularity occurrence. Finally, we believe that this proposed index allows for evaluating the impacts of ionospheric phenomena in the space weather environment.

show abstract

A new ionospheric storm scale based on TEC and f_oF₂ statistics

Cited by 24 publications

References 22 publications

Validation of Ionospheric Specifications During Geomagnetic Storms: TEC and foF2 During the 2013 March Storm Event

Validation of Ionospheric Specifications During Geomagnetic Storms: TEC and foF2 During the 2013 March Storm Event

On developing a new ionospheric plasma index for the Brazilian equatorial F region irregularities

On developing a new ionospheric plasma index for Brazilian equatorial F region irregularities

Contact Info

Product

Resources

About