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Discussion papers
https://doi.org/10.5194/angeo-2019-42
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-42
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 01 Apr 2019

Regular paper | 01 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

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

Laysa Cristina Araujo Resende1, Clezio Marcos Denardini1, Giorgio Arlan Silva Picanço1, Juliano Moro2, Diego Barros1, Cosme Alexandre Oliveira Barros Figueiredo1, and Régia Pereira Silva1 Laysa Cristina Araujo Resende et al.
  • 1National Institute for Space Research (INPE) S. J. Campos, SP, Brazil
  • 2National Space Science Center, Chinese Academy of Sciences, CAS, Beijing, China & Southern Regional Space Research Center – CRS/INPE, Santa Maria, RS, Brazil

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.

Laysa Cristina Araujo Resende et al.
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Laysa Cristina Araujo Resende et al.
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Short summary
The Brazilian Space Weather Study and Monitoring Program (Embrace) has been developing different indexes that describe the ionospheric effects for 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. We analyzed 8 years of in order to construct a standardized scale. The results of this new index allow us evaluating the impacts of ionospheric phenomena in the Space Weather environment.
The Brazilian Space Weather Study and Monitoring Program (Embrace) has been developing different...
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