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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-105
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-105
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 07 Aug 2019

Submitted as: regular paper | 07 Aug 2019

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Annales Geophysicae (ANGEO).

Ionospheric Total Electron Content responses to HILDCAAs intervals

Regia Pereira Silva1,2, Clezio Marcos Denardini1, Manilo Soares Marques3, Laysa Cristina Araújo Resende1,4, Juliano Moro4,5, Giorgio Arlan da Silva Picanço1, Gilvan Luiz Borba3, and Marcos Aurélio Ferreira dos Santos2 Regia Pereira Silva et al.
  • 1National Institutefor Space Research – INPE, São José dos Campos-SP, Brazil
  • 2Northeast Regional Center – CRN/INPE, Natal-RN, Brazil
  • 3Geophysics Department (DGEF), Federal University of Rio Grande do Norte (UFRN), Natal-RN, Brazil
  • 4National Space Science Center, China Academy of Science, CAS, Beijing, China
  • 5Southern Regional Space Research Center – CRS/COCRE/INPE, Santa Maria-RS, Brazil

Abstract. The High-Intensity Long-Duration and Continuous AE Activities (HILDCAA) intervals are capable of causing a global disturbance in the terrestrial ionosphere. However, the ionospheric storms' behavior due to these geomagnetic activity forms is still not widely understood. In this study, we seek to comprise the HILDCAAs disturbance time effects in the Total Electron Content (TEC) values with respect to the quiet days' pattern analyzing local time and seasonal dependences, and the influences of the solar wind velocity to a sample of ten intervals occurred in 2015 and 2016 years. The main results showed that the hourly distribution of the disturbance TEC may vary substantially between one interval and another. Doing a comparative to geomagnetic storms, while the positive ionospheric storms are more pronounced in the winter, this season presents less geoeffectiveness or almost none to HILDCAA intervals. It was find an equinoctial anomaly, since the equinoxes represent more ionospheric TEC responses during HILDCAA intervals than the solstices. Regarding to the solar wind velocities, although HILDCAA intervals are associated to High Speed Streams, this association does not present a direct relation regards to TEC disturbances in low and equatorial latitudes.

Regia Pereira Silva et al.
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Short summary
In this work, we studied the HILDCAAs disturbance time effects in the TEC analyzing local time and seasonal dependences, and the influences of the solar wind velocity to a sample of ten intervals occurred in 2015 and 2016. The main results show great variability on the hourly distribution of the dTEC between one interval and another, seasonal behavior different from that presented by geomagnetic storms and the interesting no relation between the dTEC disturbances and the magnitude of the HSS.
In this work, we studied the HILDCAAs disturbance time effects in the TEC analyzing local time...
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