Articles | Volume 36, issue 1
https://doi.org/10.5194/angeo-36-139-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/angeo-36-139-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
25 Jan 2018
Regular paper |
| 25 Jan 2018
| 25 Jan 2018
Latitude-dependent delay in the responses of the equatorial electrojet and Sq currents to X-class solar flares
Paulo A. B. Nogueira
CORRESPONDING AUTHOR
Federal Institute of Education, Science and Technology of São Paulo,
Jacareí, São Paulo, Brazil
Mangalathayil A. Abdu
Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São
José dos Campos, 12227-010, São Paulo, Brazil
Jonas R. Souza
Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São
José dos Campos, 12227-010, São Paulo, Brazil
Clezio M. Denardini
Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São
José dos Campos, 12227-010, São Paulo, Brazil
Embrace Space Weather Program, Instituto Nacional de Pesquisas Espaciais,
São José dos Campos, 12227-010, São Paulo, Brazil
Paulo F. Barbosa Neto
Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São
José dos Campos, 12227-010, São Paulo, Brazil
Embrace Space Weather Program, Instituto Nacional de Pesquisas Espaciais,
São José dos Campos, 12227-010, São Paulo, Brazil
João P. Serra de Souza da Costa
Federal Institute of Education, Science and Technology of São Paulo,
Jacareí, São Paulo, Brazil
Ana P. M. Silva
Federal Institute of Education, Science and Technology of São Paulo,
Jacareí, São Paulo, Brazil
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In this work the response of the Brazilian equatorial ionosphere is studied during three HILDCAA events that occurred in the year of 2006 using the digisonde data. Geomagnetic indices and interplanetary parameters were used to calculate a cross-correlation coefficient between the Ey and the hmF2. The results showed that the pumping action of particle precipitation into the auroral zone has moderately modified the equatorial hmF2, being more sensitive during PRE time.
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We have analyzed the low-latitude ionospheric responses to solar flares. In particular we show for the first time that 5 to 8 min of time delay is present in the peak effect in the EEJ, with respect that of Sq current outside the magnetic equator, in response to the flare radiation enhancement. We propose that the flare induced enhancement in neutral wind occurring with a time delay could be responsible for a delayed zonal electric field disturbance driving the EEJ.
We have analyzed the low-latitude ionospheric responses to solar flares. In particular we show...
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