Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 40, issue 3
Articles | Volume 40, issue 3
https://doi.org/10.5194/angeo-40-259-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/angeo-40-259-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 40, issue 3
Regular paper
 | 
03 May 2022
Regular paper |  | 03 May 2022

Responses of intermediate layers to geomagnetic activity during the 2009 deep solar minimum over the Brazilian low-latitude sector

Ângela M. Santos, Christiano G. M. Brum, Inez S. Batista, José H. A. Sobral, Mangalathayil A. Abdu, and Jonas R. Souza

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Cited articles

Abdu, M. A., Jayachandran, P. T., MacDougall, J., Cecile, J. F., and Sobral, J. H. A.: Equatorial F zonal plasma irregularity drifts under magnetospheric disturbances, Geophys. Res. Lett., 25, 4137–4140, https://doi.org/10.1029/1998GL900117, 1998. 
Aponte, N., Brum, C. G. M., Sulzer, M. P., and Gonzalez, S. A.: Measurements of the O+ to H+ transition height and ion temperatures in the lower topside ionosphere over Arecibo for equinox conditions during the 2008–2009 extreme solar minimum, J. Geophys. Res.-Space, 118, 4465–4470, https://doi.org/10.1002/jgra.50416, 2013. 
Balan, N., Chen, C. Y., Liu, J. Y., and Bailey, G. J.: Behaviour of the low latitude ionosphere-thermosphere system at long deep solar minimum, Ind. J. Radio Space Phys., 41, 89–97, 2012. 
Brum, C. G. M.: The impacts of particle precipitation spectrum on the 30 MHz cosmic noise absorption over the under the South Atlantic Anomaly Region, 2021 34th General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), Rome, Italy, 28 August–4 September 2021, 1–4, https://doi.org/10.23919/URSIGASS51995.2021.9560414, 2021. 
Brum, C. G. M., Abdu, M. A., Batista, I. S., Carrasco, A. J., and Santos, P. M. T.: Numerical Simulation of Nighttime Electron Precipitation in the Lower Ionosphere over a Sub-Auroral Region, Adv. Space Res., 37, 1051–1057, https://doi.org/10.1016/j.asr.2006.02.003, 2006. 
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Using the Digisonde data this paper shows that the small variation in the geomagnetic activity during low solar activity can affect both the parameter of height and the frequency of the intermediate layer (ILs) over the low-latitude Brazilian sector. The most expressive responses of the ILs to geomagnetic activity were observed during the summer when the height of the ILs suffered a significant decrease with the increase of the magnetic activity magnetic in the first hours of the day.
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