Articles | Volume 37, issue 4
Regular paper
30 Jul 2019
Regular paper |  | 30 Jul 2019

Postmidnight equatorial plasma irregularities on the June solstice during low solar activity – a case study

Claudia M. N. Candido, Jiankui Shi, Inez S. Batista, Fabio Becker-Guedes, Emília Correia, Mangalathayil A. Abdu, Jonathan Makela, Nanan Balan, Narayan Chapagain, Chi Wang, and Zhengkuan Liu

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Cited articles

Abalde, J. R., Sahai, Y., Fagundes, P. R., Becker-Guedes, F., Bittencourt, J. A., Pillat, V. G., Lima, W. L. C., Candido, C. M. N., and de Freitas, T. F.: Day-to-day variability in the development of plasma bubbles associated with geomagnetic disturbances, J. Geophys. Res., 114, A04304,, 2009. 
Abdu, M. A., Bittencourt, J. A., and Batista, I. S.: Magnetic declination control of the equatorial F region dynamo field development and spread F, J. Geophys. Res., 86, 11443–11446, 1981a. 
Abdu, M. A., Batista, I. S., and Bittencourt, J. A.: Some characteristics of spread F at the magnetic equatorial station Fortaleza, J. Geophys. Res., 86, 6836–6842, 1981b. 
Abdu, M. A., Sobral, J. H. A., Batista, I. S., Rios, V. H., and Medina, C.: Equatorial spread F occurrence statistics in the American longitudes: Diurnal, seasonal and solar cycle variations, Adv. Space Res., 22, 851–854, 1998. 
Abdu, M. A., Batista, I. S., Reinisch, B. W., de Souza, J. R., Sobral, J. H. A., Pedersen, T. R., Medeiros, A. F., Schuch, N. J., de Paula, E. R., and Groves, K. M., Conjugate Point Equatorial Experiment (COPEX) campaign in Brazil: Electrodynamics highlights on spread F development conditions and day-to-day variability, J. Geophys. Res., 114, A04308,, 2009. 
Short summary
This study concerns postmidnight ionospheric irregularities observed during low solar activity conditions. We analyze data from digisondes and optical imaging systems located in an equatorial region over Brazil. The results show that they occur under unfavorable and unexpected conditions. This work can be useful for space weather forecasting during low solar activity.