Mid-latitude ionospheric effects of a great geomagnetic storm

The response of the ionosphere over Ilorin to some geomagnetic storms

“…However, there is a clear increase in NmF2 during the main and recovery phases of the storm on 29 May, although, the maximum NmF2 enhancement occurred during the recovery phase on May 30. These findings are consistent with Adeniyi (1986), Lastovicka (1996), Mansilla (2004), Adebesin (2008), Burns et al (2007), Joshua et al (2011Joshua et al ( , 2013a, Adebiyi et al (2012), Alagbe (2012), Olawepo and Adeniyi (2012) etc. It is attributed to the modification in the EXB force during the geomagnetic storms.…”

“…There are many previous and recent studies on the Ionospheric behaviour during geomagnetic storms (e.g. Skinner and Wright, 1955;Woodman, 1970;Low and Roelof, 1973;Turunen and Rao, 1980;Adeniyi, 1986;Abdu et al, 1995;Sastri, 1988;Radicella and Adeniyi, 1999;Mansilla, 2004;Kumar et al, 2005;Dabas et al, 2006;Burns et al, 2007;Adebesin, 2008;Adekoya et al, 2012;Joshua et al, 2013a,b;etc.). These studies have shown that; geomagnetic storms affect the distribution of electron density in the ionosphere.…”

Response of the Antarctic Ionosphere to Some Intense Geomagnetic Storms

“…During storm conditions the electron concentration can either increase or decrease relative to a "normal" level, which are termed as positive or negative storm effects or positive or negative phases of the storm, respectively. To explain the electron density disturbances during storms several physical mechanisms have been suggested as the possible causes: intensified electric fields, thermospheric meridional winds, "composition bulge", among others [6].…”

Variations of the Ionospheric Conductivity with Different Solar and Geomagnetic Conditions

“…Fuller-Rowell et al [4] studied the response of the neutral component and electron number density of the thermosphere and ionosphere during major geomagnetic storms. Sobral et al [5] and Mansilla [6] discussed the low latitude ionospheric response and mid-latitude ionospheric response during a great geomagnetic storm.…”