The Effect of Geomagnetic Storms on foF2 Values over Low Latitude Ionosonde Station

Authors : Erdinç TİMOÇİN

Pages : 1237-1241

Doi:10.16984/saufenbilder.559334

View : 24 | Download : 11

Publication Date : 2019-12-01

Article Type : Research Paper

Abstract :In this reseach, the changes in the low latitude critical frequencies insert ignore into journalissuearticles values(foF2); was investigated during the geomagnetically active hours insert ignore into journalissuearticles values(geomagnetic storms);. The critical frequency insert ignore into journalissuearticles values(foF2); data obtained for 1991 over Manila that is low latitude ionosonde station and the planetary geomagnetic indices insert ignore into journalissuearticles values(K p ); were used. The superposed epoch analysis was used as a statistical method to investigate the change in the critical frequencies during geomagnetically active hours. The analyzes were conducted separately for the night hours, day hours and all hours of 1991 and they were compared with each other. The results from this research show that the highest change insert ignore into journalissuearticles values(increase or decrease); in foF2 values during geomagnetically active hours occurs at the event time insert ignore into journalissuearticles values(zero time); and the local time insert ignore into journalissuearticles values(day or night); has a significant impact on this change of the foF2 values. The foF2 values increase at local day hours, while the foF2 values decrease at local night hours.
Keywords : Geomagnetic storms, low latitude ionospheric critical frequency, superposed epoch analysis method