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

Year 2019, Volume: 23 Issue: 6, 1237 - 1241, 01.12.2019

Erdinç Timoçin

https://doi.org/10.16984/saufenbilder.559334

Cited By: 3

Abstract

In this
reseach, the changes in the low latitude critical frequencies (foF2) was
investigated during the geomagnetically active hours (geomagnetic storms). The critical
frequency (foF2) data obtained for 1991 over Manila that is low latitude
ionosonde station and the planetary geomagnetic indices (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 (increase or decrease) in foF2 values during
geomagnetically active hours occurs at the event time (zero time) and the local
time (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

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