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Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
The presentation discusses the statistical analysis of ionospheric response over Madimbo (22.4° S,
30.9° E) and Grahamstown (33.3° S, 26.5°E), South Africa using ionosonde and GPS data during
the time interval 1996 - 2011. A comprehensive analysis on the critical frequency of F2 layer
(foF2) and Total Electron Content (TEC) was performed using the Disturbance storm time (Dst)
index with a storm criteria of Dst <= -50nT to identify the disturbed days. There were 3 categories
of ionospheric disturbances identified in this study namely: single disturbance, double disturbance
and not significant (NS) ionospheric storms. Single disturbance include positive (P) and negative
(N) ionospheric storms separately, while in double disturbance category both negative and positive
ionospheric storms are observed during the same storm period. The statistics reveal the dependence
of ionospheric storms on geomagnetic storms and also the negative ionospheric effects follow the
sunspot cycle. In general few ionospheric storms (0.11%) were observed during solar minimum.
Positive ionospheric storms occurred most frequently (47.54%) during the declining phase of the
solar cycle 23.
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Main supervisor (name and email)<br>and his / her institution
Dr. John Bosco Habarulema, SANSA, Hermanus, South Africa and Rhodes University, Grahamstown, South Africa
Level for award<br> (Hons, MSc, <br> PhD)?