Study of Ionospheric Irregularities Over Indonesia 
  
Effendy 
 
National Institute of Aeronautics and Space (LAPAN) 
Jl. Dr. Djundjunan 133, Bandung 40173 
Indonesia 
 
Email : fendy@idola.net.id 
  
ABSTRACT 
 
LAPAN’s observation facilities at Bandung (6 o  53’ 39.84‘ S ,107o 35’12.08’’ E)
is operating a GPS Ionosphere Scintillation TEC Monitor (GISTM) since 2007. 
This systems is capable to track up to 10 GPS satellites at the L1 frequency of 
1575.42 MHz. The purpose is to record automatically scintillation parameters of 
amplitude and phase at a 50 Hz rate averaged over 60 seconds. These measurements 
are used to study the occurrence of scintillation activities associated with 
irregularities of the ionosphere and solar activity. 
In parallel with the GPS based scintillation measurements also Total Electron 
Content (TEC) measurements were performed using a Tri Band Beacon (TBB) receiver 
installed at Pontianak Station (0.03o S, 109.36o E ). Reported are preliminary 
results of TBB data for studying the ionospheric structure, irregularities and 
related scintillations. 
For the data analysis several days data are being selected for each month. The 
results are being used to investigate the annual and the diurnal variation of 
TEC and other features such as the relationship of spread F with irregularities 
in the Indonesian region. Global observations indicate a well-developed Southern 
equatorial anomaly crest.