ANALISIS MORFOLOGI GANGGUAN SINTILASI IONOSFER DI INDONESIA
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2016-05-19
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Abstract
This paper continues some results from equatorial GPS ionospheric scintillation
observations that have been conducted at Kototabang, West Sumatera Indonesia.
The previous research has shown that the maximum ionospheric scintillation
occured in equinox months which are in March to April and September to
October. To get the morphological appearances of ionospheric scintillation, the
analysis that is done by determining the percentage of occurances, time of
occurances, and FFT analysis that shows the period of occurance of ionospheric
scintillation. The used data range is 2006 to 2013 data. The amplitude of
scintillation was measured using the S4 index. Ionospheric scintillation was
generated from GPS satellite through ionospheric layers that underwent delaying.
The occurance of ionospheric scintillation was minimum in 2006, 2007, 2008 and
2009 with its value respectively of around 60%, 20%, 35% and 23%. These
occurances were due to a minimum phase of solar activity. In 2011, 2012 and
2013 the scintillation was beginning to increase with its value respectively of
around 99%, 98%, and 99% in which the occurance was selected for S4 ≥ 0,5.
The peak period of the occurance of ionospheric scintillation was obtained from
data processing using Matlab software R2008a® using Fast Fourier Transform
(FFT) method. Ionospheric scintillation generated from the GPS satellite signal
through the ionosphere was delayed. The affects of ionospheric scintillation are
cycle slips, loss of lock in navigational system, fading on signal or message error
in satellite communication.
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Keywords
Ionospheric irregularities, scintillation, F10.7, FFT, GPS satellite