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Investigation of Ionospheric Pierce Points for TNPGN-Active Network and
its Magnetic Conjugate Coordinates
Acknowledgments
Supported by TUBITAK EEEAG 110E296 and RFBR 11-02-91370-CT_a, and
TUBITAK EEEAG 109E055.
Introduction
The effect of ionospheric thin shell height, neighboring
stations and satellite positions on Ionospheric Pierce Points
(IPP) are investigated using TNPGN-Active Network in Turkey,
North Cyprus and Turkey’s magnetic conjugate locations.
Figure 1. SLIM Model
References
1. Arıkan, F., Erol, C. B., and Arıkan, O., ``Regularized estimation of vertical
total electron content from Global Positioning System data '', Journal of
Geophysical Research-Space Physics, 108(A12): 1469-1480, 2003.
2. Arıkan, F., Erol, C. B., and Arıkan, O., ``Regularized estimation of VTEC
from GPS data for a desired time period", Radio Science, 39(6), RS6012,
2004.
Method
Along the path between station and satellite, the points
intersect single layer ionosphere model specified as
ionospheric pierce points. Coordinates of pierce points can be
obtained by solving together line equation passing through
station and satellite, and spherical equation.
Figure 2. Satellites Tracks over ‘igir’ and ‘cana’
Figure 3. The arc length between pierce points ‘cana’ and ‘igir’
stations a) 27 satellite, b) 28 satellite
Conclusion
The arc lengths between IPP are approximately around
100 km at TNPGN–Active stations and represent appropriate
sampling intervals. For magnetic conjugate geographic
coordinates, as the distance between pierce points increase,
sampling interval for STEC model increase as well.
Numerical Results
In this study, the ionospheric pierce points are
investigated by using the data obtained from TNPGN – Active
GPS stations between the heights of 200 km to 450 km for 144
stations and 32 satellites at time resolution of 30 seconds. The
effect of height, neighboring and satellite position are
investigated in three cases.
Figure 4. The arc length between pierce points at different height
‘cana’ and ‘igir’ stations a) 27 satellite, b) 28 satellite
Figure 5. The arc length between IPP at magnetic conjugates ‘kerg’,
‘reun’ and ‘rbay’ stations a) 27 satellite, b) 28 satellite
Distance between IPP at Magnetic Conjugates
The ionospheric heights between 200 km and 450 km, the
arc length between IPP are proportional to the distance
between neighborhoods at TNPGN–Active stations and these
are the treshold values for sampling of the ionosphere which
is the spatial and temporal decorrelation of electron density
profile. Magnetic conjugate stations are single stations.
M. S. Sapaz1, F. Arıkan1, T. Gulyaeva2
Department of Electrical and Electronics Engineering1
Hacettepe University, Ankara, TURKEY1
IZMIRAN Institute 142190, Moscow, RUSSIA2
Key Image 3
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Key Image 4
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‘cana’ all
satellites ‘cana’
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‘igir’
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‘igir’
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