GPS TEC and ionosonde TEC over Grahamstown, South Africa: First comparisons

被引:28
作者
McKinnell, Lee-Anne [1 ,2 ]
Opperman, Ben [1 ,2 ]
Cilliers, Pierre J. [1 ]
机构
[1] Hermanus Magnet Observ, ZA-7200 Hermanus, South Africa
[2] Rhodes Univ, Dept Phys & Elect, ZA-6140 Grahamstown, South Africa
关键词
ionosphere; GPS; TEC; ionosonde; plasmasphere;
D O I
10.1016/j.asr.2006.10.018
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
The Grahamstown, South Africa (33.3 degrees S, 26.5 degrees E) ionospheric field station operates a UMass Lowell digital pulse ionospheric sounder (Digisonde) and an Ashtech geodetic grade dual frequency GPS receiver. The GPS receiver is owned by Chief Directorate Surveys and Mapping (CDSM) in Cape Town, forms part of the national TrigNet network and was installed in February 2005. The sampling rates of the GPS receiver and Digisonde were set to 1 s and 15 min, respectively. Data from four continuous months, March-June 2005 inclusive, were considered in this initial investigation. Data available from the Grahamstown GPS receiver was limited, and, therefore, only these 4 months have been considered. Total Electron Content (TEC) values were determined from GPS measurements obtained from satellites passing near vertical (within an 80 degrees elevation) to the station. TEC values were obtained from ionograins recorded at times within 5 min of the near vertical GPS measurement. The GPS derived TEC values are referred to as GTEC and the ionogram derived TEC values as ITEC. Comparisons of GTEC and ITEC values are presented in this paper. The differential clock biases of the GPS satellites and receivers are taken into account. The plasmaspheric contribution to the TEC can be inferred from the results, and confirm findings obtained by other groups. This paper describes the groundwork for a procedure that will allow the validation of GPS derived ionospheric information with ionosonde data. This work will be of interest to the International Reference Ionosphere (IRI) community since GPS receivers are becoming recognised as another source for ionospheric information. (C) 2006 COSPAR. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:816 / 820
页数:5
相关论文
共 9 条
[1]   Plasmaspheric electron content derived from GPS TEC and digisonde ionograms [J].
Belehaki, A ;
Jakowski, N ;
Reinisch, BW .
PATH TOWARD IMPROVED IONOSPHERE SPECIFICATION AND FORECAST MODELS, 2004, 33 (06) :833-837
[2]   Ionospheric total electron content and slab thickness determined in Australia [J].
Breed, AM ;
Goodwin, GL ;
Vandenberg, AM ;
Essex, EA ;
Lynn, KJW ;
Silby, JH .
RADIO SCIENCE, 1997, 32 (04) :1635-1643
[3]   Electron density profiles determined from tomographic reconstruction of total electron content obtained from GPS dual frequency data: First results from the South African network of dual frequency GPS receiver stations [J].
Cilliers, PJ ;
Opperman, BDL ;
Mitchell, CN ;
Spencer, PJ .
IRI: QUANTIFYING IONOSPHERIC VARIABILITY, 2004, 34 (09) :2049-2055
[4]  
DESANTIS A, 1991, ANN GEOPHYS-ATM HYDR, V9, P401
[5]   New approaches in global ionospheric determination using ground GPS data [J].
Hernández-Pajares, M ;
Juan, JM ;
Sanz, J .
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, 1999, 61 (16) :1237-1247
[6]   The contribution of the protonosphere to GPS total electron content: Experimental measurements [J].
Lunt, N ;
Kersley, L ;
Bishop, GJ ;
Mazzella, AJ .
RADIO SCIENCE, 1999, 34 (05) :1273-1280
[7]  
OPPERMAN BDL, 1966, ADV SPACE RES
[8]   Deducing topside profiles and total electron content from bottomside ionograms [J].
Reinisch, BW ;
Huang, X .
INTERNATIONAL REFERENCE IONOSPHERE - WORKSHOP 1999, 2001, 27 (01) :23-30
[9]  
Schaer S., 1999, MAPPING PREDICTING E