Open AccessRetrieval and validation of ionospheric measurements from COSMIC radio occultation
Author(s) -
XU Xian-sheng,
Hong Zhang,
Peng Guo,
Liu Rong-Jian
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.2163
Subject(s) - radio occultation , tec , ionosonde , ionosphere , occultation , cosmic cancer database , total electron content , electron density , physics , standard deviation , altitude (triangle) , geodesy , atmospheric sciences , computational physics , geology , astronomy , electron , mathematics , geometry , statistics , quantum mechanics
The relative total electron content TEC is obtained through the combination of COSMIC radio occultation ionospheric measurements L1 and L2 phase. The TEC data are then calibrated by non-occultation observation data on the auxiliary side to remove portion of TEC above the LEO orbit altitude. The electron density profile can be retrieved from TEC by Abel integral transformationwith a spherically symmetric assumption of electron density and an approximation of signal straight-line propagation. The computation standard deviation of F2-layer critical frequency f0F2 is about 059 MHzand the standard deviation of F2-layer peak altitude hmF2 is about 3308 kmas through comparing 4903 COSMIC ionospheric occultation profiles with those from ionosonde stationsof which the longtitude deviations are less than 10°the latitude deviations are less than 2°.