Validation of Jason-1 Nadir Ionosphere TEC Using GEONET

Ping, Jinsong; Matsumoto, Koji; Heki, Kosuke; Saito, Akinori; Callahan, Philip S.; Potts, Laramie V.; Shum, C. K.

doi:10.1080/01490410490889049

Cited by 21 publications

(17 citation statements)

References 17 publications

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“…The Jason satellite carries similar instrumentation. Jason nadirdirected TEC intercompares closely with that measured by TOPEX (Ping et al, 2004). The TOPEX and Jason observations of vertical TEC over the oceans provide complementary data sets to the land-based GPS TEC data.…”

Section: Jason/topex Tecmentioning

confidence: 54%

Storm enhanced density: magnetic conjugacy effects

Foster

Rideout

2007

Ann. Geophys.

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Abstract. In the early phases of a geomagnetic storm, the low and mid-latitude ionosphere are greatly perturbed. Large SAPS electric fields map earthward from the perturbed ring current overlapping and eroding the outer plasmasphere and mid-latitude ionosphere, drawing out extended plumes of storm enhanced density (SED). We use combined satellite and ground-based observations to investigate the degree of magnetic conjugacy associated with specific features of the stormtime ionospheric perturbation. We find that many ionospheric disturbance features exhibit degrees of magnetic conjugacy and simultaneity which implicate the workings of electric fields. TEC enhancements on innermagnetospheric field lines at the base of the SED plumes exhibit localized and longitude-dependent features which are not strictly magnetic conjugate. The SED plumes streaming away from these source regions closely follow magnetic conjugate paths. SED plumes can be used as a tracer of the location and strength of disturbance electric fields. The SED streams of cold plasma from lower latitudes enter the polar caps near noon, forming conjugate tongues of ionization over the polar regions. SED plumes exhibit close magnetic conjugacy, confirming that SED is a convection electric field dominated effect. Several conclusions are reached:1) The SED plume occurs in magnetically-conjugate regions in both hemispheres.2) The position of the sharp poleward edge of the SED plume is closely conjugate.3) The SAPS electric field is observed in magnetically conjugate regions (SAPS channel).4) The strong TEC enhancement at the base of the SED plume in the north American sector is more extensive than in its magnetic conjugate region.5) The entry of the SED plume into the polar cap near noon, forming the polar tongue of ionization (TOI), is seen in both hemispheres in magnetically-conjugate regions.

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Section: Jason/topex Tecmentioning

confidence: 54%

Storm enhanced density: magnetic conjugacy effects

Foster

Rideout

2007

Ann. Geophys.

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“…It is shown in [35] that the TEC calculated by the IRI model systematically exceeds the TEC obtained from the "Jason-1" data by 0.33 TECU for a standard deviation of about 10 TECU. However, in that paper the TEC were calculated by the IRI model for up to the orbit height of the satellites, and after that the TEC above the satellite orbit at an altitude of up to 2000 km was estimated (unfortunately, the estimation procedure is not given in that paper) and the model values of TEC were corrected by this magnitude.…”

Section: Discussionmentioning

confidence: 85%

“…Moreover, the difference between the I GMT values according to the "Topex"/"Poseidon" and "Jason-1" data is significantly (statistically) varied in time, but a dispersion analysis shows that the time dependence is not so important for improvement of the error model. It is shown in [35] that according to the "Topex"/"Poseidon" and "Jason-1" data, the TEC has a systematic deviation of about 1.4 TECU. However, it is mentioned there that this estimate is statistically insignificant.…”

Section: International Reference Ionosphere (Iri) Modelmentioning

confidence: 97%

Testing of the international reference ionosphere model using the data of dual-frequency satellite altimeters “Topex”/“Poseidon” and “Jason-1”

Yasukevich

Afraimovich

Palamarchuk

et al. 2009

Radiophys Quantum El

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The international reference ionosphere IRI (IRI-2001 and IRI-2007) model was tested on the basis of a large set of statistical data including the complete 23rd solar cycle. The data of total electron content (TEC) above the ocean surface deduced from measurements by dual-frequency satellite altimeters ("Topex"/"Poseidon" and "Jason-1") were used for the experimental test. It was found that the model TEC values are systematically less than those obtained experimentally by about 3 · 10 16 m −2 . It was shown that the rms deviation of the experimental data from the model shows almost linear dependence on the F10.7 index. The relative errors of IRI-2001 and IRI-2007 have significant 11-year and annual variations. The relative error of IRI-2001 against the altimeter data is less than 40% in 69% of the measurements and of IRI-2007, in 67% of the measurements. The diurnal variation amplitude of the absolute error stipulated by the difference of the model variation and the actual ionization increase during the dawn solar terminator passage is about 5 · 10 16 m −2 .

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“…One of the additional products resulting from this mission is the TEC V , which is computed along the satellite track with a 1 Hz sampling rate from the ionospheric range correction and includes the electron density up to the altitude of 1,336 km. The Jason TEC V has been previously shown to have a positive bias (Ping et al 2004 andWilson 2007). Figure 16, which plots the Jason TEC V as a function of latitude, shows a (2007) between the Jason TEC V and TEC V extending out to GPS satellite altitudes.…”

Section: Tec Validationmentioning

confidence: 96%

Total electron content processing from GPS observations to facilitate ionospheric modeling

2008

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With the increasing global distribution of high rate dual-frequency global positioning system (GPS) receivers, the production of a real-time atmospheric constituent definition, total electron content (TEC), has become a beneficial contributor to the modeling applications used in the assessment of GPS position accuracy and the composition of the ionosphere, plasmasphere, and troposphere. Historically, TEC measurements have been obtained through post processing techniques to produce the quality of data necessary for modeling applications with rigorous error estimate requirements. These procedures necessitated the collection of large volumes of data to address the various abnormalities in the computation of TEC associated with the use of greater data quality controls and source selection while real-time modeling environments must rely on autonomous controls and filtration techniques to prevent the production of erroneous model results. In this paper we present methods for processing TEC in real time, which utilize several procedures including the application of an ionospheric model to automatically perform quality control on the TEC output and the computational techniques used to address receiver multipath, faulty receiver observations, cycle-slips, segmented processing, and receiver calibrations. The resulting TEC measurements are provided with rigorous error estimates validated using the vertical TEC from the Jason satellite mission.

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Validation of Jason-1 Nadir Ionosphere TEC Using GEONET

Cited by 21 publications

References 17 publications

Storm enhanced density: magnetic conjugacy effects

Storm enhanced density: magnetic conjugacy effects

Testing of the international reference ionosphere model using the data of dual-frequency satellite altimeters “Topex”/“Poseidon” and “Jason-1”

Total electron content processing from GPS observations to facilitate ionospheric modeling

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