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dc.contributor.author Chartier, Alex T.
dc.contributor.author Smith, Nathan D.
dc.contributor.author Mitchell, Cathryn N.
dc.contributor.author Jackson, David R.
dc.contributor.author Patilongo, Percy J. C.
dc.date.accessioned 2018-07-23T12:59:33Z
dc.date.available 2018-07-23T12:59:33Z
dc.date.issued 2012-10-25
dc.identifier.citation Chartier, A. T., Smith, N. D., Mitchell, C. N., Jackson, D. R., & Patilongo, P. J. C. (2012). The use of ionosondes in GPS ionospheric tomography at low latitudes.==$Journal of Geophysical Research: Space Physics, 117$==(A10), A10326. https://doi.org/10.1029/2012JA018054 es_ES
dc.identifier.govdoc index-oti2018
dc.identifier.uri http://hdl.handle.net/20.500.12816/2019
dc.description.abstract A new technique is presented for the incorporation of ionosonde observations into GPS ionospheric tomography. This approach greatly improves the vertical resolution of the images when using independent incoherent scatter radar observations as ground truth, addressing a traditional weakness of tomographic techniques. Ionosonde observations are used to set vertical basis functions adaptively within the inversion as well as providing electron density information for direct assimilation. The technique also improves slant total electron content (TEC) accuracy in the vicinity of the ionosonde. An experiment was performed in the equatorial region of South America as a 6-day case study due to the availability of incoherent scatter and ionosonde data during this period. Preliminary results were validated with the Jicamarca incoherent scatter radar and independent GPS slant TEC observations. Using the incoherent scatter radar as ground truth for the vertical profile, the new technique reduces mean NmF2 error to 0.07 1011 electrons/m3 compared with 0.27 1011 electrons/m3 in a control run with no ionosonde data, while root-mean square error is now 0.5 1011 electrons/m3 compared with 1.0 1011 electrons/m3 in the control. The new technique also results in 0.1 km mean error in hmF2, compared with 3.9 km in the control, while root-mean square hmF2 error is around 40 km in both cases. Using independent slant TEC observations, the mean error is 0.36 TECU compared with 0.64 TECU in the control run, while root-mean square error is 3.55 TECU down from 4.02 TECU, suggesting the new technique also improves TEC values. es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher American Geophysical Union es_ES
dc.relation.ispartof urn:issn:2169-9380
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.subject Equatorial es_ES
dc.subject GPS es_ES
dc.subject Ionosonde es_ES
dc.subject Ionosphere es_ES
dc.subject TEC es_ES
dc.subject Tomography es_ES
dc.title The use of ionosondes in GPS ionospheric tomography at low latitudes es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.05.01 es_ES
dc.identifier.journal Journal of Geophysical Research: Space Physics es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi https://doi.org/10.1029/2012JA018054 es_ES

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