On the IRI 2007 performance as a TEC predictor for the South American sector
In order to check the performance of International Reference Ionosphere 2007 model (IRI 2007) to predict total electron content (TEC) values, we compare IRI 2007 TEC predictions against TEC measurements obtained using GPS satellites signals. The measured TEC values were obtained at nine stations in...
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Published in | Journal of atmospheric and solar-terrestrial physics Vol. 81-82; pp. 50 - 58 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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01.06.2012
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Abstract | In order to check the performance of International Reference Ionosphere 2007 model (IRI 2007) to predict total electron content (TEC) values, we compare IRI 2007 TEC predictions against TEC measurements obtained using GPS satellites signals. The measured TEC values were obtained at nine stations in the South American sector, ranging from 18.4 to −64.7 in geographic latitude. The data correspond to June solstice and September equinox,1999, a high solar activity year. Moreover comparisons with IRI 2001 performance, studied for the same period, have been done.
The results show: (i) Cases with good agreement between modeled and experimental values for minimum ionization hours. (ii) Strong disagreements in some cases for maximum ionization hours. (iii) In general, the predicted values result firstly underestimated and then overestimated as we move from low to high latitude. (iv) For middle and high latitudes, IRI 2007 calculations are better than those obtained from IRI 2001; on the contrary, at low latitudes and for daytime hours, IRI 2001 shows a better accuracy than IRI 2007.
► The capability of IRI 2007 as a TEC predictor for South American latitudes is checked. ► IRI 2007 predictions are compared with TEC observations obtained from GPS data. ► Also comparisons with IRI 2001 for the same period have been made. ► We found cases with good agreement for minimum ionization hours. ► Both models deviation are different depending on the considered latitude. |
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AbstractList | In order to check the performance of International Reference Ionosphere 2007 model (IRI 2007) to predict total electron content (TEC) values, we compare IRI 2007 TEC predictions against TEC measurements obtained using GPS satellites signals. The measured TEC values were obtained at nine stations in the South American sector, ranging from 18.4 to −64.7 in geographic latitude. The data correspond to June solstice and September equinox,1999, a high solar activity year. Moreover comparisons with IRI 2001 performance, studied for the same period, have been done.
The results show: (i) Cases with good agreement between modeled and experimental values for minimum ionization hours. (ii) Strong disagreements in some cases for maximum ionization hours. (iii) In general, the predicted values result firstly underestimated and then overestimated as we move from low to high latitude. (iv) For middle and high latitudes, IRI 2007 calculations are better than those obtained from IRI 2001; on the contrary, at low latitudes and for daytime hours, IRI 2001 shows a better accuracy than IRI 2007.
► The capability of IRI 2007 as a TEC predictor for South American latitudes is checked. ► IRI 2007 predictions are compared with TEC observations obtained from GPS data. ► Also comparisons with IRI 2001 for the same period have been made. ► We found cases with good agreement for minimum ionization hours. ► Both models deviation are different depending on the considered latitude. |
Author | Scidá, L.A. Cabrera, M.A. Buresova, D. Brunini, C. Mosert, M. Ezquer, R.G. |
Author_xml | – sequence: 1 givenname: L.A. surname: Scidá fullname: Scidá, L.A. email: lscida@herrera.unt.edu.ar organization: Laboratorio de Ionósfera, Dpto. de Física, FACET, Universidad Nacional de Tucumán, Av. Independencia 1800, CP4000 Tucumán, Argentina – sequence: 2 givenname: R.G. surname: Ezquer fullname: Ezquer, R.G. email: rezquer@herrera.unt.edu.ar organization: Laboratorio de Ionósfera, Dpto. de Física, FACET, Universidad Nacional de Tucumán, Av. Independencia 1800, CP4000 Tucumán, Argentina – sequence: 3 givenname: M.A. surname: Cabrera fullname: Cabrera, M.A. email: mcabrera@herrera.unt.edu.ar organization: Laboratorio de Ionósfera, Dpto. de Física, FACET, Universidad Nacional de Tucumán, Av. Independencia 1800, CP4000 Tucumán, Argentina – sequence: 4 givenname: M. surname: Mosert fullname: Mosert, M. email: mmosert@icate-conicet.gob.ar organization: Instituto de Ciencias Astronómicas, de la Tierra y el Espacio (ICATE) CONICET-UNSJ, Av. España 1512 (Sur), CC 467, 5400 San Juan, Argentina – sequence: 5 givenname: C. surname: Brunini fullname: Brunini, C. email: claudio@fcaglp.fcaglp.unlp.edu.ar organization: FCAG, Observatorio Astronómico, Universidad Nacional de La Plata, Paseo del Bosque 1900, Argentina – sequence: 6 givenname: D. surname: Buresova fullname: Buresova, D. email: buresd@ufa.cas.cz organization: Institute of Atmospheric Physics, Bocni II 1401, Prague 14131, Czech Republic |
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Cites_doi | 10.1016/0273-1177(90)90301-F 10.1007/BF02520897 10.1016/0021-9169(81)90051-9 10.1016/j.asr.2003.07.008 10.1016/j.asr.2006.02.002 10.1029/1999RS900002 10.1016/0021-9169(77)90072-1 10.1016/j.asr.2008.10.035 10.1016/j.jastp.2008.04.022 10.1016/S0273-1177(02)00061-3 10.1038/157691a0 10.1016/j.asr.2009.04.028 10.1016/j.jastp.2008.03.013 10.1016/j.asr.2004.03.016 10.1016/j.asr.2007.09.041 10.1016/j.asr.2011.05.036 10.1016/j.asr.2004.03.015 10.1016/j.asr.2003.06.013 10.1029/1999RS900016 10.21236/AD0772733 10.1016/j.asr.2008.09.035 10.1016/S0273-1177(00)00138-1 10.1029/2000RS002432 10.1016/j.asr.2005.09.015 10.1016/j.asr.2009.04.036 10.1016/j.asr.2003.07.009 10.1016/j.asr.2007.07.048 |
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Keywords | IRI Topside Electronic density TEC GPS Ionosphere High latitude Mid latitude density Predictor Space remote sensing Satellite observation Total electron content Global Positioning System Reference model Ionization solar activity Low latitude performances Comparative study |
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Snippet | In order to check the performance of International Reference Ionosphere 2007 model (IRI 2007) to predict total electron content (TEC) values, we compare IRI... |
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SubjectTerms | Earth, ocean, space Electronic density Exact sciences and technology External geophysics GPS Ionosphere IRI Physics of the ionosphere Physics of the magnetosphere TEC Topside |
Title | On the IRI 2007 performance as a TEC predictor for the South American sector |
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