Analysis of the winter and semiannual ionospheric anomalies in 1999-2009 based on GPS global International GNSS Service maps

Our work is focused on the analysis of seasonal and semiannual ionospheric anomalies using vertical total electron content (VTEC) measurements obtained by the International GNSS Service (IGS). For this study we use principal component analysis (PCA) and wavelet transform (WT) because both numerical...

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Autores principales: Meza, Amalia Margarita, Natali, María Paula, Fernández, Laura Isabel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Ciencias Astronómicas
ionospheric anomalies
vertical total electron content
International GNSS Service
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83645
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83645
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
ionospheric anomalies
vertical total electron content
International GNSS Service
spellingShingle Ciencias Astronómicas
ionospheric anomalies
vertical total electron content
International GNSS Service
Meza, Amalia Margarita
Natali, María Paula
Fernández, Laura Isabel
Analysis of the winter and semiannual ionospheric anomalies in 1999-2009 based on GPS global International GNSS Service maps
topic_facet Ciencias Astronómicas
ionospheric anomalies
vertical total electron content
International GNSS Service
description Our work is focused on the analysis of seasonal and semiannual ionospheric anomalies using vertical total electron content (VTEC) measurements obtained by the International GNSS Service (IGS). For this study we use principal component analysis (PCA) and wavelet transform (WT) because both numerical tools allow us to isolate principal components of the VTEC variability as much spatially as temporally. The IGS VTEC maps are reorganized, and from each daily global data set, two maps were constructed: one at 12:00 LT and the other at 22:00 LT. From these two series of VTEC maps covering the period 1999-2009 for each local time, we found that the semiannual anomaly is globally recorded at noon, especially at mid and low geomagnetic latitudes, and its amplitude has a close relationship with the solar activity, and at night this anomaly is recorded during high solar activity and the larger values are located in the South American region. The values of VTEC at the March equinox exceed that of the September equinox, especially during high solar activity; the winter anomaly is recorded at noon near the geomagnetic poles region, and the effect is more important during high solar activity. At night this anomaly is present during the ascending and descending phases and minimum of the solar cycle. Thus, the night winter anomaly effect is clearly evidenced from our results.
format Articulo
Articulo
author Meza, Amalia Margarita
Natali, María Paula
Fernández, Laura Isabel
author_facet Meza, Amalia Margarita
Natali, María Paula
Fernández, Laura Isabel
author_sort Meza, Amalia Margarita
title Analysis of the winter and semiannual ionospheric anomalies in 1999-2009 based on GPS global International GNSS Service maps
title_short Analysis of the winter and semiannual ionospheric anomalies in 1999-2009 based on GPS global International GNSS Service maps
title_full Analysis of the winter and semiannual ionospheric anomalies in 1999-2009 based on GPS global International GNSS Service maps
title_fullStr Analysis of the winter and semiannual ionospheric anomalies in 1999-2009 based on GPS global International GNSS Service maps
title_full_unstemmed Analysis of the winter and semiannual ionospheric anomalies in 1999-2009 based on GPS global International GNSS Service maps
title_sort analysis of the winter and semiannual ionospheric anomalies in 1999-2009 based on gps global international gnss service maps
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/83645
work_keys_str_mv AT mezaamaliamargarita analysisofthewinterandsemiannualionosphericanomaliesin19992009basedongpsglobalinternationalgnssservicemaps
AT natalimariapaula analysisofthewinterandsemiannualionosphericanomaliesin19992009basedongpsglobalinternationalgnssservicemaps
AT fernandezlauraisabel analysisofthewinterandsemiannualionosphericanomaliesin19992009basedongpsglobalinternationalgnssservicemaps
bdutipo_str Repositorios
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