Determination of a geomagnetic storm and substorm effects on the ionospheric variability from GPS observations at high latitudes
The aim of this work is to characterize the ionospheric electron content variability during a standard and simple geomagnetic storm, and substorms during it. The analysis is based on tying the geomagnetic disturbances including the signatures of the current wedge formed during the substorm expansion...
Guardado en:
| Autor principal: | |
|---|---|
| Publicado: |
2007
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v69_n8_p955_Gomez http://hdl.handle.net/20.500.12110/paper_13646826_v69_n8_p955_Gomez |
| Aporte de: |
| id |
paper:paper_13646826_v69_n8_p955_Gomez |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_13646826_v69_n8_p955_Gomez2023-06-08T16:11:55Z Determination of a geomagnetic storm and substorm effects on the ionospheric variability from GPS observations at high latitudes Van Zele, Maria Andrea Geomagnetic storm Geomagnetic substorm GPS ionospheric model Ionospheric perturbation Vertical total electron content Computer simulation Electrons Geomagnetism Global positioning system Ionization Geomagnetic storm Vertical total electron content Ionosphere The aim of this work is to characterize the ionospheric electron content variability during a standard and simple geomagnetic storm, and substorms during it. The analysis is based on tying the geomagnetic disturbances including the signatures of the current wedge formed during the substorm expansion phase, with the variability of ionospheric vertical total electron content (VTEC) in local time; for this reason the VTEC is computed for complete geographical longitude coverage at subauroral and auroral latitudes. The study is based on the geomagnetic storm befallen on April 6 and 7, 2000 (near the equinox) and the TEC are computed from global positioning system (GPS). The main results can be divided into three groups: (a) when the geomagnetic storm starts between pre-midnight and dawn, a minimum of VTEC is recorded, lasting all the long day (ionospheric storm negative phase); also the nighttime electron content may decrease below the corresponding for quiet days; but near the 60{ring operator} of geomagnetic latitude the ionization polar tongue can be observed at noon, superimposed to the negative phase; (b) computed by GPS stations placed lower than 50{ring operator}, when the geomagnetic storm starts between dawn and noon the VTEC recorded a positive phase, but if it starts at noon a dusk effect is recorded; those located between 50{ring operator} and 60{ring operator} show a sudden increase and later sudden decrease to nocturnal values, (c) when the geomagnetic storm starts between afternoon and sunset, at stations located lower than 50{ring operator} a dusk effect and an ionospheric negative phase during the next day are recorded, but if the GPS stations are located at higher latitude than 50{ring operator} the VTEC representation shows the nocturnal end of the ionization polar tongue. Expansion phases of substorms are shown as small VTEC variations recorded for a short time: decreases if the substorm happens between dawn and midday; enhancements during the fall of the ionospheric positive phase. From the comparison with the results obtained by other methods, the GPS analysis proves to be an adequate method for studying globally the ionospheric variability at these latitudes. © 2007 Elsevier Ltd. All rights reserved. Fil:Andrea Van Zele, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v69_n8_p955_Gomez http://hdl.handle.net/20.500.12110/paper_13646826_v69_n8_p955_Gomez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Geomagnetic storm Geomagnetic substorm GPS ionospheric model Ionospheric perturbation Vertical total electron content Computer simulation Electrons Geomagnetism Global positioning system Ionization Geomagnetic storm Vertical total electron content Ionosphere |
| spellingShingle |
Geomagnetic storm Geomagnetic substorm GPS ionospheric model Ionospheric perturbation Vertical total electron content Computer simulation Electrons Geomagnetism Global positioning system Ionization Geomagnetic storm Vertical total electron content Ionosphere Van Zele, Maria Andrea Determination of a geomagnetic storm and substorm effects on the ionospheric variability from GPS observations at high latitudes |
| topic_facet |
Geomagnetic storm Geomagnetic substorm GPS ionospheric model Ionospheric perturbation Vertical total electron content Computer simulation Electrons Geomagnetism Global positioning system Ionization Geomagnetic storm Vertical total electron content Ionosphere |
| description |
The aim of this work is to characterize the ionospheric electron content variability during a standard and simple geomagnetic storm, and substorms during it. The analysis is based on tying the geomagnetic disturbances including the signatures of the current wedge formed during the substorm expansion phase, with the variability of ionospheric vertical total electron content (VTEC) in local time; for this reason the VTEC is computed for complete geographical longitude coverage at subauroral and auroral latitudes. The study is based on the geomagnetic storm befallen on April 6 and 7, 2000 (near the equinox) and the TEC are computed from global positioning system (GPS). The main results can be divided into three groups: (a) when the geomagnetic storm starts between pre-midnight and dawn, a minimum of VTEC is recorded, lasting all the long day (ionospheric storm negative phase); also the nighttime electron content may decrease below the corresponding for quiet days; but near the 60{ring operator} of geomagnetic latitude the ionization polar tongue can be observed at noon, superimposed to the negative phase; (b) computed by GPS stations placed lower than 50{ring operator}, when the geomagnetic storm starts between dawn and noon the VTEC recorded a positive phase, but if it starts at noon a dusk effect is recorded; those located between 50{ring operator} and 60{ring operator} show a sudden increase and later sudden decrease to nocturnal values, (c) when the geomagnetic storm starts between afternoon and sunset, at stations located lower than 50{ring operator} a dusk effect and an ionospheric negative phase during the next day are recorded, but if the GPS stations are located at higher latitude than 50{ring operator} the VTEC representation shows the nocturnal end of the ionization polar tongue. Expansion phases of substorms are shown as small VTEC variations recorded for a short time: decreases if the substorm happens between dawn and midday; enhancements during the fall of the ionospheric positive phase. From the comparison with the results obtained by other methods, the GPS analysis proves to be an adequate method for studying globally the ionospheric variability at these latitudes. © 2007 Elsevier Ltd. All rights reserved. |
| author |
Van Zele, Maria Andrea |
| author_facet |
Van Zele, Maria Andrea |
| author_sort |
Van Zele, Maria Andrea |
| title |
Determination of a geomagnetic storm and substorm effects on the ionospheric variability from GPS observations at high latitudes |
| title_short |
Determination of a geomagnetic storm and substorm effects on the ionospheric variability from GPS observations at high latitudes |
| title_full |
Determination of a geomagnetic storm and substorm effects on the ionospheric variability from GPS observations at high latitudes |
| title_fullStr |
Determination of a geomagnetic storm and substorm effects on the ionospheric variability from GPS observations at high latitudes |
| title_full_unstemmed |
Determination of a geomagnetic storm and substorm effects on the ionospheric variability from GPS observations at high latitudes |
| title_sort |
determination of a geomagnetic storm and substorm effects on the ionospheric variability from gps observations at high latitudes |
| publishDate |
2007 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v69_n8_p955_Gomez http://hdl.handle.net/20.500.12110/paper_13646826_v69_n8_p955_Gomez |
| work_keys_str_mv |
AT vanzelemariaandrea determinationofageomagneticstormandsubstormeffectsontheionosphericvariabilityfromgpsobservationsathighlatitudes |
| _version_ |
1768542563770302464 |