Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctica American and Australian sectors

The ionospheric response at middle and high latitudes in the Antarctica American and Australian sectors to the 26-27 September 2011 moderately intense geomagnetic storm was investigated using instruments including an ionosonde, riometer, and GNSS receivers. The multi-instrument observations permitte...

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Detalles Bibliográficos
Publicado: 2017
Materias:
Ionosphere (Ionospheric disturbances)
electric field
F region
geomagnetic storm
ionization
ionosphere
Northern Hemisphere
Southern Hemisphere
Antarctica
Australia
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09927689_v35_n5_p1113_Correia
http://hdl.handle.net/20.500.12110/paper_09927689_v35_n5_p1113_Correia
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09927689_v35_n5_p1113_Correia
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spelling paper:paper_09927689_v35_n5_p1113_Correia2023-06-08T15:59:18Z Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctica American and Australian sectors Ionosphere (Ionospheric disturbances) electric field F region geomagnetic storm ionization ionosphere Northern Hemisphere Southern Hemisphere Antarctica Australia The ionospheric response at middle and high latitudes in the Antarctica American and Australian sectors to the 26-27 September 2011 moderately intense geomagnetic storm was investigated using instruments including an ionosonde, riometer, and GNSS receivers. The multi-instrument observations permitted us to characterize the ionospheric storm-enhanced density (SED) and tongues of ionization (TOIs) as a function of storm time and location, considering the effect of prompt penetration electric fields (PPEFs). During the main phase of the geomagnetic storm, dayside SEDs were observed at middle latitudes, and in the nightside only density depletions were observed from middle to high latitudes. Both the increase and decrease in ionospheric density at middle latitudes can be attributed to a combination of processes, including the PPEF effect just after the storm onset, dominated by disturbance dynamo processes during the evolution of the main phase. Two SEDs-TOIs were identified in the Southern Hemisphere, but only the first episode had a counterpart in the Northern Hemisphere. This difference can be explained by the interhemispheric asymmetry caused by the high-latitude coupling between solar wind and the magnetosphere, which drives the dawn-to-dusk component of the interplanetary magnetic field. The formation of polar TOI is a function of the SED plume location that might be near the dayside cusp from which it can enter the polar cap, which was the case in the Southern Hemisphere. Strong GNSS scintillations were observed at stations collocated with SED plumes at middle latitudes and cusp on the dayside and at polar cap TOIs on the nightside. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09927689_v35_n5_p1113_Correia http://hdl.handle.net/20.500.12110/paper_09927689_v35_n5_p1113_Correia
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ionosphere (Ionospheric disturbances)
electric field
F region
geomagnetic storm
ionization
ionosphere
Northern Hemisphere
Southern Hemisphere
Antarctica
Australia
spellingShingle Ionosphere (Ionospheric disturbances)
electric field
F region
geomagnetic storm
ionization
ionosphere
Northern Hemisphere
Southern Hemisphere
Antarctica
Australia
Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctica American and Australian sectors
topic_facet Ionosphere (Ionospheric disturbances)
electric field
F region
geomagnetic storm
ionization
ionosphere
Northern Hemisphere
Southern Hemisphere
Antarctica
Australia
description The ionospheric response at middle and high latitudes in the Antarctica American and Australian sectors to the 26-27 September 2011 moderately intense geomagnetic storm was investigated using instruments including an ionosonde, riometer, and GNSS receivers. The multi-instrument observations permitted us to characterize the ionospheric storm-enhanced density (SED) and tongues of ionization (TOIs) as a function of storm time and location, considering the effect of prompt penetration electric fields (PPEFs). During the main phase of the geomagnetic storm, dayside SEDs were observed at middle latitudes, and in the nightside only density depletions were observed from middle to high latitudes. Both the increase and decrease in ionospheric density at middle latitudes can be attributed to a combination of processes, including the PPEF effect just after the storm onset, dominated by disturbance dynamo processes during the evolution of the main phase. Two SEDs-TOIs were identified in the Southern Hemisphere, but only the first episode had a counterpart in the Northern Hemisphere. This difference can be explained by the interhemispheric asymmetry caused by the high-latitude coupling between solar wind and the magnetosphere, which drives the dawn-to-dusk component of the interplanetary magnetic field. The formation of polar TOI is a function of the SED plume location that might be near the dayside cusp from which it can enter the polar cap, which was the case in the Southern Hemisphere. Strong GNSS scintillations were observed at stations collocated with SED plumes at middle latitudes and cusp on the dayside and at polar cap TOIs on the nightside.
title Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctica American and Australian sectors
title_short Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctica American and Australian sectors
title_full Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctica American and Australian sectors
title_fullStr Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctica American and Australian sectors
title_full_unstemmed Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctica American and Australian sectors
title_sort ionospheric f-region response to the 26 september 2011 geomagnetic storm in the antarctica american and australian sectors
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09927689_v35_n5_p1113_Correia
http://hdl.handle.net/20.500.12110/paper_09927689_v35_n5_p1113_Correia
_version_ 1768542326045540352

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