Vertical total electron content and geomagnetic perturbations at mid- and sub-auroral southern latitudes during geomagnetic storms
Several new space geodesy techniques allow us to analyze the behavior of the vertical total electron content (VTEC) with high spatial and temporal resolution. This study is based on the VTEC computed from global positioning system (GPS) satellite signals that are recorded from observatories located...
Guardado en:
| Autores principales: | , , , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_13646826_v67_n4_p315_Meza |
| Aporte de: |
| id |
todo:paper_13646826_v67_n4_p315_Meza |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_13646826_v67_n4_p315_Meza2023-10-03T16:11:12Z Vertical total electron content and geomagnetic perturbations at mid- and sub-auroral southern latitudes during geomagnetic storms Meza, A. Van Zele, M.A. Brunini, C. Cabassi, I.R. Geomagnetic storm Geomagnetic substorm GPS ionospheric model Ionospheric perturbation Vertical total electron content Electrons Geomagnetism Geostationary satellites Global positioning system Ionosphere Magnetic fields Magnetosphere Observatories Geomagnetic disturbances Geomagnetic fields Geomagnetic storms Temporal resolution Vertical total electron content (VTEC) Storms geodesy geomagnetic storm GPS ionosphere Several new space geodesy techniques allow us to analyze the behavior of the vertical total electron content (VTEC) with high spatial and temporal resolution. This study is based on the VTEC computed from global positioning system (GPS) satellite signals that are recorded from observatories located at mid- and sub-auroral southern latitudes. The geomagnetic disturbances are analyzed using the Dst and AL geomagnetic indices and geomagnetic field variations which are recorded from an observatory close to one of the GPS stations and from observatories located at equivalent geomagnetic latitudes but in the Northern Hemisphere. The study is focused on two consecutive geomagnetic storms, which happened on October 4 and 5, 2000, characterized by two flips of the interplanetary magnetic field. During this perturbed period, the substorms are evidenced by the AL index and by the field variations recorded by the geomagnetic observatories. We also analyze a substorm effect that occurred during a geomagnetic storm. Variations in f0F2 are currently considered to study the geomagnetic storm effects on the ionosphere. Our results show that at mid- and subauroral southern latitudes the behavior of the VTEC evidences the "dusk" effect (positive ionospheric storm after noon) in a similar way to f0F2 variations. Similar geomagnetic conditions can be inferred from the Dst index for both geomagnetic storms but a quick rise of the VTEC and the dusk effect is only observed on the first stormy day. The positive ionospheric storm is followed by a negative phase that lasts until October 6. The second geomagnetic storm starts when the negative phase of the first ionospheric storm is still deployed and the ionosphere/plasmasphere system conditions do not allow a new positive ionospheric storm. The AL index and the geomagnetic field variations allow us to recognize the expansion phase of the substorm due to the presence of the electromagnetic wedge that couples the magnetosphere and ionosphere at high latitudes. Fluctuations in the VTEC computed from the GPS observatories are in rough agreement with the influence of the upward and downward field-aligned currents of the wedge. © 2004 Elsevier Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_13646826_v67_n4_p315_Meza |
| 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 Electrons Geomagnetism Geostationary satellites Global positioning system Ionosphere Magnetic fields Magnetosphere Observatories Geomagnetic disturbances Geomagnetic fields Geomagnetic storms Temporal resolution Vertical total electron content (VTEC) Storms geodesy geomagnetic storm GPS ionosphere |
| spellingShingle |
Geomagnetic storm Geomagnetic substorm GPS ionospheric model Ionospheric perturbation Vertical total electron content Electrons Geomagnetism Geostationary satellites Global positioning system Ionosphere Magnetic fields Magnetosphere Observatories Geomagnetic disturbances Geomagnetic fields Geomagnetic storms Temporal resolution Vertical total electron content (VTEC) Storms geodesy geomagnetic storm GPS ionosphere Meza, A. Van Zele, M.A. Brunini, C. Cabassi, I.R. Vertical total electron content and geomagnetic perturbations at mid- and sub-auroral southern latitudes during geomagnetic storms |
| topic_facet |
Geomagnetic storm Geomagnetic substorm GPS ionospheric model Ionospheric perturbation Vertical total electron content Electrons Geomagnetism Geostationary satellites Global positioning system Ionosphere Magnetic fields Magnetosphere Observatories Geomagnetic disturbances Geomagnetic fields Geomagnetic storms Temporal resolution Vertical total electron content (VTEC) Storms geodesy geomagnetic storm GPS ionosphere |
| description |
Several new space geodesy techniques allow us to analyze the behavior of the vertical total electron content (VTEC) with high spatial and temporal resolution. This study is based on the VTEC computed from global positioning system (GPS) satellite signals that are recorded from observatories located at mid- and sub-auroral southern latitudes. The geomagnetic disturbances are analyzed using the Dst and AL geomagnetic indices and geomagnetic field variations which are recorded from an observatory close to one of the GPS stations and from observatories located at equivalent geomagnetic latitudes but in the Northern Hemisphere. The study is focused on two consecutive geomagnetic storms, which happened on October 4 and 5, 2000, characterized by two flips of the interplanetary magnetic field. During this perturbed period, the substorms are evidenced by the AL index and by the field variations recorded by the geomagnetic observatories. We also analyze a substorm effect that occurred during a geomagnetic storm. Variations in f0F2 are currently considered to study the geomagnetic storm effects on the ionosphere. Our results show that at mid- and subauroral southern latitudes the behavior of the VTEC evidences the "dusk" effect (positive ionospheric storm after noon) in a similar way to f0F2 variations. Similar geomagnetic conditions can be inferred from the Dst index for both geomagnetic storms but a quick rise of the VTEC and the dusk effect is only observed on the first stormy day. The positive ionospheric storm is followed by a negative phase that lasts until October 6. The second geomagnetic storm starts when the negative phase of the first ionospheric storm is still deployed and the ionosphere/plasmasphere system conditions do not allow a new positive ionospheric storm. The AL index and the geomagnetic field variations allow us to recognize the expansion phase of the substorm due to the presence of the electromagnetic wedge that couples the magnetosphere and ionosphere at high latitudes. Fluctuations in the VTEC computed from the GPS observatories are in rough agreement with the influence of the upward and downward field-aligned currents of the wedge. © 2004 Elsevier Ltd. All rights reserved. |
| format |
JOUR |
| author |
Meza, A. Van Zele, M.A. Brunini, C. Cabassi, I.R. |
| author_facet |
Meza, A. Van Zele, M.A. Brunini, C. Cabassi, I.R. |
| author_sort |
Meza, A. |
| title |
Vertical total electron content and geomagnetic perturbations at mid- and sub-auroral southern latitudes during geomagnetic storms |
| title_short |
Vertical total electron content and geomagnetic perturbations at mid- and sub-auroral southern latitudes during geomagnetic storms |
| title_full |
Vertical total electron content and geomagnetic perturbations at mid- and sub-auroral southern latitudes during geomagnetic storms |
| title_fullStr |
Vertical total electron content and geomagnetic perturbations at mid- and sub-auroral southern latitudes during geomagnetic storms |
| title_full_unstemmed |
Vertical total electron content and geomagnetic perturbations at mid- and sub-auroral southern latitudes during geomagnetic storms |
| title_sort |
vertical total electron content and geomagnetic perturbations at mid- and sub-auroral southern latitudes during geomagnetic storms |
| url |
http://hdl.handle.net/20.500.12110/paper_13646826_v67_n4_p315_Meza |
| work_keys_str_mv |
AT mezaa verticaltotalelectroncontentandgeomagneticperturbationsatmidandsubauroralsouthernlatitudesduringgeomagneticstorms AT vanzelema verticaltotalelectroncontentandgeomagneticperturbationsatmidandsubauroralsouthernlatitudesduringgeomagneticstorms AT bruninic verticaltotalelectroncontentandgeomagneticperturbationsatmidandsubauroralsouthernlatitudesduringgeomagneticstorms AT cabassiir verticaltotalelectroncontentandgeomagneticperturbationsatmidandsubauroralsouthernlatitudesduringgeomagneticstorms |
| _version_ |
1807316731502264320 |