Auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field
Effect of the equatorward shift of the eastward and westward electrojets during magnetic storms main phase is analyzed based on the meridional chains of magnetic observatories EISCAT and IMAGE and several Russian observatories (geomagnetic longitude ~110 ° , corrected geomagnetic latitudes 74 ° F 51...
Published in: | Annales Geophysicae |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
1999
|
Subjects: | |
Online Access: | https://doi.org/10.1007/s00585-999-0497-3 https://doaj.org/article/2d7854ce1a374c598f4a1bab75b3e5ed |
id |
ftdoajarticles:oai:doaj.org/article:2d7854ce1a374c598f4a1bab75b3e5ed |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:2d7854ce1a374c598f4a1bab75b3e5ed 2023-05-15T16:04:49+02:00 Auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field Y. I. Feldstein L. I. Gromova A. Grafe C.-I. Meng V. V. Kalegaev I. I. Alexeev Y. P. Sumaruk 1999-04-01T00:00:00Z https://doi.org/10.1007/s00585-999-0497-3 https://doaj.org/article/2d7854ce1a374c598f4a1bab75b3e5ed EN eng Copernicus Publications https://www.ann-geophys.net/17/497/1999/angeo-17-497-1999.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-999-0497-3 0992-7689 1432-0576 https://doaj.org/article/2d7854ce1a374c598f4a1bab75b3e5ed Annales Geophysicae, Vol 17, Pp 497-507 (1999) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1999 ftdoajarticles https://doi.org/10.1007/s00585-999-0497-3 2022-12-31T03:01:18Z Effect of the equatorward shift of the eastward and westward electrojets during magnetic storms main phase is analyzed based on the meridional chains of magnetic observatories EISCAT and IMAGE and several Russian observatories (geomagnetic longitude ~110 ° , corrected geomagnetic latitudes 74 ° F 51 ° .) Magnetic storms of various Dst index intensity where the main phase falls on 1000 UT - 2400 UT interval were selected so that one of the observatory chains was located in the afternoon - near midnight sector of MLT. The eastward electrojet center shifts equatorward with Dst intensity increase: when Dst ~ - 50 nT the electrojet center is located at F ~ 62 ° , when Dst ~ -300 nT it is placed at F ~54 ° . The westward electrojet center during magnetic storms main phase for intervals between substorms shifts equatorward with Dst increase: at F ~ 62 ° when Dst ~ -100 nT and at F ~ 55 ° when Dst ~ -300 nT. During substorms within the magnetic storms intervals the westward electrojet widens poleward covering latitudes F ~ 64 ° - 65 ° . DMSP (F08, F10 and F11) satellite observations of auroral energy plasma precipitations at upper atmosphere altitudes were used to determine precipitation region structure and location of boundaries of various plasma domains during magnetic storms on May 10-11, 1992, February 5-7 and February 21-22, 1994. Interrelationships between center location, poleward and equatorward boundaries of electrojets and characteristic plasma regions are discussed. The electrojet center, poleward and equatorward boundaries along the magnetic observatories meridional chain were mapped to the magnetosphere using the geomagnetic field paraboloid model. The location of auroral energy oxygen ion regions in the night and evening magnetosphere is determined. Considerations are presented on the mechanism causing the appearance in the inner magnetosphere during active intervals of magnetic storms of ions with energy of tens KeV. In the framework of the magnetospheric magnetic field paraboloid model the influence of ... Article in Journal/Newspaper EISCAT Directory of Open Access Journals: DOAJ Articles Annales Geophysicae 17 4 497 507 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 Y. I. Feldstein L. I. Gromova A. Grafe C.-I. Meng V. V. Kalegaev I. I. Alexeev Y. P. Sumaruk Auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Effect of the equatorward shift of the eastward and westward electrojets during magnetic storms main phase is analyzed based on the meridional chains of magnetic observatories EISCAT and IMAGE and several Russian observatories (geomagnetic longitude ~110 ° , corrected geomagnetic latitudes 74 ° F 51 ° .) Magnetic storms of various Dst index intensity where the main phase falls on 1000 UT - 2400 UT interval were selected so that one of the observatory chains was located in the afternoon - near midnight sector of MLT. The eastward electrojet center shifts equatorward with Dst intensity increase: when Dst ~ - 50 nT the electrojet center is located at F ~ 62 ° , when Dst ~ -300 nT it is placed at F ~54 ° . The westward electrojet center during magnetic storms main phase for intervals between substorms shifts equatorward with Dst increase: at F ~ 62 ° when Dst ~ -100 nT and at F ~ 55 ° when Dst ~ -300 nT. During substorms within the magnetic storms intervals the westward electrojet widens poleward covering latitudes F ~ 64 ° - 65 ° . DMSP (F08, F10 and F11) satellite observations of auroral energy plasma precipitations at upper atmosphere altitudes were used to determine precipitation region structure and location of boundaries of various plasma domains during magnetic storms on May 10-11, 1992, February 5-7 and February 21-22, 1994. Interrelationships between center location, poleward and equatorward boundaries of electrojets and characteristic plasma regions are discussed. The electrojet center, poleward and equatorward boundaries along the magnetic observatories meridional chain were mapped to the magnetosphere using the geomagnetic field paraboloid model. The location of auroral energy oxygen ion regions in the night and evening magnetosphere is determined. Considerations are presented on the mechanism causing the appearance in the inner magnetosphere during active intervals of magnetic storms of ions with energy of tens KeV. In the framework of the magnetospheric magnetic field paraboloid model the influence of ... |
format |
Article in Journal/Newspaper |
author |
Y. I. Feldstein L. I. Gromova A. Grafe C.-I. Meng V. V. Kalegaev I. I. Alexeev Y. P. Sumaruk |
author_facet |
Y. I. Feldstein L. I. Gromova A. Grafe C.-I. Meng V. V. Kalegaev I. I. Alexeev Y. P. Sumaruk |
author_sort |
Y. I. Feldstein |
title |
Auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field |
title_short |
Auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field |
title_full |
Auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field |
title_fullStr |
Auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field |
title_full_unstemmed |
Auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field |
title_sort |
auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field |
publisher |
Copernicus Publications |
publishDate |
1999 |
url |
https://doi.org/10.1007/s00585-999-0497-3 https://doaj.org/article/2d7854ce1a374c598f4a1bab75b3e5ed |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Annales Geophysicae, Vol 17, Pp 497-507 (1999) |
op_relation |
https://www.ann-geophys.net/17/497/1999/angeo-17-497-1999.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-999-0497-3 0992-7689 1432-0576 https://doaj.org/article/2d7854ce1a374c598f4a1bab75b3e5ed |
op_doi |
https://doi.org/10.1007/s00585-999-0497-3 |
container_title |
Annales Geophysicae |
container_volume |
17 |
container_issue |
4 |
container_start_page |
497 |
op_container_end_page |
507 |
_version_ |
1766400446395580416 |