Auroral E-region electron density gradients measured
In the theory of E-region plasma instabilities, the ambient electric field and electron density gradient are both included in the same dispersion relation as the key parameters that provide the energy for the generation and growth of electrostatic plasma waves. While there exist numerous measurement...
Published in: | Annales Geophysicae |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer Verlag
2000
|
Subjects: | |
Online Access: | https://doi.org/10.1007/s00585-000-1172-x https://noa.gwlb.de/receive/cop_mods_00036677 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036631/angeo-18-1172-2000.pdf https://angeo.copernicus.org/articles/18/1172/2000/angeo-18-1172-2000.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00036677 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00036677 2023-05-15T16:04:45+02:00 Auroral E-region electron density gradients measured Haldoupis, C. Schlegel, K. Hussey, G. 2000-09 electronic https://doi.org/10.1007/s00585-000-1172-x https://noa.gwlb.de/receive/cop_mods_00036677 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036631/angeo-18-1172-2000.pdf https://angeo.copernicus.org/articles/18/1172/2000/angeo-18-1172-2000.pdf eng eng Springer Verlag Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.1007/s00585-000-1172-x https://noa.gwlb.de/receive/cop_mods_00036677 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036631/angeo-18-1172-2000.pdf https://angeo.copernicus.org/articles/18/1172/2000/angeo-18-1172-2000.pdf https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2000 ftnonlinearchiv https://doi.org/10.1007/s00585-000-1172-x 2022-02-08T22:43:53Z In the theory of E-region plasma instabilities, the ambient electric field and electron density gradient are both included in the same dispersion relation as the key parameters that provide the energy for the generation and growth of electrostatic plasma waves. While there exist numerous measurements of ionospheric electric fields, there are very few measurements and limited knowledge about the ambient electron density gradients, ∇Ne, in the E-region plasma. In this work, we took advantage of the EISCAT CP1 data base and studied statistically the vertical electron density gradient length, Lz=Ne/(dNe/dz), at auroral E-region heights during both eastward and westward electrojet conditions and different ambient electric field levels. Overall, the prevailing electron density gradients, with Lz ranging from 4 to 7 km, are found to be located below 100 km, but to move steadily up in altitude as the electric field level increases. The steepest density gradients, with Lz possibly less than 3 km, occur near 110 km mostly in the eastward electrojet during times of strong electric fields. The results and their implications are examined and discussed in the frame of the linear gradient drift instability theory. Finally, it would be interesting to test the implications of the present results with a vertical radar interferometer. Key words: Ionosphere (auroral ionosphere; ionospheric irregularities; plasma waves and instabilities) Article in Journal/Newspaper EISCAT Niedersächsisches Online-Archiv NOA Annales Geophysicae 18 9 1172 1181 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Haldoupis, C. Schlegel, K. Hussey, G. Auroral E-region electron density gradients measured |
topic_facet |
article Verlagsveröffentlichung |
description |
In the theory of E-region plasma instabilities, the ambient electric field and electron density gradient are both included in the same dispersion relation as the key parameters that provide the energy for the generation and growth of electrostatic plasma waves. While there exist numerous measurements of ionospheric electric fields, there are very few measurements and limited knowledge about the ambient electron density gradients, ∇Ne, in the E-region plasma. In this work, we took advantage of the EISCAT CP1 data base and studied statistically the vertical electron density gradient length, Lz=Ne/(dNe/dz), at auroral E-region heights during both eastward and westward electrojet conditions and different ambient electric field levels. Overall, the prevailing electron density gradients, with Lz ranging from 4 to 7 km, are found to be located below 100 km, but to move steadily up in altitude as the electric field level increases. The steepest density gradients, with Lz possibly less than 3 km, occur near 110 km mostly in the eastward electrojet during times of strong electric fields. The results and their implications are examined and discussed in the frame of the linear gradient drift instability theory. Finally, it would be interesting to test the implications of the present results with a vertical radar interferometer. Key words: Ionosphere (auroral ionosphere; ionospheric irregularities; plasma waves and instabilities) |
format |
Article in Journal/Newspaper |
author |
Haldoupis, C. Schlegel, K. Hussey, G. |
author_facet |
Haldoupis, C. Schlegel, K. Hussey, G. |
author_sort |
Haldoupis, C. |
title |
Auroral E-region electron density gradients measured |
title_short |
Auroral E-region electron density gradients measured |
title_full |
Auroral E-region electron density gradients measured |
title_fullStr |
Auroral E-region electron density gradients measured |
title_full_unstemmed |
Auroral E-region electron density gradients measured |
title_sort |
auroral e-region electron density gradients measured |
publisher |
Springer Verlag |
publishDate |
2000 |
url |
https://doi.org/10.1007/s00585-000-1172-x https://noa.gwlb.de/receive/cop_mods_00036677 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036631/angeo-18-1172-2000.pdf https://angeo.copernicus.org/articles/18/1172/2000/angeo-18-1172-2000.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.1007/s00585-000-1172-x https://noa.gwlb.de/receive/cop_mods_00036677 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036631/angeo-18-1172-2000.pdf https://angeo.copernicus.org/articles/18/1172/2000/angeo-18-1172-2000.pdf |
op_rights |
https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00585-000-1172-x |
container_title |
Annales Geophysicae |
container_volume |
18 |
container_issue |
9 |
container_start_page |
1172 |
op_container_end_page |
1181 |
_version_ |
1766400378229751808 |