STARE velocity at large flow angles: is it related to the ion acoustic speed?
The electron drift and ion-acoustic speed in the E region inferred from EISCAT measurements are compared with concurrent STARE radar velocity data to investigate a recent hypothesis by Bahcivan et al. (2005), that the electrojet irregularity velocity at large flow angles is simply the product of the...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00033355 2023-05-15T16:04:32+02:00 STARE velocity at large flow angles: is it related to the ion acoustic speed? Uspensky, M. V. Koustov, A. V. Nozawa, S. 2006-05 electronic https://doi.org/10.5194/angeo-24-873-2006 https://noa.gwlb.de/receive/cop_mods_00033355 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00033309/angeo-24-873-2006.pdf https://angeo.copernicus.org/articles/24/873/2006/angeo-24-873-2006.pdf eng eng Copernicus Publications 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/10.5194/angeo-24-873-2006 https://noa.gwlb.de/receive/cop_mods_00033355 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00033309/angeo-24-873-2006.pdf https://angeo.copernicus.org/articles/24/873/2006/angeo-24-873-2006.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2006 ftnonlinearchiv https://doi.org/10.5194/angeo-24-873-2006 2022-02-08T22:45:48Z The electron drift and ion-acoustic speed in the E region inferred from EISCAT measurements are compared with concurrent STARE radar velocity data to investigate a recent hypothesis by Bahcivan et al. (2005), that the electrojet irregularity velocity at large flow angles is simply the product of the ion-acoustic speed and the cosine of an angle between the electron flow and the irregularity propagation direction. About 3000 measurements for flow angles of 50°–70° and electron drifts of 400–1500 m/s are considered. It is shown that the correlation coefficient and the slope of the best linear fit line between the predicted STARE velocity (based solely on EISCAT data and the hypothesis of Bahcivan et al. (2005)) and the measured one are both of the order of ~0.4. Velocity predictions are somewhat better if one assumes that the irregularity phase velocity is the line-of-sight component of the E×B drift scaled down by a factor ~0.6 due to off-orthogonality of irregularity propagation (nonzero effective aspect angles of STARE observations). Article in Journal/Newspaper EISCAT Niedersächsisches Online-Archiv NOA Annales Geophysicae 24 3 873 885 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Uspensky, M. V. Koustov, A. V. Nozawa, S. STARE velocity at large flow angles: is it related to the ion acoustic speed? |
topic_facet |
article Verlagsveröffentlichung |
description |
The electron drift and ion-acoustic speed in the E region inferred from EISCAT measurements are compared with concurrent STARE radar velocity data to investigate a recent hypothesis by Bahcivan et al. (2005), that the electrojet irregularity velocity at large flow angles is simply the product of the ion-acoustic speed and the cosine of an angle between the electron flow and the irregularity propagation direction. About 3000 measurements for flow angles of 50°–70° and electron drifts of 400–1500 m/s are considered. It is shown that the correlation coefficient and the slope of the best linear fit line between the predicted STARE velocity (based solely on EISCAT data and the hypothesis of Bahcivan et al. (2005)) and the measured one are both of the order of ~0.4. Velocity predictions are somewhat better if one assumes that the irregularity phase velocity is the line-of-sight component of the E×B drift scaled down by a factor ~0.6 due to off-orthogonality of irregularity propagation (nonzero effective aspect angles of STARE observations). |
format |
Article in Journal/Newspaper |
author |
Uspensky, M. V. Koustov, A. V. Nozawa, S. |
author_facet |
Uspensky, M. V. Koustov, A. V. Nozawa, S. |
author_sort |
Uspensky, M. V. |
title |
STARE velocity at large flow angles: is it related to the ion acoustic speed? |
title_short |
STARE velocity at large flow angles: is it related to the ion acoustic speed? |
title_full |
STARE velocity at large flow angles: is it related to the ion acoustic speed? |
title_fullStr |
STARE velocity at large flow angles: is it related to the ion acoustic speed? |
title_full_unstemmed |
STARE velocity at large flow angles: is it related to the ion acoustic speed? |
title_sort |
stare velocity at large flow angles: is it related to the ion acoustic speed? |
publisher |
Copernicus Publications |
publishDate |
2006 |
url |
https://doi.org/10.5194/angeo-24-873-2006 https://noa.gwlb.de/receive/cop_mods_00033355 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00033309/angeo-24-873-2006.pdf https://angeo.copernicus.org/articles/24/873/2006/angeo-24-873-2006.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/10.5194/angeo-24-873-2006 https://noa.gwlb.de/receive/cop_mods_00033355 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00033309/angeo-24-873-2006.pdf https://angeo.copernicus.org/articles/24/873/2006/angeo-24-873-2006.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-24-873-2006 |
container_title |
Annales Geophysicae |
container_volume |
24 |
container_issue |
3 |
container_start_page |
873 |
op_container_end_page |
885 |
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1766400117088190464 |