Particle precipitations during NEIAL events: simultaneous ground based observations at Svalbard
In this paper we present Naturally Enhanced Ion Acoustic Lines (NEIALs) observed with the EISCAT Svalbard Radar (ESR). For the first time, long sequences of NEIALs are recorded, with more than 50 events within an hour, ranging from 6.4 to 140 s in duration. The events took place from ~08:45 to 10:00...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00032310 2023-05-15T16:04:43+02:00 Particle precipitations during NEIAL events: simultaneous ground based observations at Svalbard Lunde, J. Gustavsson, B. Løvhaug, U. P. Lorentzen, D. A. Ogawa, Y. 2007-06 electronic https://doi.org/10.5194/angeo-25-1323-2007 https://noa.gwlb.de/receive/cop_mods_00032310 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032264/angeo-25-1323-2007.pdf https://angeo.copernicus.org/articles/25/1323/2007/angeo-25-1323-2007.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-25-1323-2007 https://noa.gwlb.de/receive/cop_mods_00032310 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032264/angeo-25-1323-2007.pdf https://angeo.copernicus.org/articles/25/1323/2007/angeo-25-1323-2007.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2007 ftnonlinearchiv https://doi.org/10.5194/angeo-25-1323-2007 2022-02-08T22:46:17Z In this paper we present Naturally Enhanced Ion Acoustic Lines (NEIALs) observed with the EISCAT Svalbard Radar (ESR). For the first time, long sequences of NEIALs are recorded, with more than 50 events within an hour, ranging from 6.4 to 140 s in duration. The events took place from ~08:45 to 10:00 UT, 22 January 2004. We combine ESR data with observations of optical aurora by a meridian scanning photometer at wavelengths 557.7, 630.0, 427.8, and 844.6 nm, as well as records from a magnetometer and an imaging riometer. The large numbers of observed NEIALs together with these additional observations, enable us to characterise the particle precipitation during the NEIAL events. We find that the intensities in all optical lines studied must be above a certain level for the NEIALs to appear. We also find that the soft particle precipitation is associated with the down-shifted shoulder in the incoherent scatter spectrum, and that harder precipitation may play a role in the enhancement of the up-shifted shoulder. The minimum energy flux during NEIAL events found in this study was ~3.5 mW/m2 and minimum characteristic energy around 50 eV. Article in Journal/Newspaper EISCAT Svalbard Niedersächsisches Online-Archiv NOA Svalbard Annales Geophysicae 25 6 1323 1336 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Lunde, J. Gustavsson, B. Løvhaug, U. P. Lorentzen, D. A. Ogawa, Y. Particle precipitations during NEIAL events: simultaneous ground based observations at Svalbard |
topic_facet |
article Verlagsveröffentlichung |
description |
In this paper we present Naturally Enhanced Ion Acoustic Lines (NEIALs) observed with the EISCAT Svalbard Radar (ESR). For the first time, long sequences of NEIALs are recorded, with more than 50 events within an hour, ranging from 6.4 to 140 s in duration. The events took place from ~08:45 to 10:00 UT, 22 January 2004. We combine ESR data with observations of optical aurora by a meridian scanning photometer at wavelengths 557.7, 630.0, 427.8, and 844.6 nm, as well as records from a magnetometer and an imaging riometer. The large numbers of observed NEIALs together with these additional observations, enable us to characterise the particle precipitation during the NEIAL events. We find that the intensities in all optical lines studied must be above a certain level for the NEIALs to appear. We also find that the soft particle precipitation is associated with the down-shifted shoulder in the incoherent scatter spectrum, and that harder precipitation may play a role in the enhancement of the up-shifted shoulder. The minimum energy flux during NEIAL events found in this study was ~3.5 mW/m2 and minimum characteristic energy around 50 eV. |
format |
Article in Journal/Newspaper |
author |
Lunde, J. Gustavsson, B. Løvhaug, U. P. Lorentzen, D. A. Ogawa, Y. |
author_facet |
Lunde, J. Gustavsson, B. Løvhaug, U. P. Lorentzen, D. A. Ogawa, Y. |
author_sort |
Lunde, J. |
title |
Particle precipitations during NEIAL events: simultaneous ground based observations at Svalbard |
title_short |
Particle precipitations during NEIAL events: simultaneous ground based observations at Svalbard |
title_full |
Particle precipitations during NEIAL events: simultaneous ground based observations at Svalbard |
title_fullStr |
Particle precipitations during NEIAL events: simultaneous ground based observations at Svalbard |
title_full_unstemmed |
Particle precipitations during NEIAL events: simultaneous ground based observations at Svalbard |
title_sort |
particle precipitations during neial events: simultaneous ground based observations at svalbard |
publisher |
Copernicus Publications |
publishDate |
2007 |
url |
https://doi.org/10.5194/angeo-25-1323-2007 https://noa.gwlb.de/receive/cop_mods_00032310 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032264/angeo-25-1323-2007.pdf https://angeo.copernicus.org/articles/25/1323/2007/angeo-25-1323-2007.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
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-25-1323-2007 https://noa.gwlb.de/receive/cop_mods_00032310 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032264/angeo-25-1323-2007.pdf https://angeo.copernicus.org/articles/25/1323/2007/angeo-25-1323-2007.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-25-1323-2007 |
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Annales Geophysicae |
container_volume |
25 |
container_issue |
6 |
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1323 |
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