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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ftunivtroemsoe:oai:munin.uit.no:10037/3126 2024-06-02T08:05:58+00:00 Particle precipitations during NEIAL events : simultaneous ground based observations at Svalbard Lorentzen, Dag Arne Lunde, June Gustavsson, B Ogawa, Y Løvhaug, U.P. Ogawa, Yasunobu 2007 https://hdl.handle.net/10037/3126 eng eng Copernicus Annales Geophysicae 25(2007) nr. 6 s. 1323-1336 FRIDAID 352890 0992-7689 https://hdl.handle.net/10037/3126 URN:NBN:no-uit_munin_2857 openAccess VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 Journal article Tidsskriftartikkel Peer reviewed 2007 ftunivtroemsoe 2024-05-07T08:42:34Z 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 University of Tromsø: Munin Open Research Archive Svalbard |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
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ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 |
spellingShingle |
VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 Lorentzen, Dag Arne Lunde, June Gustavsson, B Ogawa, Y Løvhaug, U.P. Ogawa, Yasunobu Particle precipitations during NEIAL events : simultaneous ground based observations at Svalbard |
topic_facet |
VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 |
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 |
Lorentzen, Dag Arne Lunde, June Gustavsson, B Ogawa, Y Løvhaug, U.P. Ogawa, Yasunobu |
author_facet |
Lorentzen, Dag Arne Lunde, June Gustavsson, B Ogawa, Y Løvhaug, U.P. Ogawa, Yasunobu |
author_sort |
Lorentzen, Dag Arne |
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 |
publishDate |
2007 |
url |
https://hdl.handle.net/10037/3126 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
Annales Geophysicae 25(2007) nr. 6 s. 1323-1336 FRIDAID 352890 0992-7689 https://hdl.handle.net/10037/3126 URN:NBN:no-uit_munin_2857 |
op_rights |
openAccess |
_version_ |
1800750855100563456 |