On the relation between type-II ion outflow and naturally enhanced ion acoustic lines in the polar ionosphere
In this work we investigated the relation between type-II ion outflows and NEIALs. Currently, several ion outflows acceleration mechanisms and NEIALs generation theories have been proposed. In the first part of this thesis we review the most important works regarding these two processes. In the seco...
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UiT Norges arktiske universitet
2013
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ftunivtroemsoe:oai:munin.uit.no:10037/6315 2023-05-15T16:04:46+02:00 On the relation between type-II ion outflow and naturally enhanced ion acoustic lines in the polar ionosphere Di Loreto, Massimo 2013-11-15 https://hdl.handle.net/10037/6315 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/6315 URN:NBN:no-uit_munin_5953 openAccess Copyright 2013 The Author(s) VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 FYS-3900 Master thesis Mastergradsoppgave 2013 ftunivtroemsoe 2021-06-25T17:53:54Z In this work we investigated the relation between type-II ion outflows and NEIALs. Currently, several ion outflows acceleration mechanisms and NEIALs generation theories have been proposed. In the first part of this thesis we review the most important works regarding these two processes. In the second part we present the results of our analysis, together with some unexpected events which were not previously described in the literature. We searched for ion outflow and NEIAL events in the data taken from the 42 m fixed antenna of the EISCAT Svalbard radar. We investigated field aligned ion velocities, electron densities, ion and electron temperatures, temperature ratios and ion fluxes in order to: (1) discuss the starting altitude of both NEIALs and outflows; (2) obtain information about the NEIALs’ generation theories, if they are compatible with our observations and at which altitude range they can be valid. We found some recurring situations for the NEIAL occurrence: particle precipitation and ion outflows are usually involved for events above 300 km, while the few NEIAL events below 200 km that we observed seem to be not always correlated with particle precipitation and not embedded in ion outflows. Our results suggest that each of the three NEIAL generation theories might prevail during its favorite conditions. Master Thesis EISCAT Svalbard University of Tromsø: Munin Open Research Archive Svalbard |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 FYS-3900 |
spellingShingle |
VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 FYS-3900 Di Loreto, Massimo On the relation between type-II ion outflow and naturally enhanced ion acoustic lines in the polar ionosphere |
topic_facet |
VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 FYS-3900 |
description |
In this work we investigated the relation between type-II ion outflows and NEIALs. Currently, several ion outflows acceleration mechanisms and NEIALs generation theories have been proposed. In the first part of this thesis we review the most important works regarding these two processes. In the second part we present the results of our analysis, together with some unexpected events which were not previously described in the literature. We searched for ion outflow and NEIAL events in the data taken from the 42 m fixed antenna of the EISCAT Svalbard radar. We investigated field aligned ion velocities, electron densities, ion and electron temperatures, temperature ratios and ion fluxes in order to: (1) discuss the starting altitude of both NEIALs and outflows; (2) obtain information about the NEIALs’ generation theories, if they are compatible with our observations and at which altitude range they can be valid. We found some recurring situations for the NEIAL occurrence: particle precipitation and ion outflows are usually involved for events above 300 km, while the few NEIAL events below 200 km that we observed seem to be not always correlated with particle precipitation and not embedded in ion outflows. Our results suggest that each of the three NEIAL generation theories might prevail during its favorite conditions. |
format |
Master Thesis |
author |
Di Loreto, Massimo |
author_facet |
Di Loreto, Massimo |
author_sort |
Di Loreto, Massimo |
title |
On the relation between type-II ion outflow and naturally enhanced ion acoustic lines in the polar ionosphere |
title_short |
On the relation between type-II ion outflow and naturally enhanced ion acoustic lines in the polar ionosphere |
title_full |
On the relation between type-II ion outflow and naturally enhanced ion acoustic lines in the polar ionosphere |
title_fullStr |
On the relation between type-II ion outflow and naturally enhanced ion acoustic lines in the polar ionosphere |
title_full_unstemmed |
On the relation between type-II ion outflow and naturally enhanced ion acoustic lines in the polar ionosphere |
title_sort |
on the relation between type-ii ion outflow and naturally enhanced ion acoustic lines in the polar ionosphere |
publisher |
UiT Norges arktiske universitet |
publishDate |
2013 |
url |
https://hdl.handle.net/10037/6315 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
https://hdl.handle.net/10037/6315 URN:NBN:no-uit_munin_5953 |
op_rights |
openAccess Copyright 2013 The Author(s) |
_version_ |
1766400393616556032 |