Particle precipitation : effects on selected ionospheric phenomena
Papers 2 and 4 are not available in Munin: 2. T. Grydeland, B. Gustavsson, L. Baddeley, J. Lunde, and E. M. Blixt: 'Conditional integration of Incoherent Scattering in relation to flickering aurora', Journal of Geophysical Research (2008), vol.113, A08305, 8pp. Available at http://dx.doi.o...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Universitetet i Tromsø
2009
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Subjects: | |
Online Access: | https://hdl.handle.net/10037/4221 |
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record_format |
openpolar |
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::Physics of condensed matter: 436 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Kondenserte fasers fysikk: 436 VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism acoustics optics: 434 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme akustikk optikk: 434 VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453 VDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469 |
spellingShingle |
VDP::Mathematics and natural science: 400::Physics: 430::Physics of condensed matter: 436 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Kondenserte fasers fysikk: 436 VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism acoustics optics: 434 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme akustikk optikk: 434 VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453 VDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469 Lunde, June Particle precipitation : effects on selected ionospheric phenomena |
topic_facet |
VDP::Mathematics and natural science: 400::Physics: 430::Physics of condensed matter: 436 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Kondenserte fasers fysikk: 436 VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism acoustics optics: 434 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme akustikk optikk: 434 VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453 VDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469 |
description |
Papers 2 and 4 are not available in Munin: 2. T. Grydeland, B. Gustavsson, L. Baddeley, J. Lunde, and E. M. Blixt: 'Conditional integration of Incoherent Scattering in relation to flickering aurora', Journal of Geophysical Research (2008), vol.113, A08305, 8pp. Available at http://dx.doi.org/doi:10.1029/2008JA013039 4. B. Gustavsson, J. Lunde, and E. M. Blixt: 'Optical observations of flickering aurora and its spatio-temporal characteristics', Journal of Geophysical Research (2008), vol.113, A12317, 8pp. Available at http://dx.doi.org/10.1029/2008JA013515 The motivation behind this thesis has been to study particle precipitation from the Sun into the Earth’s upper atmosphere and its effects on selected ionospheric phenomena. Particles from the solar wind can enter the Earth's magnetosphere through magnetic merging, either at the sub-solar point, or at higher latitudes, depending on the configuration of the interplanetary magnetic field. This interaction can be studied from the ground at Svalbard, due to its fortuitous location beneath the magnetospheric cusp region on the dayside, and its location inside the polar cap during night-time. It has been studied how these precipitating particles act on the aurora and ion-acoustic waves in the ionized part of the atmosphere. The studies have been conducted using various methods, including extracting data from databases, running different experiments and building new instrumentation. The latter was a radiation detector for measuring Bremsstrahlung X-rays. The main instrument used for this study has been the EISCAT (European Incoherent SCATtering) radar located at Svalbard, together with an assortment of other ground based instruments such as photometers, riometers and magnetometers. In addition, particle instruments onboard satellites have been used as well as an X-ray instrument mounted on a balloon launched from Longyearbyen. Primarily, it is the effect of particle precipitation on large ion-acoustic waves that has been studied. These waves can be observed by advanced radar facilities, both from Svalbard and Tromsø (EISCAT) in the form of spectra known as natural enhanced ion acoustic lines (NEIALs). It has been found that the most energetic particle precipitation causes ion-acoustic waves which mainly propagate downward, while the less energetic part of the particle precipitation is related to ion-acoustic waves which propagate upward. In this project, large ion-acoustic waves have been discovered during night-time at very high latitudes where they were not expected to occur. Previously, these phenomena have only been observed during daytime at Svalbard. Furthermore, in this work, the infrared atomic oxygen emission line (844.6 nm) has been introduced as a new possible method to detect NEIALs in optical data. Particle precipitation sometimes cause flickering aurora, hence intensity variation and the apparent motion of flickering spots in the aurora have been studied. Finally, precipitating particles typically consists of electrons and ions, and in this study, an example is given on of how the merging of the Earth’s and Sun’s magnetic fields guide the precipitation. |
format |
Doctoral or Postdoctoral Thesis |
author |
Lunde, June |
author_facet |
Lunde, June |
author_sort |
Lunde, June |
title |
Particle precipitation : effects on selected ionospheric phenomena |
title_short |
Particle precipitation : effects on selected ionospheric phenomena |
title_full |
Particle precipitation : effects on selected ionospheric phenomena |
title_fullStr |
Particle precipitation : effects on selected ionospheric phenomena |
title_full_unstemmed |
Particle precipitation : effects on selected ionospheric phenomena |
title_sort |
particle precipitation : effects on selected ionospheric phenomena |
publisher |
Universitetet i Tromsø |
publishDate |
2009 |
url |
https://hdl.handle.net/10037/4221 |
long_lat |
ENVELOPE(50.467,50.467,-66.967,-66.967) |
geographic |
Svalbard Longyearbyen Tromsø Lunde |
geographic_facet |
Svalbard Longyearbyen Tromsø Lunde |
genre |
EISCAT Longyearbyen Svalbard Tromsø Lunde |
genre_facet |
EISCAT Longyearbyen Svalbard Tromsø Lunde |
op_relation |
978-82-8236-012-8 https://hdl.handle.net/10037/4221 URN:NBN:no-uit_munin_3936 |
op_rights |
openAccess Copyright 2009 The Author(s) |
_version_ |
1766400411696103424 |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/4221 2023-05-15T16:04:47+02:00 Particle precipitation : effects on selected ionospheric phenomena Lunde, June 2009-11-26 https://hdl.handle.net/10037/4221 eng eng Universitetet i Tromsø University of Tromsø 978-82-8236-012-8 https://hdl.handle.net/10037/4221 URN:NBN:no-uit_munin_3936 openAccess Copyright 2009 The Author(s) VDP::Mathematics and natural science: 400::Physics: 430::Physics of condensed matter: 436 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Kondenserte fasers fysikk: 436 VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism acoustics optics: 434 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme akustikk optikk: 434 VDP::Mathematics and natural science: 400::Geosciences: 450::Meteorology: 453 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Meteorologi: 453 VDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469 Doctoral thesis Doktorgradsavhandling 2009 ftunivtroemsoe 2021-06-25T17:53:18Z Papers 2 and 4 are not available in Munin: 2. T. Grydeland, B. Gustavsson, L. Baddeley, J. Lunde, and E. M. Blixt: 'Conditional integration of Incoherent Scattering in relation to flickering aurora', Journal of Geophysical Research (2008), vol.113, A08305, 8pp. Available at http://dx.doi.org/doi:10.1029/2008JA013039 4. B. Gustavsson, J. Lunde, and E. M. Blixt: 'Optical observations of flickering aurora and its spatio-temporal characteristics', Journal of Geophysical Research (2008), vol.113, A12317, 8pp. Available at http://dx.doi.org/10.1029/2008JA013515 The motivation behind this thesis has been to study particle precipitation from the Sun into the Earth’s upper atmosphere and its effects on selected ionospheric phenomena. Particles from the solar wind can enter the Earth's magnetosphere through magnetic merging, either at the sub-solar point, or at higher latitudes, depending on the configuration of the interplanetary magnetic field. This interaction can be studied from the ground at Svalbard, due to its fortuitous location beneath the magnetospheric cusp region on the dayside, and its location inside the polar cap during night-time. It has been studied how these precipitating particles act on the aurora and ion-acoustic waves in the ionized part of the atmosphere. The studies have been conducted using various methods, including extracting data from databases, running different experiments and building new instrumentation. The latter was a radiation detector for measuring Bremsstrahlung X-rays. The main instrument used for this study has been the EISCAT (European Incoherent SCATtering) radar located at Svalbard, together with an assortment of other ground based instruments such as photometers, riometers and magnetometers. In addition, particle instruments onboard satellites have been used as well as an X-ray instrument mounted on a balloon launched from Longyearbyen. Primarily, it is the effect of particle precipitation on large ion-acoustic waves that has been studied. These waves can be observed by advanced radar facilities, both from Svalbard and Tromsø (EISCAT) in the form of spectra known as natural enhanced ion acoustic lines (NEIALs). It has been found that the most energetic particle precipitation causes ion-acoustic waves which mainly propagate downward, while the less energetic part of the particle precipitation is related to ion-acoustic waves which propagate upward. In this project, large ion-acoustic waves have been discovered during night-time at very high latitudes where they were not expected to occur. Previously, these phenomena have only been observed during daytime at Svalbard. Furthermore, in this work, the infrared atomic oxygen emission line (844.6 nm) has been introduced as a new possible method to detect NEIALs in optical data. Particle precipitation sometimes cause flickering aurora, hence intensity variation and the apparent motion of flickering spots in the aurora have been studied. Finally, precipitating particles typically consists of electrons and ions, and in this study, an example is given on of how the merging of the Earth’s and Sun’s magnetic fields guide the precipitation. Doctoral or Postdoctoral Thesis EISCAT Longyearbyen Svalbard Tromsø Lunde University of Tromsø: Munin Open Research Archive Svalbard Longyearbyen Tromsø Lunde ENVELOPE(50.467,50.467,-66.967,-66.967) |