Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements
Source at https://doi.org/10.1029/2018JA025636 . Differential energy flux of electrons precipitating into the high‐latitude ionosphere can be estimated from incoherent scatter radar observations of the ionospheric electron density profile. We present a method called ELSPEC for electron spectrum esti...
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Online Access: | https://hdl.handle.net/10037/14961 https://doi.org/10.1029/2018JA025636 |
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ftunivtroemsoe:oai:munin.uit.no:10037/14961 2023-05-15T16:04:37+02:00 Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements Virtanen, Ilkka I. Gustavsson, Björn Johan Aikio, Anita Kero, Antti Asamura, Kazushi Ogawa, Yasunobu 2018-07-23 https://hdl.handle.net/10037/14961 https://doi.org/10.1029/2018JA025636 eng eng American Geophysical Union (AGU) Journal of Geophysical Research - Space Physics Virtanen, I.I., Gustavsson, B., Aikio, A., Kero, A., Asamura, K. & Ogawa, Y. (2018). Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements. Journal of Geophysical Research - Space Physics, 123 (8), 6865-6887. https://doi.org/10.1029/2018JA025636 FRIDAID 1625490 doi:10.1029/2018JA025636 2169-9380 2169-9402 https://hdl.handle.net/10037/14961 openAccess VDP::Mathematics and natural science: 400::Physics: 430 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430 Journal article Tidsskriftartikkel Peer reviewed 2018 ftunivtroemsoe https://doi.org/10.1029/2018JA025636 2021-06-25T17:56:26Z Source at https://doi.org/10.1029/2018JA025636 . Differential energy flux of electrons precipitating into the high‐latitude ionosphere can be estimated from incoherent scatter radar observations of the ionospheric electron density profile. We present a method called ELSPEC for electron spectrum estimation from incoherent scatter radar measurements, which is based on integration of the electron continuity equation and spectrum model selection by means of the Akaike information criterion. This approach allows us to use data with almost arbitrary time resolutions, enables spectrum estimation with dense energy grids, avoids noise amplifications in numerical derivatives, and yields statistical error estimates for all the output parameters, including the number and energy fluxes and upward field‐aligned currents carried by the precipitating electrons. The technique is targeted for auroral energies, 1–100 keV, which ionize the atmosphere mainly between 80 and 150 km altitudes. We validate the technique by means of a simulation study, which shows that Maxwellian, kappa, and mono‐energetic spectra, as well as combinations of those, can be reproduced. Comparison study for two conjugate satellite measurements to the EISCAT UHF radar are shown, for Reimei and Swarm, showing an agreement with the results. Finally, an example of a 2‐hr measurement by the EISCAT radar is shown, during which we observe a variety of precipitation characteristics, from soft background precipitation to mono‐energetic spectra with peak energies up to 60 keV. The upward field‐aligned current varies from 0 to 10 μ Am −2 and the total energy flux from 0 to 250 mWm −2 . Article in Journal/Newspaper EISCAT University of Tromsø: Munin Open Research Archive Journal of Geophysical Research: Space Physics 123 8 6865 6887 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Physics: 430 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430 |
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VDP::Mathematics and natural science: 400::Physics: 430 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430 Virtanen, Ilkka I. Gustavsson, Björn Johan Aikio, Anita Kero, Antti Asamura, Kazushi Ogawa, Yasunobu Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements |
topic_facet |
VDP::Mathematics and natural science: 400::Physics: 430 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430 |
description |
Source at https://doi.org/10.1029/2018JA025636 . Differential energy flux of electrons precipitating into the high‐latitude ionosphere can be estimated from incoherent scatter radar observations of the ionospheric electron density profile. We present a method called ELSPEC for electron spectrum estimation from incoherent scatter radar measurements, which is based on integration of the electron continuity equation and spectrum model selection by means of the Akaike information criterion. This approach allows us to use data with almost arbitrary time resolutions, enables spectrum estimation with dense energy grids, avoids noise amplifications in numerical derivatives, and yields statistical error estimates for all the output parameters, including the number and energy fluxes and upward field‐aligned currents carried by the precipitating electrons. The technique is targeted for auroral energies, 1–100 keV, which ionize the atmosphere mainly between 80 and 150 km altitudes. We validate the technique by means of a simulation study, which shows that Maxwellian, kappa, and mono‐energetic spectra, as well as combinations of those, can be reproduced. Comparison study for two conjugate satellite measurements to the EISCAT UHF radar are shown, for Reimei and Swarm, showing an agreement with the results. Finally, an example of a 2‐hr measurement by the EISCAT radar is shown, during which we observe a variety of precipitation characteristics, from soft background precipitation to mono‐energetic spectra with peak energies up to 60 keV. The upward field‐aligned current varies from 0 to 10 μ Am −2 and the total energy flux from 0 to 250 mWm −2 . |
format |
Article in Journal/Newspaper |
author |
Virtanen, Ilkka I. Gustavsson, Björn Johan Aikio, Anita Kero, Antti Asamura, Kazushi Ogawa, Yasunobu |
author_facet |
Virtanen, Ilkka I. Gustavsson, Björn Johan Aikio, Anita Kero, Antti Asamura, Kazushi Ogawa, Yasunobu |
author_sort |
Virtanen, Ilkka I. |
title |
Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements |
title_short |
Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements |
title_full |
Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements |
title_fullStr |
Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements |
title_full_unstemmed |
Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements |
title_sort |
electron energy spectrum and auroral power estimation from incoherent scatter radar measurements |
publisher |
American Geophysical Union (AGU) |
publishDate |
2018 |
url |
https://hdl.handle.net/10037/14961 https://doi.org/10.1029/2018JA025636 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
Journal of Geophysical Research - Space Physics Virtanen, I.I., Gustavsson, B., Aikio, A., Kero, A., Asamura, K. & Ogawa, Y. (2018). Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements. Journal of Geophysical Research - Space Physics, 123 (8), 6865-6887. https://doi.org/10.1029/2018JA025636 FRIDAID 1625490 doi:10.1029/2018JA025636 2169-9380 2169-9402 https://hdl.handle.net/10037/14961 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1029/2018JA025636 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
123 |
container_issue |
8 |
container_start_page |
6865 |
op_container_end_page |
6887 |
_version_ |
1766400229995708416 |