First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT
We have developed an active ground-based technique to estimate the steady state field-aligned anomalous electric field (E*) in the topside ionosphere, up to ~600 km, using the European Incoherent Scatter (EISCAT) ionospheric modification facility and UHF incoherent scatter radar. When pumping the io...
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Online Access: | https://hdl.handle.net/10037/25720 https://doi.org/10.1002/2014GL061679 |
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ftunivtroemsoe:oai:munin.uit.no:10037/25720 2023-05-15T16:04:31+02:00 First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT Kosch, Michael Vickers, Hannah Ogawa, Yasunobu Senior, Andrew Blagoveshchenskaya, Natalya 2014-10-24 https://hdl.handle.net/10037/25720 https://doi.org/10.1002/2014GL061679 eng eng Wiley Geophysical Research Letters Kosch M, Vickers H, Ogawa, Senior, Blagoveshchenskaya. First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT. Geophysical Research Letters. 2014;41(21):7427-7435 FRIDAID 1185734 doi:10.1002/2014GL061679 0094-8276 1944-8007 https://hdl.handle.net/10037/25720 openAccess Copyright 2014 The Author(s) Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2014 ftunivtroemsoe https://doi.org/10.1002/2014GL061679 2022-07-06T22:58:56Z We have developed an active ground-based technique to estimate the steady state field-aligned anomalous electric field (E*) in the topside ionosphere, up to ~600 km, using the European Incoherent Scatter (EISCAT) ionospheric modification facility and UHF incoherent scatter radar. When pumping the ionosphere with high-power high-frequency radio waves, the F region electron temperature is significantly raised, increasing the plasma pressure gradient in the topside ionosphere, resulting in ion upflow along the magnetic field line. We estimate E* using a modified ion momentum equation and the Mass Spectrometer Incoherent Scatter model. From an experiment on 23 October 2013, E* points downward with an average amplitude of ~1.6 μV/m, becoming weaker at higher altitudes. The mechanism for anomalous resistivity is thought to be low-frequency ion acoustic waves generated by the pump-induced flux of suprathermal electrons. These high-energy electrons are produced near the pump wave reflection altitude by plasma resonance and also result in observed artificially induced optical emissions. Article in Journal/Newspaper EISCAT University of Tromsø: Munin Open Research Archive Geophysical Research Letters 41 21 7427 7435 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
We have developed an active ground-based technique to estimate the steady state field-aligned anomalous electric field (E*) in the topside ionosphere, up to ~600 km, using the European Incoherent Scatter (EISCAT) ionospheric modification facility and UHF incoherent scatter radar. When pumping the ionosphere with high-power high-frequency radio waves, the F region electron temperature is significantly raised, increasing the plasma pressure gradient in the topside ionosphere, resulting in ion upflow along the magnetic field line. We estimate E* using a modified ion momentum equation and the Mass Spectrometer Incoherent Scatter model. From an experiment on 23 October 2013, E* points downward with an average amplitude of ~1.6 μV/m, becoming weaker at higher altitudes. The mechanism for anomalous resistivity is thought to be low-frequency ion acoustic waves generated by the pump-induced flux of suprathermal electrons. These high-energy electrons are produced near the pump wave reflection altitude by plasma resonance and also result in observed artificially induced optical emissions. |
format |
Article in Journal/Newspaper |
author |
Kosch, Michael Vickers, Hannah Ogawa, Yasunobu Senior, Andrew Blagoveshchenskaya, Natalya |
spellingShingle |
Kosch, Michael Vickers, Hannah Ogawa, Yasunobu Senior, Andrew Blagoveshchenskaya, Natalya First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT |
author_facet |
Kosch, Michael Vickers, Hannah Ogawa, Yasunobu Senior, Andrew Blagoveshchenskaya, Natalya |
author_sort |
Kosch, Michael |
title |
First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT |
title_short |
First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT |
title_full |
First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT |
title_fullStr |
First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT |
title_full_unstemmed |
First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT |
title_sort |
first observation of the anomalous electric field in the topside ionosphere by ionospheric modification over eiscat |
publisher |
Wiley |
publishDate |
2014 |
url |
https://hdl.handle.net/10037/25720 https://doi.org/10.1002/2014GL061679 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
Geophysical Research Letters Kosch M, Vickers H, Ogawa, Senior, Blagoveshchenskaya. First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT. Geophysical Research Letters. 2014;41(21):7427-7435 FRIDAID 1185734 doi:10.1002/2014GL061679 0094-8276 1944-8007 https://hdl.handle.net/10037/25720 |
op_rights |
openAccess Copyright 2014 The Author(s) |
op_doi |
https://doi.org/10.1002/2014GL061679 |
container_title |
Geophysical Research Letters |
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41 |
container_issue |
21 |
container_start_page |
7427 |
op_container_end_page |
7435 |
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1766400100473503744 |