Analysis of Observations near the Fourth Electron Gyrofrequency Heating Experiment in EISCAT
We present the observations of the artificial ionospheric heating experiment of EISCAT (European Incoherent Scatter Scientific Association) on 22 February 2012 in Tromsø, Norway. When the pump is operating near the fourth electron gyrofrequency, the UHF radar observation shows some strong enhancemen...
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ftdoajarticles:oai:doaj.org/article:9d19cf740a6a48168349ce78fa21fb15 2023-05-15T16:04:35+02:00 Analysis of Observations near the Fourth Electron Gyrofrequency Heating Experiment in EISCAT Zeyun Li Hanxian Fang Hongwei Gong Zhe Guo 2021-06-01T00:00:00Z https://doi.org/10.3390/universe7060191 https://doaj.org/article/9d19cf740a6a48168349ce78fa21fb15 EN eng MDPI AG https://www.mdpi.com/2218-1997/7/6/191 https://doaj.org/toc/2218-1997 doi:10.3390/universe7060191 2218-1997 https://doaj.org/article/9d19cf740a6a48168349ce78fa21fb15 Universe, Vol 7, Iss 191, p 191 (2021) heating ionosphere plasma line electron temperature electron density Elementary particle physics QC793-793.5 article 2021 ftdoajarticles https://doi.org/10.3390/universe7060191 2022-12-30T21:09:52Z We present the observations of the artificial ionospheric heating experiment of EISCAT (European Incoherent Scatter Scientific Association) on 22 February 2012 in Tromsø, Norway. When the pump is operating near the fourth electron gyrofrequency, the UHF radar observation shows some strong enhancements in electron temperature, electron density, ion line, and the outshifted plasma lines. Based on some existing theories, we find the following: first, Langmuir waves scattering off lower hybrid density fluctuations and strong Langmuir turbulence (SLT) in the Zakharov model cannot completely explain the outshifted plasma lines, but the data suggest that this phenomenon is related to the cascade of the pump wave and should be researched further; second, the spatiotemporal consistency between the enhancement in electron density/electron temperature reaches up to three to four times that of the undisturbed state and HF-enhanced ion lines (HFILs) suggest that SLT excited by parametric instability plays a significant role in superthermal electron formation and electron acceleration; third, some enhancements in HFILs and HF-induced plasma lines (HFPLs) are generated by parametric decay instability (PDI) during underdense heating in the third cycle, we suggest that this is due to the existence of a second cut-off in the upper hybrid dispersion relation as derived from a kinetic description. Article in Journal/Newspaper EISCAT Tromsø Directory of Open Access Journals: DOAJ Articles Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Norway Tromsø Zakharov ENVELOPE(130.617,130.617,64.650,64.650) Universe 7 6 191 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
heating ionosphere plasma line electron temperature electron density Elementary particle physics QC793-793.5 |
spellingShingle |
heating ionosphere plasma line electron temperature electron density Elementary particle physics QC793-793.5 Zeyun Li Hanxian Fang Hongwei Gong Zhe Guo Analysis of Observations near the Fourth Electron Gyrofrequency Heating Experiment in EISCAT |
topic_facet |
heating ionosphere plasma line electron temperature electron density Elementary particle physics QC793-793.5 |
description |
We present the observations of the artificial ionospheric heating experiment of EISCAT (European Incoherent Scatter Scientific Association) on 22 February 2012 in Tromsø, Norway. When the pump is operating near the fourth electron gyrofrequency, the UHF radar observation shows some strong enhancements in electron temperature, electron density, ion line, and the outshifted plasma lines. Based on some existing theories, we find the following: first, Langmuir waves scattering off lower hybrid density fluctuations and strong Langmuir turbulence (SLT) in the Zakharov model cannot completely explain the outshifted plasma lines, but the data suggest that this phenomenon is related to the cascade of the pump wave and should be researched further; second, the spatiotemporal consistency between the enhancement in electron density/electron temperature reaches up to three to four times that of the undisturbed state and HF-enhanced ion lines (HFILs) suggest that SLT excited by parametric instability plays a significant role in superthermal electron formation and electron acceleration; third, some enhancements in HFILs and HF-induced plasma lines (HFPLs) are generated by parametric decay instability (PDI) during underdense heating in the third cycle, we suggest that this is due to the existence of a second cut-off in the upper hybrid dispersion relation as derived from a kinetic description. |
format |
Article in Journal/Newspaper |
author |
Zeyun Li Hanxian Fang Hongwei Gong Zhe Guo |
author_facet |
Zeyun Li Hanxian Fang Hongwei Gong Zhe Guo |
author_sort |
Zeyun Li |
title |
Analysis of Observations near the Fourth Electron Gyrofrequency Heating Experiment in EISCAT |
title_short |
Analysis of Observations near the Fourth Electron Gyrofrequency Heating Experiment in EISCAT |
title_full |
Analysis of Observations near the Fourth Electron Gyrofrequency Heating Experiment in EISCAT |
title_fullStr |
Analysis of Observations near the Fourth Electron Gyrofrequency Heating Experiment in EISCAT |
title_full_unstemmed |
Analysis of Observations near the Fourth Electron Gyrofrequency Heating Experiment in EISCAT |
title_sort |
analysis of observations near the fourth electron gyrofrequency heating experiment in eiscat |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/universe7060191 https://doaj.org/article/9d19cf740a6a48168349ce78fa21fb15 |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) ENVELOPE(130.617,130.617,64.650,64.650) |
geographic |
Langmuir Norway Tromsø Zakharov |
geographic_facet |
Langmuir Norway Tromsø Zakharov |
genre |
EISCAT Tromsø |
genre_facet |
EISCAT Tromsø |
op_source |
Universe, Vol 7, Iss 191, p 191 (2021) |
op_relation |
https://www.mdpi.com/2218-1997/7/6/191 https://doaj.org/toc/2218-1997 doi:10.3390/universe7060191 2218-1997 https://doaj.org/article/9d19cf740a6a48168349ce78fa21fb15 |
op_doi |
https://doi.org/10.3390/universe7060191 |
container_title |
Universe |
container_volume |
7 |
container_issue |
6 |
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191 |
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1766400175387967488 |