Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere
Experimental results from three ionospheric HF pumping experiments in overdense E or F regions are summarized. The experiments were conducted by the use of the EISCAT HF Heating facility located near Tromsø, Norway, allowing HF pumping the ionosphere in a near geomagnetic field-aligned direction. Di...
Published in: | Annales Geophysicae |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2005
|
Subjects: | |
Online Access: | https://doi.org/10.5194/angeo-23-87-2005 https://doaj.org/article/fbeeb704832247f8bb6c7b462a313f62 |
id |
ftdoajarticles:oai:doaj.org/article:fbeeb704832247f8bb6c7b462a313f62 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:fbeeb704832247f8bb6c7b462a313f62 2023-05-15T16:04:48+02:00 Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere N. F. Blagoveshchenskaya T. D. Borisova V. A. Kornienko B. Thidé M. T. Rietveld M. J. Kosch T. Bösinger 2005-01-01T00:00:00Z https://doi.org/10.5194/angeo-23-87-2005 https://doaj.org/article/fbeeb704832247f8bb6c7b462a313f62 EN eng Copernicus Publications https://www.ann-geophys.net/23/87/2005/angeo-23-87-2005.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-23-87-2005 0992-7689 1432-0576 https://doaj.org/article/fbeeb704832247f8bb6c7b462a313f62 Annales Geophysicae, Vol 23, Pp 87-100 (2005) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2005 ftdoajarticles https://doi.org/10.5194/angeo-23-87-2005 2022-12-31T01:32:11Z Experimental results from three ionospheric HF pumping experiments in overdense E or F regions are summarized. The experiments were conducted by the use of the EISCAT HF Heating facility located near Tromsø, Norway, allowing HF pumping the ionosphere in a near geomagnetic field-aligned direction. Distinctive features related to auroral activations in the course of the experiments are identified. Typical features observed in all experiments are the following: generation of scattered components in dynamic HF radio scatter Doppler spectra; strong increase of ion temperatures T i and local ionospheric electric field E 0 modification of the auroral arc and local spiral-like formation. However, some effects were observed only when the HF pump wave was reflected from the F2 layer. Among them are the generation of intense field-aligned ion outflows, and a strong increase in the electron temperature T e with altitude. A possible scenario for the substorm triggering due to HF pumping into an auroral ionosphere is discussed. The authors present their interpretation of the data as follows. It is suggested that two populations of charged particles are at play. One of them is the runaway population of electrons and ions from the ionosphere caused by the effects of the powerful HF radio wave. The other is the population of electrons that precipitate from the magnetosphere. It is shown that the hydrodynamical equilibrium was disrupted due to the effects of the HF pumping. We estimate that the parallel electric field can reach values of the order of 30mV/m during substorm triggering. Article in Journal/Newspaper EISCAT Tromsø Directory of Open Access Journals: DOAJ Articles Norway Tromsø Annales Geophysicae 23 1 87 100 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 N. F. Blagoveshchenskaya T. D. Borisova V. A. Kornienko B. Thidé M. T. Rietveld M. J. Kosch T. Bösinger Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Experimental results from three ionospheric HF pumping experiments in overdense E or F regions are summarized. The experiments were conducted by the use of the EISCAT HF Heating facility located near Tromsø, Norway, allowing HF pumping the ionosphere in a near geomagnetic field-aligned direction. Distinctive features related to auroral activations in the course of the experiments are identified. Typical features observed in all experiments are the following: generation of scattered components in dynamic HF radio scatter Doppler spectra; strong increase of ion temperatures T i and local ionospheric electric field E 0 modification of the auroral arc and local spiral-like formation. However, some effects were observed only when the HF pump wave was reflected from the F2 layer. Among them are the generation of intense field-aligned ion outflows, and a strong increase in the electron temperature T e with altitude. A possible scenario for the substorm triggering due to HF pumping into an auroral ionosphere is discussed. The authors present their interpretation of the data as follows. It is suggested that two populations of charged particles are at play. One of them is the runaway population of electrons and ions from the ionosphere caused by the effects of the powerful HF radio wave. The other is the population of electrons that precipitate from the magnetosphere. It is shown that the hydrodynamical equilibrium was disrupted due to the effects of the HF pumping. We estimate that the parallel electric field can reach values of the order of 30mV/m during substorm triggering. |
format |
Article in Journal/Newspaper |
author |
N. F. Blagoveshchenskaya T. D. Borisova V. A. Kornienko B. Thidé M. T. Rietveld M. J. Kosch T. Bösinger |
author_facet |
N. F. Blagoveshchenskaya T. D. Borisova V. A. Kornienko B. Thidé M. T. Rietveld M. J. Kosch T. Bösinger |
author_sort |
N. F. Blagoveshchenskaya |
title |
Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere |
title_short |
Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere |
title_full |
Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere |
title_fullStr |
Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere |
title_full_unstemmed |
Phenomena in the ionosphere-magnetosphere system induced by injection of powerful HF radio waves into nightside auroral ionosphere |
title_sort |
phenomena in the ionosphere-magnetosphere system induced by injection of powerful hf radio waves into nightside auroral ionosphere |
publisher |
Copernicus Publications |
publishDate |
2005 |
url |
https://doi.org/10.5194/angeo-23-87-2005 https://doaj.org/article/fbeeb704832247f8bb6c7b462a313f62 |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
EISCAT Tromsø |
genre_facet |
EISCAT Tromsø |
op_source |
Annales Geophysicae, Vol 23, Pp 87-100 (2005) |
op_relation |
https://www.ann-geophys.net/23/87/2005/angeo-23-87-2005.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-23-87-2005 0992-7689 1432-0576 https://doaj.org/article/fbeeb704832247f8bb6c7b462a313f62 |
op_doi |
https://doi.org/10.5194/angeo-23-87-2005 |
container_title |
Annales Geophysicae |
container_volume |
23 |
container_issue |
1 |
container_start_page |
87 |
op_container_end_page |
100 |
_version_ |
1766400425263628288 |