Geophysical phenomena during an ionospheric modification experiment at Tromsø, Norway

International audience We present an analysis of phenomena observed by HF distance-diagnostic tools located in St. Petersburg combined with multi-instrument observation at Tromsø in the HF modified ionosphere during a magnetospheric substorm. The observed phenomena that occurred during the Tromsø he...

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Main Authors: Blagoveshchenskaya, N. F., Kornienko, V. A., Petlenko, A. V., Brekke, A., Rietveld, M. T.
Other Authors: Arctic and Antarctic Research Institute (AARI), Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet), The Auroral Observatory, University of Tromsø (UiT), EISCAT Scientific Association Norway
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 1998
Subjects:
Online Access:https://hal.science/hal-00316449
https://hal.science/hal-00316449/document
https://hal.science/hal-00316449/file/angeo-16-1212-1998.pdf
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spelling ftccsdartic:oai:HAL:hal-00316449v1 2023-11-12T04:27:29+01:00 Geophysical phenomena during an ionospheric modification experiment at Tromsø, Norway Blagoveshchenskaya, N. F. Kornienko, V. A. Petlenko, A. V. Brekke, A. Rietveld, M. T. Arctic and Antarctic Research Institute (AARI) Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet) The Auroral Observatory University of Tromsø (UiT) EISCAT Scientific Association Norway 1998 https://hal.science/hal-00316449 https://hal.science/hal-00316449/document https://hal.science/hal-00316449/file/angeo-16-1212-1998.pdf en eng HAL CCSD European Geosciences Union hal-00316449 https://hal.science/hal-00316449 https://hal.science/hal-00316449/document https://hal.science/hal-00316449/file/angeo-16-1212-1998.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316449 Annales Geophysicae, 1998, 16 (10), pp.1212-1225 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1998 ftccsdartic 2023-10-21T23:08:27Z International audience We present an analysis of phenomena observed by HF distance-diagnostic tools located in St. Petersburg combined with multi-instrument observation at Tromsø in the HF modified ionosphere during a magnetospheric substorm. The observed phenomena that occurred during the Tromsø heating experiment in the nightside auroral E s region of the ionosphere depend on the phase of substorm. The heating excited small-scale field-aligned irregularities in the E region responsible for field-aligned scattering of diagnostic HF waves. The equipment used in the experiment was sensitive to electron density irregularities with wavelengths 12?15 m across the geomagnetic field lines. Analysis of the Doppler measurement data shows the appearance of quasiperiodic variations with a Doppler frequency shift, f d and periods about 100?120 s during the heating cycle coinciding in time with the first substorm activation and initiation of the upward field-aligned currents. A relationship between wave variations in f d and magnetic pulsations in the Y -component of the geomagnetic field at Tromsø was detected. The analysis of the magnetic field variations from the IMAGE magnetometer stations shows that ULF waves occurred, not only at Tromsø, but in the adjacent area bounded by geographical latitudes from 70.5° to 68° and longitudes from 16° to 27°. It is suggested that the ULF observed can result from superposition of the natural and heater-induced ULF waves. During the substorm expansion a strong stimulated electromagnetic emission (SEE) at the third harmonic of the downshifted maximum frequency was found. It is believed that SEE is accompanied by excitation of the VLF waves penetrating into magnetosphere and stimulating the precipitation of the energetic electrons (10?40 keV) of about 1-min duration. This is due to a cyclotron resonant interaction of natural precipitating electrons (1?10 keV) with heater-induced whistler waves in the magnetosphere. It is reasonable to suppose that a new substorm activation, exactly ... Article in Journal/Newspaper Tromsø Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Norway Tromsø The ''Y'' ENVELOPE(-112.453,-112.453,57.591,57.591)
institution Open Polar
collection Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
op_collection_id ftccsdartic
language English
topic [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
spellingShingle [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Blagoveshchenskaya, N. F.
Kornienko, V. A.
Petlenko, A. V.
Brekke, A.
Rietveld, M. T.
Geophysical phenomena during an ionospheric modification experiment at Tromsø, Norway
topic_facet [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
description International audience We present an analysis of phenomena observed by HF distance-diagnostic tools located in St. Petersburg combined with multi-instrument observation at Tromsø in the HF modified ionosphere during a magnetospheric substorm. The observed phenomena that occurred during the Tromsø heating experiment in the nightside auroral E s region of the ionosphere depend on the phase of substorm. The heating excited small-scale field-aligned irregularities in the E region responsible for field-aligned scattering of diagnostic HF waves. The equipment used in the experiment was sensitive to electron density irregularities with wavelengths 12?15 m across the geomagnetic field lines. Analysis of the Doppler measurement data shows the appearance of quasiperiodic variations with a Doppler frequency shift, f d and periods about 100?120 s during the heating cycle coinciding in time with the first substorm activation and initiation of the upward field-aligned currents. A relationship between wave variations in f d and magnetic pulsations in the Y -component of the geomagnetic field at Tromsø was detected. The analysis of the magnetic field variations from the IMAGE magnetometer stations shows that ULF waves occurred, not only at Tromsø, but in the adjacent area bounded by geographical latitudes from 70.5° to 68° and longitudes from 16° to 27°. It is suggested that the ULF observed can result from superposition of the natural and heater-induced ULF waves. During the substorm expansion a strong stimulated electromagnetic emission (SEE) at the third harmonic of the downshifted maximum frequency was found. It is believed that SEE is accompanied by excitation of the VLF waves penetrating into magnetosphere and stimulating the precipitation of the energetic electrons (10?40 keV) of about 1-min duration. This is due to a cyclotron resonant interaction of natural precipitating electrons (1?10 keV) with heater-induced whistler waves in the magnetosphere. It is reasonable to suppose that a new substorm activation, exactly ...
author2 Arctic and Antarctic Research Institute (AARI)
Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet)
The Auroral Observatory
University of Tromsø (UiT)
EISCAT Scientific Association Norway
format Article in Journal/Newspaper
author Blagoveshchenskaya, N. F.
Kornienko, V. A.
Petlenko, A. V.
Brekke, A.
Rietveld, M. T.
author_facet Blagoveshchenskaya, N. F.
Kornienko, V. A.
Petlenko, A. V.
Brekke, A.
Rietveld, M. T.
author_sort Blagoveshchenskaya, N. F.
title Geophysical phenomena during an ionospheric modification experiment at Tromsø, Norway
title_short Geophysical phenomena during an ionospheric modification experiment at Tromsø, Norway
title_full Geophysical phenomena during an ionospheric modification experiment at Tromsø, Norway
title_fullStr Geophysical phenomena during an ionospheric modification experiment at Tromsø, Norway
title_full_unstemmed Geophysical phenomena during an ionospheric modification experiment at Tromsø, Norway
title_sort geophysical phenomena during an ionospheric modification experiment at tromsø, norway
publisher HAL CCSD
publishDate 1998
url https://hal.science/hal-00316449
https://hal.science/hal-00316449/document
https://hal.science/hal-00316449/file/angeo-16-1212-1998.pdf
long_lat ENVELOPE(-112.453,-112.453,57.591,57.591)
geographic Norway
Tromsø
The ''Y''
geographic_facet Norway
Tromsø
The ''Y''
genre Tromsø
genre_facet Tromsø
op_source ISSN: 0992-7689
EISSN: 1432-0576
Annales Geophysicae
https://hal.science/hal-00316449
Annales Geophysicae, 1998, 16 (10), pp.1212-1225
op_relation hal-00316449
https://hal.science/hal-00316449
https://hal.science/hal-00316449/document
https://hal.science/hal-00316449/file/angeo-16-1212-1998.pdf
op_rights info:eu-repo/semantics/OpenAccess
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