Auroral pulsations and accompanying VLF emissions
International audience Results of simultaneous TV observations of pulsating auroral patches and ELF-VLF-emissions in the morning sector carried out in Sodankylä (Finland) on February 15, 1991 are presented. Auroral pulsating activity was typical having pulsating patches with characteristic periods o...
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ftccsdartic:oai:HAL:hal-00316494v1 2023-11-12T04:26:10+01:00 Auroral pulsations and accompanying VLF emissions Tagirov, V. R. Ismagilov, V. S. Titova, E. E. Arinin, V. A. Perlikov, A. M. Manninen, J. Turunen, T. Kaila, K. Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Russian Federal Nuclear Center Sarov Geophysical Observatory University of Oulu 1999 https://hal.science/hal-00316494 https://hal.science/hal-00316494/document https://hal.science/hal-00316494/file/angeo-17-66-1999.pdf en eng HAL CCSD European Geosciences Union hal-00316494 https://hal.science/hal-00316494 https://hal.science/hal-00316494/document https://hal.science/hal-00316494/file/angeo-17-66-1999.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316494 Annales Geophysicae, 1999, 17 (1), pp.66-78 [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 1999 ftccsdartic 2023-10-21T23:08:27Z International audience Results of simultaneous TV observations of pulsating auroral patches and ELF-VLF-emissions in the morning sector carried out in Sodankylä (Finland) on February 15, 1991 are presented. Auroral pulsating activity was typical having pulsating patches with characteristic periods of about 7 s. Narrow-band hiss emissions and chorus elements at intervals of 0.3?0.4 s formed the main ELF-VLF activity in the frequency range 1.0?2.5 kHz at the same time. The analysis of auroral images with time resolution of 0.04 s allowed perfectly separate analysis of spatial and temporal variations in the auroral luminosity. Mutual correspondence between the behaviour of the luminous auroral patches and the appearance of ELF noise type hiss emissions and VLF chorus trains was found in two intervals chosen for analysis. While the hiss emissions were associated with the appearance of luminosity inside a limited area close to the zenith, the structured VLF emissions were accompanied by rapid motion of luminosity inside the area. The spatial dimension of the pulsating area was about 45?50 km and luminosity propagated inside it with velocity of about 10?12 kms. We discuss a new approach to explain the 5?15 s auroral pulsation based on the theory of flowing cyclotron maser and relaxation characteristics of ionosphere. Article in Journal/Newspaper Sodankylä Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) |
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 Tagirov, V. R. Ismagilov, V. S. Titova, E. E. Arinin, V. A. Perlikov, A. M. Manninen, J. Turunen, T. Kaila, K. Auroral pulsations and accompanying VLF emissions |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Results of simultaneous TV observations of pulsating auroral patches and ELF-VLF-emissions in the morning sector carried out in Sodankylä (Finland) on February 15, 1991 are presented. Auroral pulsating activity was typical having pulsating patches with characteristic periods of about 7 s. Narrow-band hiss emissions and chorus elements at intervals of 0.3?0.4 s formed the main ELF-VLF activity in the frequency range 1.0?2.5 kHz at the same time. The analysis of auroral images with time resolution of 0.04 s allowed perfectly separate analysis of spatial and temporal variations in the auroral luminosity. Mutual correspondence between the behaviour of the luminous auroral patches and the appearance of ELF noise type hiss emissions and VLF chorus trains was found in two intervals chosen for analysis. While the hiss emissions were associated with the appearance of luminosity inside a limited area close to the zenith, the structured VLF emissions were accompanied by rapid motion of luminosity inside the area. The spatial dimension of the pulsating area was about 45?50 km and luminosity propagated inside it with velocity of about 10?12 kms. We discuss a new approach to explain the 5?15 s auroral pulsation based on the theory of flowing cyclotron maser and relaxation characteristics of ionosphere. |
author2 |
Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Russian Federal Nuclear Center Sarov Geophysical Observatory University of Oulu |
format |
Article in Journal/Newspaper |
author |
Tagirov, V. R. Ismagilov, V. S. Titova, E. E. Arinin, V. A. Perlikov, A. M. Manninen, J. Turunen, T. Kaila, K. |
author_facet |
Tagirov, V. R. Ismagilov, V. S. Titova, E. E. Arinin, V. A. Perlikov, A. M. Manninen, J. Turunen, T. Kaila, K. |
author_sort |
Tagirov, V. R. |
title |
Auroral pulsations and accompanying VLF emissions |
title_short |
Auroral pulsations and accompanying VLF emissions |
title_full |
Auroral pulsations and accompanying VLF emissions |
title_fullStr |
Auroral pulsations and accompanying VLF emissions |
title_full_unstemmed |
Auroral pulsations and accompanying VLF emissions |
title_sort |
auroral pulsations and accompanying vlf emissions |
publisher |
HAL CCSD |
publishDate |
1999 |
url |
https://hal.science/hal-00316494 https://hal.science/hal-00316494/document https://hal.science/hal-00316494/file/angeo-17-66-1999.pdf |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Sodankylä |
geographic_facet |
Sodankylä |
genre |
Sodankylä |
genre_facet |
Sodankylä |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316494 Annales Geophysicae, 1999, 17 (1), pp.66-78 |
op_relation |
hal-00316494 https://hal.science/hal-00316494 https://hal.science/hal-00316494/document https://hal.science/hal-00316494/file/angeo-17-66-1999.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782340251819180032 |