Nonstationary pearl pulsations as a signature of magnetospheric disturbances
We analyse long-lasting (several hours) Pc1 pearl pulsations with decreasing, increasing or constant central frequencies. We show that nonstationary pearl events (those with either decreasing or increasing central frequency) are observed simultaneously with increasing auroral magnetic activity a...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2000-05-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/18/517/2000/angeo-18-517-2000.pdf |
| _version_ | 1829508016306651136 |
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| author | F. Z. Feygin F. Z. Feygin F. Z. Feygin N. G. Kleimenova O. A. Pokhotelov M. Parrot K. Prikner K. Mursula J. Kangas T. Pikkarainen |
| author_facet | F. Z. Feygin F. Z. Feygin F. Z. Feygin N. G. Kleimenova O. A. Pokhotelov M. Parrot K. Prikner K. Mursula J. Kangas T. Pikkarainen |
| author_sort | F. Z. Feygin |
| collection | DOAJ |
| description | We analyse long-lasting (several hours) Pc1
pearl pulsations with decreasing, increasing or constant central frequencies. We
show that nonstationary pearl events (those with either decreasing or increasing
central frequency) are observed simultaneously with increasing auroral magnetic
activity at the nightside magnetosphere while the stationary events (constant
central frequency) correspond to quiet magnetic conditions. Events with
decreasing central frequency are observed mostly in the late morning and daytime
whereas events with increasing central frequency appear either early in the
morning or in the afternoon. We explain the diurnal distribution of the
nonstationary pearl pulsations in terms of proton drifts depending on magnetic
activity, and evaluate the magnetospheric electric field based on the variation
of the central frequency of pearl pulsations.<br><br><b>Key words: </b>Magnetospheric physics (magnetospheric
configuration and dynamics; plasma waves and instabilities) |
| first_indexed | 2024-12-16T11:19:09Z |
| format | Article |
| id | doaj.art-613c855dd9ea4cf4ba3b7e1b3afb837d |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-16T11:19:09Z |
| publishDate | 2000-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-613c855dd9ea4cf4ba3b7e1b3afb837d2022-12-21T22:33:30ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762000-05-011851752210.1007/s00585-000-0517-9Nonstationary pearl pulsations as a signature of magnetospheric disturbancesF. Z. Feygin0F. Z. Feygin1F. Z. Feygin2N. G. Kleimenova3O. A. Pokhotelov4M. Parrot5K. Prikner6K. Mursula7J. Kangas8T. Pikkarainen9Institute of Physics of the Earth, Moscow, 123810, Russia<i>Correspondence to:</i> K. Mursulae-mail: kalevi.mursula@oulu.fiInstitute of Physics of the Earth, Moscow, 123810, RussiaInstitute of Physics of the Earth, Moscow, 123810, RussiaLaboratoire de Physique et Chimie de l'Environnement, Centre National de la Recherche Scientifique, Orléans, FranceGeophysical Institute, Czech Academy of Sciences, Prague, Czech RepublicDepartment of Physical Sciences, P.O. Box 3000, FIN-90014 University of Oulu, FinlandSodankylä Geophysical Observatory, FIN-99600 Sodankylä , FinlandDepartment of Physical Sciences, P.O. Box 3000, FIN-90014 University of Oulu, FinlandWe analyse long-lasting (several hours) Pc1 pearl pulsations with decreasing, increasing or constant central frequencies. We show that nonstationary pearl events (those with either decreasing or increasing central frequency) are observed simultaneously with increasing auroral magnetic activity at the nightside magnetosphere while the stationary events (constant central frequency) correspond to quiet magnetic conditions. Events with decreasing central frequency are observed mostly in the late morning and daytime whereas events with increasing central frequency appear either early in the morning or in the afternoon. We explain the diurnal distribution of the nonstationary pearl pulsations in terms of proton drifts depending on magnetic activity, and evaluate the magnetospheric electric field based on the variation of the central frequency of pearl pulsations.<br><br><b>Key words: </b>Magnetospheric physics (magnetospheric configuration and dynamics; plasma waves and instabilities)https://www.ann-geophys.net/18/517/2000/angeo-18-517-2000.pdf |
| spellingShingle | F. Z. Feygin F. Z. Feygin F. Z. Feygin N. G. Kleimenova O. A. Pokhotelov M. Parrot K. Prikner K. Mursula J. Kangas T. Pikkarainen Nonstationary pearl pulsations as a signature of magnetospheric disturbances Annales Geophysicae |
| title | Nonstationary pearl pulsations as a signature of magnetospheric disturbances |
| title_full | Nonstationary pearl pulsations as a signature of magnetospheric disturbances |
| title_fullStr | Nonstationary pearl pulsations as a signature of magnetospheric disturbances |
| title_full_unstemmed | Nonstationary pearl pulsations as a signature of magnetospheric disturbances |
| title_short | Nonstationary pearl pulsations as a signature of magnetospheric disturbances |
| title_sort | nonstationary pearl pulsations as a signature of magnetospheric disturbances |
| url | https://www.ann-geophys.net/18/517/2000/angeo-18-517-2000.pdf |
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