An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations
On 2 December 1999, the magnetometer stations in northern Finland registered structured Pc1 activity simultaneously in three distinct frequency bands. Using simultaneous EISCAT radar measurements of the high-latitude ionosphere, we have studied the ionospheric resonator properties during this mul...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2004-01-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/22/643/2004/angeo-22-643-2004.pdf |
| _version_ | 1819243214319648768 |
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| author | K. Prikner K. Mursula J. Kangas R. Kerttula F. Z. Feygin |
| author_facet | K. Prikner K. Mursula J. Kangas R. Kerttula F. Z. Feygin |
| author_sort | K. Prikner |
| collection | DOAJ |
| description | On 2 December 1999, the magnetometer stations in northern Finland registered
structured Pc1 activity simultaneously in three distinct frequency bands. Using simultaneous
EISCAT radar measurements of the high-latitude ionosphere, we have studied the
ionospheric resonator properties during this multiband Pc1 event. The frequencies of the three
structured Pc1 bands were found to closely correspond to the second, third and fourth
harmonic of the calculated fundamental frequency of the ionospheric Alfvén resonator (IAR). In
addition, those frequencies of the three pearl bands that were closest to the exact IAR
harmonics were found to have the strongest intensities. The results demonstrate that the resonator
can have an important role on ground-based Pc1 activity over a notably large frequency
range, favoring transmission of waves with frequencies close to the resonator's
eigenfrequencies. Since the frequencies of all three bands correspond to the maximum rather than
the minimum of the transmission coefficient, the traditional bouncing wave packet model
needs to be revised.<br><br>
<b>Key words.</b> Ionosphere (auroral ionosphere; ionosphere
magnetosphere interactions; wave propagation) |
| first_indexed | 2024-12-23T14:52:08Z |
| format | Article |
| id | doaj.art-4dba599b27494123879b04ef82abafef |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-23T14:52:08Z |
| publishDate | 2004-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-4dba599b27494123879b04ef82abafef2022-12-21T17:42:54ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762004-01-012264365110.5194/angeo-22-643-2004An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsationsK. Prikner0K. Mursula1J. Kangas2R. Kerttula3F. Z. Feygin4Geophysical Institute, Academy of Sciences of the Czech Republic, Bocni II, 14131 Praha 4, Sporilov, Czech RepublicDepartment of Physical Sciences, University of Oulu, P. O. Box 3000, FIN-90014 Oulu, FinlandDepartment of Physical Sciences, University of Oulu, P. O. Box 3000, FIN-90014 Oulu, FinlandDepartment of Physical Sciences, University of Oulu, P. O. Box 3000, FIN-90014 Oulu, FinlandUnited Institute of Physics of the Earth, Russian Academy of Sciences, Bolshaya Gruzinskaya 10, 123810 Moscow, RussiaOn 2 December 1999, the magnetometer stations in northern Finland registered structured Pc1 activity simultaneously in three distinct frequency bands. Using simultaneous EISCAT radar measurements of the high-latitude ionosphere, we have studied the ionospheric resonator properties during this multiband Pc1 event. The frequencies of the three structured Pc1 bands were found to closely correspond to the second, third and fourth harmonic of the calculated fundamental frequency of the ionospheric Alfvén resonator (IAR). In addition, those frequencies of the three pearl bands that were closest to the exact IAR harmonics were found to have the strongest intensities. The results demonstrate that the resonator can have an important role on ground-based Pc1 activity over a notably large frequency range, favoring transmission of waves with frequencies close to the resonator's eigenfrequencies. Since the frequencies of all three bands correspond to the maximum rather than the minimum of the transmission coefficient, the traditional bouncing wave packet model needs to be revised.<br><br> <b>Key words.</b> Ionosphere (auroral ionosphere; ionosphere magnetosphere interactions; wave propagation)https://www.ann-geophys.net/22/643/2004/angeo-22-643-2004.pdf |
| spellingShingle | K. Prikner K. Mursula J. Kangas R. Kerttula F. Z. Feygin An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations Annales Geophysicae |
| title | An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations |
| title_full | An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations |
| title_fullStr | An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations |
| title_full_unstemmed | An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations |
| title_short | An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations |
| title_sort | effect of the ionospheric alfven resonator on multiband pc1 pulsations |
| url | https://www.ann-geophys.net/22/643/2004/angeo-22-643-2004.pdf |
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