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| Titel |
High-latitude dayside ionosphere response to Pc5 field line resonance |
| VerfasserIn |
F. Pitout, P. Eglitis, P.-L. Blelly |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 21, no. 7 ; Nr. 21, no. 7, S.1509-1520 |
| Datensatznummer |
250014658
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| Publikation (Nr.) |
 copernicus.org/angeo-21-1509-2003.pdf |
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| Zusammenfassung |
We report observations of
pulsations due to Field Line Resonance (FLR) in the morning sector of the
high-latitude dayside ionosphere on 1 February 1998. The Geotail spacecraft,
ideally skimming the dayside magnetopause, monitored the magnetopause motion,
which is seen to induce a modulated response of the ionosphere by means of ULF
waves. Pulsations in the Pc5 frequency range were observed in the ground
magnetic field measured by the IMAGE array, as well as in the electron and ion
temperatures measured by the EISCAT Svalbard Radar. The ion temperature
oscillations are an indicator of a modulated convection electric field while
field-aligned currents (FAC) associated with the FLR control the electron
temperature. We have performed a simulation of the ionosphere experiencing
sinusoidal FAC and electric field in order to confirm our hypothesis. In
addition to the ionospheric response, the possible cause of the FLR and
processes involved are also discussed.
Key words. Magnetospheric physics (MHD
waves and instabilities; magnetosphere-ionosphere interactions) – Ionosphere
(polar ionosphere) |
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