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| Titel |
Letter to the editor: The ionospheric response during an interval of Pc5 ULF wave activity |
| VerfasserIn |
Mark Lester, J. A. Davies, T. K. Yeoman |
| 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 ; 18, no. 2 ; Nr. 18, no. 2, S.257-261 |
| Datensatznummer |
250013915
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| Publikation (Nr.) |
 copernicus.org/angeo-18-257-2000.pdf |
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| Zusammenfassung |
A preliminary analysis of Pc5, ULF wave
activity observed with the IMAGE magnetometer array and the EISCAT UHF radar in
the post midnight sector indicates that such waves can be caused by the
modulation of the ionospheric conductivity as well as the wave electric field.
An observed Pc5 pulsation is divided into three separate intervals based upon
the EISCAT data. In the first and third, the Pc5 waves are observed only in the
measured electron density between 90 and 112 km and maxima in the electron
density at these altitudes are attributed to pulsed precipitation of electrons
with energies up to 40 keV which result in the height integrated Hall
conductivity being pulsed between 10 and 50 S. In the second interval, the Pc5
wave is observed in the F-region ion temperature, electron density and electron
temperature but not in the D and E region electron densities. The analysis
suggests that the wave during this interval is a coupled Alfven and
compressional mode.
Key words: Ionosphere (electric fields and currents) -
Magnetospheric physics (magnetosphere-ionosphere interaction; MHD waves and
instabilities) |
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