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| Titel |
\begin{center} \textbf{The June 8, 2000 ULF wave activity: a case study.} \end{center} |
| VerfasserIn |
Mirko Piersanti, Umberto Villante, Colin Waters, Igino Coco |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046778
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| Zusammenfassung |
| We examined a train of Pc5 pulsations following the June 8, 2000 SI (UT = 9:15) event,
conducting a comparison between the wave characteristics at geosynchronous orbit (GOES8)
and those on the ground on a global scale in the Northern hemisphere. In the magnetosphere
GOES8 observed a toroidal counterclockwise polarized wave at f=3.3 mHz. Waves at the
same frequency were detected at all ground stations, suggesting an interpretation in terms of a
global oscillation mode of the whole magnetospheric cavity. The latitudinal and Local Time
(LT) dependence of the wave characteristics suggested the occurrence of field line resonance
(FLR) of ground field lines at different latitudes for different LTs. In the nightside, the FLR
occurred at latitude (λ -67Ë ) lower than expected for typical solar wind conditions.
Interestingly, an estimate of the field line eigenfrequency performed by means of the T01
Tsyganenko model (with the modifications introduced by Villante and Piersanti (2008) to
interpret the SI characteristics, i.e. an inner hinging point and a thinner current sheet
thickness of the magnetotail), provided results well consistent with the experimental
observations suggesting magnetotail field lines significantly stretched in antisolar direction. |
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