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| Titel |
Properties and Periodicities of Reconnection Events in the Jovian Magnetotail |
| VerfasserIn |
Marissa Vogt, Margaret Kivelson, Krishan Khurana, Steven Joy, Raymond Walker |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250037652
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| Zusammenfassung |
| Dynamics at Jupiter, including flow bursts, reconfiguration events, and auroral polar dawn
spots, have been observed to occur with a 2-3 day periodicity. Is this periodicity always
present? Is the 2-3 day timescale characteristic of internal processes driving reconnection in
the Jovian magnetotail? To address these questions we have searched for a statistically
significant periodicity in reconnection events identified in magnetometer data from the Jovian
magnetotail. These events were identified with a set of quantitative criteria requiring an
increase to Bθ, the north-south component of the magnetic field, over background levels. We
will summarize the properties of our reconnection events, including their location and
frequency and the likely location of a reconnection x-line. We have also examined our events
for evidence of statistically significant periodic signals by using the Rayleigh power
spectrum, which can be used to determine whether a statistically significant periodic signal is
present among the occurrence times of discrete events. The 2-3 day recurrence period is
visually evident in our events for specific intervals or orbits, and in some cases the Rayleigh
power spectrum also peaks for periods between 2 and 3 days. However, we will
show that there is no statistically significant periodicity at the 2-3 day time scale in
the complete Galileo dataset. The 2-3 day periodicity is therefore not a dominant
characteristic of internal processes driving reconnection in the Jovian magnetotail. |
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