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| Titel |
ULF wave power features in the topside ionosphere revealed by Swarm observations |
| VerfasserIn |
Constantinos Papadimitriou, Georgios Balasis, Ioannis A. Daglis, Omiros Giannakis |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250131264
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| Publikation (Nr.) |
 EGU/EGU2016-11654.pdf |
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| Zusammenfassung |
| Recently developed automated methods for detecting and deriving the
characteristics of ultra low frequency (ULF) waves are applied to the
Swarm data sets in order to retrieve new information about the near-Earth
electromagnetic environment. Here, we present the first ULF wave
observations by Swarm, by performing a statistical study on the occurence
and properties of Pc3 waves (20–100 mHz) for a time period spanning two
years. We derive distributions for various properties of the detected wave
events (amplitude, peak frequency, duration, bandwidth) and examine
evidence for the decay of the amplitude of the Pc3 signal with altitude,
as predicted by theoretical models of wave propagation. We show that the
major characteristics of the Swarm ULF power maps generally agree between
observations made by the upper satellite and the lower pair of satellites,
when the power spectrum of the upper satellite is shifted in local time,
to account for the angular separation between their orbital planes.
Moreover, a puzzling enhancement, not predicted by current ULF wave
theories, of compressional Pc3 wave energy was revealed by Swarm in the
region of the South Atlantic Anomaly. |
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