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| Titel |
Longitudinal dependence of VLF electromagnetic emissions observed by the Van Allen Probes and the DEMETER spacecraft |
| VerfasserIn |
Jan Zahlava, Frantisek Nemec, Ondrej Santolik, Ivana Kolmasova, George B. Hospodarsky, Michel Parrot, William S. Kurth, Craig Kletzing |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250139952
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| Publikation (Nr.) |
 EGU/EGU2017-3274.pdf |
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| Zusammenfassung |
| We use electromagnetic wave data obtained by the Van Allen Probes (2012–2016) to
investigate longitudinal dependencies of average wave intensities in the very low frequency
range. We calculate the dependencies for various frequency bands and magnetic local times.
The main interest is to analyze the local time intervals about 10:30 LT and 22:30 LT in order
to enable a comparison with the measurements performed by the DEMETER spacecraft
(2004–2010) at low altitudes (≈ 700 km). Additional wave parameters which are
available in the Van Allen Probes data set, e.g. directions of the wave propagation, are
also considered. We attempt to evaluate the contribution of the lightning-generated
whistlers to the overall wave intensity. The main idea of the performed analysis is that
emissions generated in the magnetosphere should not depend on the geomagnetic
longitude, i.e., any observed longitudinal dependence of the wave intensity should be of
the terrestrial origin and possibly linkable to the lightning activity. The obtained
results may have a potential impact on identifying the source of plasmaspheric hiss. |
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