Empirical modeling of whistler-mode chorus and hiss in the inner magnetosphere using measurements of the Van Allen Probes

0474200 - ÚFA 2018 DE eng A - Abstrakt
Santolík, Ondřej - Hospodarsky, G. B. - Kurth, W. S. - Kletzing, C. A.
Empirical modeling of whistler-mode chorus and hiss in the inner magnetosphere using measurements of the Van Allen Probes.
Geophysical Research Abstracts. Göttingen: European Geosciences Union, 2017. EGU2017-4614. ISSN 1607-7962.
[EGU General Assembly 2017. 23.04.2017-28.04.2017, Vienna]
Institucionální podpora: RVO:68378289
Klíčová slova: whistler mode chorus * plasmaspheric hiss * Van Allen radiation belts * plasmasphere
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
http://meetingorganizer.copernicus.org/EGU2017/EGU2017-4614.pdf

Recent studies of the dynamics of energetic in the Earth radiation belts show that whistler mode chorus and hiss
play an important role. This especially concerns the slot region and the outer Van Allen radiation belts where
empirical wave models are used as a component of existing approaches.
We analyze these whistler-mode waves using a database of survey measurements of the Waves instruments
of the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) onboard the Van
Allen Probes. We use multicomponent data to estimate wave polarization and propagation parameters and to
asses variability of wave amplitudes as a function of position and geomagnetic activity. Four years of Van
Allen Probes EMFISIS Waves survey data give a good orbital coverage in L, latitude, and MLT. Average amplitudes
increase with geomagnetic activity but the observed amplitude variations are still much larger than this effect.
Statistics of planarity and wave vector directions are strongly linked to wave amplitudes. The planarity of
magnetic field polarization is high for strong chorus and its wave normal directions are well defined. We obtain
low planarities of the magnetic field polarization for a substantial fraction of plasmaspheric hiss. This invalidates
the assumption of a single plane wave for these whistler mode emissions.
Trvalý link: http://hdl.handle.net/11104/0271308