Journal article
Observational evidence of the nonlinear wave growth theory of plasmaspheric hiss
Geophysical research letters, Vol.43(19), pp.10,040-10,049
10/16/2016
DOI: 10.1002/2016GL070333
Abstract
We test the recently developed nonlinear wave growth theory of plasmaspheric hiss against discrete rising tone elements of hiss emissions observed by the Van Allen Probes. From the phase variation of the waveforms processed by bandpass filters, we calculate the instantaneous frequencies and wave amplitudes. We obtain the theoretical relation between the wave amplitude and frequency sweep rates at the observation point by applying the convective growth rates and dispersion factors to the known relation at the equator. By plotting the theoretical relation over scatterplots of the wave amplitudes and the frequency sweep rates for rising tone elements, we find good agreement between the hiss observations and the nonlinear theory. We also find that the duration periods of the hiss elements are in good agreement with the nonlinear transition time necessary for the formation of a resonant current through coherent nonlinear wave‐particle interactions.
Key Points
We compare EMFISIS hiss data with the nonlinear wave growth theory
Duration periods of the hiss emissions agree well with the theoretical time scale for nonlinear wave growth
Observed frequency sweep rates are likewise in good agreement with the predicted theoretical rates
Details
- Title: Subtitle
- Observational evidence of the nonlinear wave growth theory of plasmaspheric hiss
- Creators
- Satoko Nakamura - Kyoto UniversityYoshiharu Omura - Kyoto UniversityDanny Summers - Memorial University of NewfoundlandCraig A Kletzing - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.43(19), pp.10,040-10,049
- DOI
- 10.1002/2016GL070333
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Number of pages
- 10
- Grant note
- JSPS KAKENHI (26287120; 15H05815)
- Language
- English
- Date published
- 10/16/2016
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199734202771
Metrics
4 Record Views