Variability of natural whistler-mode emissions in the inner magnetosphere

0542702 - ÚFA 2022 DE eng A - Abstract
Santolík, Ondřej - Kurth, W. S. - Kletzing, C. A.
Variability of natural whistler-mode emissions in the inner magnetosphere.
EGU General Assembly 2021 (vEGU21: Gather Online). Göttingen: European Geosciences Union, 2021.
[EGU General Assembly Conference 2021. 19.04.2021-30.04.2021, online]
Institutional support: RVO:68378289
Keywords : inner magnetosphere * whistler-mode electromagnetic waves * Van Allen Probes * EMFISIS
OECD category: Fluids and plasma physics (including surface physics)
https://meetingorganizer.copernicus.org/EGU21/EGU21-10735.html

Whistler-mode electromagnetic waves, especially natural emissions of chorus and hiss, have been
shown to transfer energy between different electron populations in the inner magnetosphere via
quasi-linear or nonlinear wave particle interactions. Average or median intensities of chorus and
hiss emissions have been found to increase with increasing levels of geomagnetic activity but their
stochastic variations in individual spacecraft measurements at the same location are usually
comparable to these large-scale temporal effects. Statistical properties of variations of wave
power directly influence results of quasi-linear diffusion models.
We use the survey measurements of the Waves instruments of the Electric and Magnetic Field
Instrument Suite and Integrated Science (EMFISIS) onboard two Van Allen Probes to asses the
probability distribution function of these stochastic variations. We take advantage of the entire
data set of these measurements with a nearly 100% coverage from August 31, 2012 till October 13,
2019 (2600 days) for spacecraft A, and from September 1, 2012 till July 16, 2019 (2510 days) for
spacecraft B.

Permanent Link: http://hdl.handle.net/11104/0320074