Properties of Whistler-Mode Waves in Plasmaspheric Plumes

0472429 - ÚFA 2017 US eng A - Abstrakt
Kolmašová, Ivana - Santolík, Ondřej - Darrouzet, F. - Pickett, J. S. - Cornilleau-Wehrlin, N.
Properties of Whistler-Mode Waves in Plasmaspheric Plumes.
ISROSES III: Abstract book. Los Alamos: Los Alamos National Laboratory, 2016. s. 42.
[International Symposium on Recent Observations and Simulations of the Sun–Earth System III (ISROSES III) /3./. 12.09.2016-16.09.2016, Varna]
Institucionální podpora: RVO:68378289
Klíčová slova: whistler mode waves * Cluster spacecraft * plasmasphere * plasmaspheric plumes
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
http://www.isroses.lanl.gov/Abstract_Book_ISROSES.pdf

We analyze occurrence rates and propagation properties of whistler mode waves in plasmaspheric plumes
using systematic observations of the Cluster spacecraft. We use a list of nearly 1000 crossings of plasmaspheric plumes
which has been compiled using the data of the WHISPER instruments from 2001 to 2006. We combine this list with a
database of measurements of the STAFF-SA instruments. Amplitudes of the whistler mode waves in plumes are
investigated in connection with the geomagnetic activity. We found that the integrated VLF amplitudes reach up to 200
pT with median values of 2-40 pT in the plume intervals.
We combine the list of crossings of plasmaspheric plumes with all available measurements of the WBD
instrument. We inspect sixty five plasmaspheric plume crossings which are covered by the WBD data. High-resolution
power spectrograms allow us to classify whistler-mode waves occurring inside the plasmaspheric plumes and analyze
their fine properties. Our results show that strong whistler-mode wave activity below 1 kHz is observed during 98% of
analyzed plume time intervals. Additional frequency bands at higher frequencies (up to 16 kHz, in up to 3 separate
bands) are found in 37% of analyzed spectrograms, whereas discrete emissions can be identified in 32% of cases.
Trvalý link: http://hdl.handle.net/11104/0269738