Spatial and temporal variability of whistler mode emissions in the Earth’s inner magnetosphere

0497709 - ÚFA 2019 BE eng A - Abstract
Santolík, Ondřej
Spatial and temporal variability of whistler mode emissions in the Earth’s inner magnetosphere.
2 nd URSI AT-RASC Proceedings. Gent: URSI, 2018.
[URSI Atlantic Radio Science Meeting (AT-RASC) /2./. 28.05.2018-01.06.2018, Gran Canaria]
Institutional support: RVO:68378289
Keywords : magnetosphere * plasmasphere * Van Allen radiation belt * whistler mode waves
OECD category: Fluids and plasma physics (including surface physics)
http://www.ursi.org/proceedings/procAT18/papers/SH0114.pdf

Electromagnetic whistler-mode emissions are important components of the puzzle of the dynamic behavior of
the outer Van Allen radiation belt and the slot region. Survey data of the Waves instrument from the Electric
and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) onboard the Van Allen Probes are
recorded with a nearly 100 % coverage. We use more than 5 years of these measurements to investigate
statistical properties of wave power which directly influences results of quasilinear diffusion models.
Previous results have shown that average wave power inside the plasmasphere has a flat peak at a MLT between
8 h and 17 h and L values between 2 and 4 and that it increases with geomagnetic activity. Our results indicate
that random variations of wave power are still larger or comparable to the effects of these systematic trends.
Power variations from simultaneous spatially separated measurements are dominated by separations in MLT at
scales below 30 min, with a weaker influence of separations in L or magnetic latitude. Measurements which
were done at close points in space show temporal variations at time scales of tens of minutes.
Permanent Link: http://hdl.handle.net/11104/0290218