Speaker
Ivana Kolmasova
(IAP AS CR Prague)
Description
The instrument ELMAVAN is being prepared at the Institute of Atmospheric Physics, Prague for the Russian Resonance project with international participation, currently scheduled to be launched in 2015. The aim of this four-spacecraft mission is to investigate properties of wave-particle interactions and plasma dynamics in the inner magnetosphere of the Earth with the focus on phenomena occurring within the same flux tube of the Earth's magnetic field. The wave emissions attract increasing attention because of their influence on the dynamics of the Earth’s radiation belts. The Resonance project therefore represents an excellent opportunity for the magnetospheric research, and together with the recently launched two-spacecraft US mission Van Allen Probes, it will contribute to our understanding of the Earth’s Van Allen radiation belts and the inner magnetosphere.
ELMAVAN will measure intensity, polarization, coherence, and propagation properties of waves in magnetospheric plasmas. Three orthogonal magnetic search coil antennas and four electric monopoles will be used for the measurements. The instrument will measure fluctuations of the electric and magnetic field in the frequency range 10 Hz - 20 kHz. The scientific motivation is to investigate properties of whistler-mode chorus and hiss emissions, equatorial emissions. Nonlinear wave-particle interactions will be the main target of these measurements. The input signals of ELMAVAN will consist of 3 analog signals from orthogonal magnetic search coil antennas (with a sensitivity better than 10 fT /√Hz at f > 1kHz, max. amplitude 10 nT at f > 100 Hz) and 4 analog signals from electric monopoles (sensitivity 0.1 μV/m /√Hz, max. amplitude 1.2 V/m at f>100 Hz).
Databases of VLF measurements from previous spacecraft projects are necessary for a correct definition of characteristics of these future measurements. Experience gained from analysis of existing spacecraft data is also crucial for the design of the onboard algorithms which are implemented in the ELMAVAN analyzer. We especially use the data from the STAFF-SA and WBD instruments onboard the Cluster mission. The work on collection and analysis of these databases receives EU support through the FP7-Space grant agreement no 284520 for the MAARBLE collaborative research project.
Primary author
Ivana Kolmasova
(IAP AS CR Prague)
Co-authors
Dr
Boycho Boychev
(SRT Institute Sofia)
Dr
Dmitryi Chugunin
(SRI Moscow)
Mr
Ludek Uhlír
(IAP Prague)
Dr
Ondrej Santolik
(IAP Prague & Charles University in Prague)
Mr
Radek Lan
(IAP Prague)
Dr
Valery Korepanov
(Lviv Centre of ISR NAS-NSA Lviv)
Dr
Vira Pronenko
(Lviv Centre of ISR NAS-NSA Lviv)
