The RELEC experiment was specially developed for study of relativistic electrons in near-Earth space together with TLEs in order to test possible connection between these two phenomena. RELEC mission includes x-ray and gamma-ray spectrometer, 3-axis detector for electrons, UV and red-light flash detector, fast optical imager, low-frequency and radio-frequency analyzers of electromagnetic field and waves. Data from RELEC mission will be processed for testing TLE models, studying of TGF light curves and spectra, testing possible connection between electron precipitations and low-frequency electromagnetic waves.

INSTRUMENTATION

DRGE-1 and DRGE-2

Two identical spectometers for x-rays and gammas each containing two independent scintillator phosvich detectors of high temporal resolution and sensitivity
Total effective area: 500 cm~2 (for 100 keV)
Energy range: 10-3000 keV
Time resolution: 15 mcs in event mode

DRGE-3

It is a spectrometer of charged particle containing 3 orthogonally directed complex scintillator detectors
Energy range: 0.1 - 15 MeV (for electrons)
Sensitive area: ~3 cm~2 for each detector

DUV

It is a detector of fast UV and red-light flashes
Time resolution: 0.5 ms in standard mode
Field of view: +- 20 deg
Working dynamic range: from day light to deep night (with different sensitivity)

Low-frequency analyzer (NChA instrument): NChA

Low-frequency analyzer consists of two sensors for measuring of the magnetic field components, two sensors for measuring of the electrical field components and analyzing block

Consists of two orthogonal sensors measuring electromagnetic field, two magnetometers (ferrozond and induction), and a unit of spectral analysis. Sensors are placed on a boom ~ 2m far from the satellite body
Measured parameters:
Electric field:
ULF range: from DC to 100 Hz
VLF range: from 10 Hz to 40 kHz
Magnetic field:
3 components from DC to 40 kHz
Plasma current

Radio-frequency analyzer (RChA instrument)

Physical properties:
Frequency range of the input signals: from 0.05 up to 15 MHz;
Spectral resolution:
10 kHz for frequency from 0.05 up to 1.0 MHz;
100 kHz for frequency from 1.0 up to 15 MHz;
Time resolution: 25 ns;
Dynamical range: 70 dB;
Output data can be collected in spectral or wave-form mode.

Teleccope - T (MTEL-2) // Optical imager based on multi-mirrors

Physical properties:
Spectral range: 300-400 nm;
Spatial resolution: 5km x 5km ;
Vision angle:~11;
Number of PMT channels:
64 for rough image,
64 for detailed one ;
Time resolution: 100 us;
spectral measurements: available
Amplitude range: 10~5