1. RELEC project (Relativistic ELECtrons)

2. Satellites Low altitudes Geostationary Balloons Arctic Antarctic Ionosphere Atmosphere particles Space and balloon studies

3.  Discovery of electron radiation belts onboard ELECTRON satellites in 60’s.  MAXIS (1996) experiment onboard balloons, Kiruna. High-energy electrons >500 keV dropouts: Registered at low altitudes flux - 5 х 10 25 particles for eight days. Total number of trapped electrons – 2 х 10 25. History of the problem

4. 0 6 12 18 24 MLT Probability of microburst 97539753 L The short bursts (~100 ms) of precipitated electrons usually observed at the night-side of trapping boundary. (SAMPEX results).

5. Precipitation of ~100 keV electrons from radiation belts measured in SAMPEX experiment.

6. Objective of the work  The investigation of relativistic electrons precipitation using data of near-polar satellites.  Modeling of acceleration processes and dropout of energetic electrons in process of radial diffusion and interaction with electromagnetic waves in configuration- dynamic magnetosphere.

7. Tasks  Identification of RE events and database on these measurements creation using Coronas-I, Coronas-F, Universitetsky- Tatyana satellites, MIR station data and others.  Analysis and classification of RE using balloon experiments.  Investigation of space-time characteristics of RE events in the problems of magnetospheric activity and magnetosphere configuration.

8. Project features  Joint investigations of RE onboard satellites and registration of gamma (X-rays) in atmosphere.  Registration of RE in wide energy range (up to 10 MeV and more). Time resolution is ~100 ms. Obtaining of spectral and pitch-angle distributions.  Registration of low fluxes of RE using large geometry factor detectors.  Simultaneous registration of RE, X-rays and UV rays from atmosphere.

9. Electrons0.2 – 10 MeV > 10 MeV > 0.3 MeV Protons0.3 – 60 MeV > 50 MeV 3 – 150 MeV >150 MeV Gamma0.05 – 1.0 MeV Neutron0.1 – 30 MeV X-rays10 – 100 keV UV300-400 nm

10. TOTAL RELEC characteristics Mass27 kg. Power36 W. Data flow10-20 Mb/day.

11. Other geophysical and space- physics problems can be solved using the same devices  Lithosphere-ionosphere connections (earthquakes)  Atmosphere-ionosphere connections (thunderstorms) Technical applications  Dosimetry and SEU (single event upsets) problem taking into account neutron component of radiation.

12. Participants PISINP MSU Co-PILebedev PhIAS Radiation measurementSINP MSU (Russia, Ukraine) Low-frequency wavesIKI RAS (Russia, GB, France, Ukraine) High-frequency wavesSRC PAS (Poland, Sweden) DosimetrySINP MSU (Russia, Ukraine, Germany) Ground complex (Balloons)PhIAS (Russia, Germany)

13. Possible ways of cooperation:  Participation in experiment  Coordinated measurements  Data analysis and interpretation