Pitch angle distribution of trapped energetic protons and helium isotope nuclei measured along the Resurs-01 No. 4 LEO satellite
- 1Center for Space Radiations (CSR); Chemin du Cyclotron 2, 1348 Louvain-la-Neuve, Belgium
- 2Moscow Engineering PHysics Institute (MEPHI), state university; Kashirskoe shosse 31, 115409 Moscow, Russia
- 3Istituto Nazionale di Fisica Nucleare sezione di Roma2, University of Rome “Tor Vergata", I-00133 Rome, Italy
- 4Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Via Enrico Fermi 40, I-00044 Frascati, Italy
Abstract. The NINA detector on board the Resurs-01 No. 4 satellite (835 km, 98° inclination) is equipped with particle trackers based on silicon strip detectors. From the energy deposited in each of its silicon layers the mass, the momentum direction and energy of incident particles have been determined. The resolutions in mass and energy allow identification of H and He isotopes over the 10-50 MeV/n energy range. The angular resolution is about 2.5°. We present the direct measurements of proton and helium isotopes pitch angle distributions derived from Resurs-01 No.4/NINA observations and their variations as functions of (B, L) coordinates and energy. The measurements of trapped helium isotopes spectrum are also presented.