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Ann. Geophys., 23, 2983-2987, 2005
www.ann-geophys.net/23/2983/2005/
© European Geosciences Union 2005
Pitch angle distribution of trapped energetic protons and helium isotope nuclei measured along the Resurs-01 No. 4 LEO satellite
A. Leonov1,2, M. Cyamukungu1, J. Cabrera1, P. Leleux1, J. Lemaire1, G. Gregorie1, S. Benck1, V. Mikhailov2, A. Bakaldin2, A. Galper2, S. Koldashov2, S. Voronov2, M. Casolino3, M. De Pascale3, P. Picozza3, R. Sparvolli3, and M. Ricci4
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.
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